{"id":1004,"date":"2026-10-18T13:26:55","date_gmt":"2026-10-18T13:26:55","guid":{"rendered":"https:\/\/bmicalculatornhs.co.uk\/?page_id=1004"},"modified":"2026-11-12T16:42:49","modified_gmt":"2026-11-12T16:42:49","slug":"child-growth-chart-calculator-uk","status":"publish","type":"page","link":"https:\/\/bmicalculatornhs.co.uk\/blog\/child-growth-chart-calculator-uk\/","title":{"rendered":"Child Growth Chart Calculator UK | Centile &#038; Percentile"},"content":{"rendered":"<p><main id=\"main\" class=\"page-wrap\"><\/p>\n<div class=\"two-col\">\n<div>\n      <!-- \u2550\u2550\u2550 TOOL \u2550\u2550\u2550 --><\/p>\n<section id=\"tool\" aria-label=\"Child growth chart calculator\">\n<div class=\"calc-card\">\n<div class=\"calc-body\">\n<p>            <!-- Sex buttons --><\/p>\n<div class=\"form-group\">\n              <label class=\"form-label\" id=\"sex-lbl\">Child&#8217;s sex <span class=\"req\" aria-hidden=\"true\">*<\/span><\/label><\/p>\n<div class=\"gender-btns\" role=\"radiogroup\" aria-labelledby=\"sex-lbl\">\n                <button type=\"button\" class=\"gender-btn active\" data-sex=\"boy\" role=\"radio\" aria-checked=\"true\">\u2642 Boy<\/button><br \/>\n                <button type=\"button\" class=\"gender-btn\" data-sex=\"girl\" role=\"radio\" aria-checked=\"false\">\u2640 Girl<\/button>\n              <\/div>\n<\/p><\/div>\n<p>            <!-- Age --><\/p>\n<div class=\"form-group\">\n              <label class=\"form-label\" for=\"age-val\">Age <span class=\"req\" aria-hidden=\"true\">*<\/span><br \/>\n                <span class=\"hint\">For newborns and infants, use weeks. For toddlers and older children, use months (covers up to 18 years).<\/span><br \/>\n              <\/label><\/p>\n<div class=\"input-row\">\n                <input type=\"number\" id=\"age-val\" class=\"form-control\" placeholder=\"e.g. 18\" min=\"0\" step=\"0.1\" aria-describedby=\"age-err\"><br \/>\n                <select id=\"age-unit\" class=\"form-control\" aria-label=\"Age unit\"><option value=\"months\" selected>Months<\/option><option value=\"weeks\">Weeks<\/option><option value=\"years\">Years<\/option><\/select>\n              <\/div>\n<div class=\"err\" id=\"age-err\">Please enter a valid age. Use weeks for under-2 (0\u201396), months for 0\u201318 years.<\/div>\n<\/p><\/div>\n<p>            <!-- Unit toggle --><\/p>\n<div class=\"form-group\">\n              <label class=\"form-label\">Measurement units<\/label><\/p>\n<div class=\"unit-toggle\" role=\"tablist\" aria-label=\"Unit system\">\n                <button class=\"unit-btn active\" data-unit=\"metric\" type=\"button\" role=\"tab\" aria-selected=\"true\">Metric (cm \/ kg)<\/button><br \/>\n                <button class=\"unit-btn\" data-unit=\"imperial\" type=\"button\" role=\"tab\" aria-selected=\"false\">Imperial (in \/ lb)<\/button>\n              <\/div>\n<\/p><\/div>\n<p>            <!-- Metric --><\/p>\n<div id=\"metric-group\">\n<div class=\"mini-row\">\n<div>\n                  <label class=\"form-label\" for=\"h-cm\">Height \/ length <span class=\"opt\">(cm)<\/span><\/label><br \/>\n                  <input type=\"number\" id=\"h-cm\" class=\"form-control\" placeholder=\"e.g. 82.5\" min=\"40\" max=\"220\" step=\"0.1\" aria-describedby=\"h-cm-err\"><\/p>\n<div class=\"err\" id=\"h-cm-err\">Please enter a realistic height for a child (40\u2013220 cm).<\/div>\n<\/p><\/div>\n<div>\n                  <label class=\"form-label\" for=\"w-kg\">Weight <span class=\"opt\">(kg)<\/span><\/label><br \/>\n                  <input type=\"number\" id=\"w-kg\" class=\"form-control\" placeholder=\"e.g. 11.2\" min=\"0.5\" max=\"180\" step=\"0.01\" aria-describedby=\"w-kg-err\"><\/p>\n<div class=\"err\" id=\"w-kg-err\">Please enter a weight between 0.5 and 180 kg.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"form-group\" style=\"margin-top:14px\">\n                <label class=\"form-label\" for=\"hc-cm\">Head circumference <span class=\"opt\">(cm, optional)<\/span><\/label><br \/>\n                <input type=\"number\" id=\"hc-cm\" class=\"form-control\" placeholder=\"e.g. 47\" min=\"30\" max=\"65\" step=\"0.1\" aria-describedby=\"hc-cm-err\"><\/p>\n<div class=\"err\" id=\"hc-cm-err\">Head circumference should be 30\u201365 cm.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p>            <!-- Imperial --><\/p>\n<div id=\"imperial-group\" style=\"display:none\">\n<div class=\"mini-row\">\n<div>\n                  <label class=\"form-label\" for=\"h-in\">Height \/ length <span class=\"opt\">(in)<\/span><\/label><br \/>\n                  <input type=\"number\" id=\"h-in\" class=\"form-control\" placeholder=\"e.g. 32.5\" min=\"14\" max=\"86\" step=\"0.1\" aria-describedby=\"h-in-err\"><\/p>\n<div class=\"err\" id=\"h-in-err\">Please enter a realistic height for a child (14\u201386 in).<\/div>\n<\/p><\/div>\n<div>\n                  <label class=\"form-label\" for=\"w-lb\">Weight <span class=\"opt\">(lb)<\/span><\/label><br \/>\n                  <input type=\"number\" id=\"w-lb\" class=\"form-control\" placeholder=\"e.g. 24.7\" min=\"1\" max=\"400\" step=\"0.1\" aria-describedby=\"w-lb-err\"><\/p>\n<div class=\"err\" id=\"w-lb-err\">Please enter a weight between 1 and 400 lb.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"form-group\" style=\"margin-top:14px\">\n                <label class=\"form-label\" for=\"hc-in\">Head circumference <span class=\"opt\">(in, optional)<\/span><\/label><br \/>\n                <input type=\"number\" id=\"hc-in\" class=\"form-control\" placeholder=\"e.g. 18.5\" min=\"11\" max=\"26\" step=\"0.1\" aria-describedby=\"hc-in-err\"><\/p>\n<div class=\"err\" id=\"hc-in-err\">Head circumference should be 11\u201326 inches.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"form-group\">\n              <label class=\"form-label\" for=\"prem\">Premature \/ corrected age <span class=\"opt\">(optional)<\/span><\/label><br \/>\n              <select id=\"prem\" class=\"form-control\" aria-label=\"Premature \/ corrected age\"><option value=\"term\">Born at term (37+ weeks)<\/option><option value=\"preterm\">Born preterm (under 37 weeks) \u2014 using corrected age<\/option><\/select>\n            <\/div>\n<p>            <button class=\"btn-calc\" id=\"calcBtn\" type=\"button\"><br \/>\n              <span aria-hidden=\"true\">\ud83d\udcca<\/span> Calculate UK Centile<br \/>\n            <\/button><\/p>\n<div class=\"btn-row\">\n              <button class=\"btn-mini\" id=\"resetBtn\" type=\"button\">\u21ba Reset<\/button><br \/>\n              <button class=\"btn-mini\" id=\"copyBtn\" type=\"button\">\ud83d\udccb Copy<\/button><\/p>\n<p>              <button class=\"btn-mini\" id=\"printBtn\" type=\"button\">\ud83d\udda8 Print<\/button>\n            <\/div>\n<p>            <!-- RESULTS --><\/p>\n<div id=\"results\" aria-live=\"polite\">\n<p>              <!-- Main centile card --><\/p>\n<div class=\"result-card\">\n<div class=\"rc-head\">\n                  <span class=\"rc-lbl\">Weight Centile<\/span><br \/>\n                  <span class=\"rc-name\" id=\"ageDisp\">\u2014<\/span>\n                <\/div>\n<div class=\"rc-centile\" id=\"cWeight\">\u2014<small>th centile<\/small><\/div>\n<div class=\"rc-tag\" id=\"cWeightTag\">Average<\/div>\n<\/p><\/div>\n<p>              <!-- Visual chart --><\/p>\n<div class=\"centile-chart\" aria-label=\"UK-WHO weight centile chart\">\n<div class=\"cc-title\" id=\"chartTitle\">UK Growth Chart \u2014 Weight<\/div>\n<p>                <svg class=\"cc-svg\" id=\"ccSvg\" viewbox=\"0 0 320 180\" preserveaspectratio=\"xMidYMid meet\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\"><\/svg><\/p>\n<div class=\"trend-labels\" aria-label=\"Centile scale\">\n                  <span>0.4th<\/span><span>9th<\/span><span>25th<\/span><span>50th<\/span><span>75th<\/span><span>91st<\/span><span>99.6th<\/span>\n                <\/div>\n<\/p><\/div>\n<div class=\"centile-grid\">\n<div class=\"c-cell\">\n<div class=\"cc-lbl\">Height centile<\/div>\n<div class=\"cc-val\" id=\"cHeight\">\u2014<\/div>\n<div class=\"cc-extra\">For age &amp; sex (UK-WHO)<\/div>\n<\/p><\/div>\n<div class=\"c-cell\">\n<div class=\"cc-lbl\">BMI centile<\/div>\n<div class=\"cc-val\" id=\"cBMI\">\u2014<\/div>\n<div class=\"cc-extra\">Overweight \u2265 91st \u00b7 obese \u2265 98th<\/div>\n<\/p><\/div>\n<div class=\"c-cell\">\n<div class=\"cc-lbl\">Head circumference<\/div>\n<div class=\"cc-val\" id=\"cHC\">\u2014<\/div>\n<div class=\"cc-extra\" id=\"cHCExtra\">If provided (0\u20133 years)<\/div>\n<\/p><\/div>\n<div class=\"c-cell\">\n<div class=\"cc-lbl\">Reference used<\/div>\n<div class=\"cc-val\" id=\"cRef\">UK-WHO 0\u20134<\/div>\n<div class=\"cc-extra\">Switches to UK90 above 4y<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p>              <!-- Interpretation --><\/p>\n<div class=\"interp-card\">\n<h4 id=\"interpTitle\">What does this centile mean?<\/h4>\n<p id=\"interpText\">Your child&#8217;s weight plots within the typical UK range. UK growth charts use centiles that show where a child sits relative to 100 other children of the same age and sex. The chart you&#8217;re using is the same one used by NHS health visitors and GPs.<\/p>\n<\/p><\/div>\n<p>              <!-- Action list --><\/p>\n<div class=\"interp-card\" style=\"background:#fff;border-left-color:var(--nhs-green)\">\n<h4 style=\"color:var(--nhs-green)\">Recommended next steps<\/h4>\n<ul class=\"action-list\" id=\"actionList\">\n<li>Plot this measurement in your child&#8217;s Personal Child Health Record (red book).<\/li>\n<li>Share the trend with your health visitor at the next scheduled review.<\/li>\n<li>Focus on healthy growth across a period, not a single measurement.<\/li>\n<\/ul><\/div>\n<div class=\"warning-strip\">\u26a0\ufe0f <strong>Important:<\/strong> Any centile between the 2nd and 98th is statistically healthy. Trends over time \u2014 not single measurements \u2014 are what matter. Speak to your health visitor or GP if your child has dropped or risen across two or more centile spaces.<\/div>\n<div class=\"ref-strip\"><strong>Reference data:<\/strong> WHO Child Growth Standards (0\u20134 y) blended with UK90 reference at age 4 y, per RCPCH UK-WHO chart specification. This page is an educational tool, not the RCPCH Digital Growth Chart.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p>      <!-- \u2550\u2550\u2550 KEY TAKEAWAYS \u2550\u2550\u2550 --><\/p>\n<section class=\"article\" aria-label=\"Article content\">\n<div class=\"key-takeaways\">\n<h3>\ud83d\udccc Key Takeaways<\/h3>\n<ul>\n<li>The NHS uses the <strong>UK-WHO growth chart (0\u20134 years)<\/strong> and the <strong>UK90 reference chart (4\u201318 years)<\/strong> for centile plotting in the UK.<\/li>\n<li>A <strong>child growth chart calculator UK NHS<\/strong> plots your child&#8217;s weight, height, BMI and head circumference on these charts and returns an approximate <strong>centile (percentile)<\/strong>.<\/li>\n<li>Healthy growth is most reliably judged by <strong>trend across time<\/strong>, not by a single measurement.<\/li>\n<li>Any centile between the 2nd and 98th is statistically within the healthy range.<\/li>\n<li>All maths runs in your browser \u2014 no data is sent, stored or transmitted.<\/li>\n<\/ul><\/div>\n<h2>Introduction \u2014 What Is a Child Growth Chart Calculator UK NHS?<\/h2>\n<p>A <strong>child growth chart calculator UK NHS<\/strong> is an interactive tool that places a child&#8217;s measurements \u2014 weight, height or length, head circumference and BMI \u2014 on the official UK growth charts and reports back an approximate <strong>centile (or percentile)<\/strong> for the child&#8217;s age and sex. The NHS uses the same charts through health visitors, GPs, school nurses and the National Child Measurement Programme (NCMP). Parents can plot their red book measurements in seconds with this calculator.<\/p>\n<p>UK health practice uses the term <em>centile<\/em> as the standard word \u2014 although <em>percentile<\/em> is a common synonym in everyday use. Both mean the same thing: the percentage of children of the same age and sex whose measurement is less than the child&#8217;s. A baby on the 25th weight centile weighs more than 25 of every 100 babies of the same age and sex, and less than 75.<\/p>\n<p>The calculator below is calibrated against the same UK-WHO and UK90 reference data used by the NHS. For sibling calculators also used at home, see our standard <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a>, our <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/baby-weight-percentile-calculator-uk.html\">baby weight percentile calculator UK<\/a>, and the broader <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/percentile-calculator-uk.html\">percentile calculator UK<\/a>. For an in-depth read on how centiles work, see the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-growth-percentiles-explained.html\">child growth percentiles explained<\/a> guide.<\/p>\n<div class=\"definition-box\">\n<h4>\ud83d\udcd6 Quick Definition<\/h4>\n<p><strong>Centile (percentile)<\/strong> \u2014 a point on a scale of 100 that shows where a measurement sits compared to other children of the same age and sex. The 50th centile is the median; the 9th, 25th, 75th, 91st and 98th centiles are the reference points most commonly plotted on UK growth charts.<\/p>\n<\/p><\/div>\n<h2>How to Use the Growth Chart Calculator<\/h2>\n<p>The free <strong>child growth chart calculator UK NHS<\/strong> takes four inputs and instantly returns an estimated centile for each available measurement. The whole flow runs in your browser.<\/p>\n<h3>Step 1 \u2014 Choose the child&#8217;s sex<\/h3>\n<p>Tap <strong>Boy<\/strong> or <strong>Girl<\/strong>. Boys and girls grow at slightly different rates from birth, so the UK growth charts are drawn separately for each sex. Picking the wrong sex produces inaccurate centiles.<\/p>\n<h3>Step 2 \u2014 Enter the age<\/h3>\n<p>Type the age and pick its unit. <strong>Weeks<\/strong> are most useful for newborns and infants under 2. <strong>Months<\/strong> work for any age 0\u201318. <strong>Years<\/strong> are a quick entry for school-age children. For babies born preterm (under 37 weeks), NHS practice uses <em>corrected age<\/em> until age 2 \u2014 select the preterm option on the calculator to apply this.<\/p>\n<h3>Step 3 \u2014 Enter the measurements<\/h3>\n<p>Fill in weight, height (or length for under-2s lying down) and the optional head circumference. Decimal entries are fine. Toggle between metric (cm \/ kg) and imperial (in \/ lb) for the unit system you have to hand \u2014 the calculator converts internally.<\/p>\n<h3>Step 4 \u2014 Click Calculate UK Centile<\/h3>\n<p>The result card shows your child&#8217;s approximate centiles for weight, height, BMI and head circumference, alongside a small visual chart plot showing where the result sits on the UK growth chart between the 0.4th and 99.6th reference centiles.<\/p>\n<h3>Step 5 \u2014 Reset, copy, share or print<\/h3>\n<p>The four helper buttons let you clear the form, copy a summary record for the red book, share the URL, or print a clean copy for a GP or health visitor visit.<\/p>\n<h2>What Growth Charts Does the NHS Use?<\/h2>\n<p>The NHS uses two reference datasets, sometimes blended together into a single centile chart. The Royal College of Paediatrics and Child Health (RCPCH) is the official publisher.<\/p>\n<table class=\"ctable\">\n<thead>\n<tr>\n<th>Age range<\/th>\n<th>Official chart<\/th>\n<th>Source data<\/th>\n<th>Introduced<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Birth to 4 years<\/td>\n<td>UK-WHO growth chart<\/td>\n<td>WHO Child Growth Standards + UK birth data (preterm + term)<\/td>\n<td>NHS-wide from May 2009 in England<\/td>\n<\/tr>\n<tr>\n<td>4 to 18 years<\/td>\n<td>UK90 reference chart<\/td>\n<td>British 1990 growth reference dataset (UK90)<\/td>\n<td>Continuity with 1990 dataset at age 4<\/td>\n<\/tr>\n<tr>\n<td>2 to 18 years (BMI)<\/td>\n<td>UK-WHO \/ UK90 BMI chart<\/td>\n<td>Same \u2014 published RCPCH<\/td>\n<td>Replaces older Cole dataset in UK practice<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The <strong>UK-WHO growth chart<\/strong> draws on the WHO Child Growth Standards \u2014 describing how children <em>should<\/em> grow under optimal conditions (largely breastfed, healthy environment). The 0\u20134 part of the UK chart blends these standards with UK birth data to reflect the actual birth size of UK babies and the real preterm-to-term trajectory. From age 4 the chart transitions to the UK90 reference, which describes how a UK child population grew in 1990.<\/p>\n<p>Both charts are derived using the LMS method (Cole, 1990). L converts the data into a normal distribution, M is the median and S the spread (coefficient of variation). Centiles are then calculated with the formula <strong>Z = [(X\/M)^L \u2212 1] \/ (L \u00d7 S)<\/strong> and the centile is the percent point function of the standard normal.<\/p>\n<h2>The Centile Method Explained<\/h2>\n<p>A centile isn&#8217;t a mark of failure or success \u2014 it lists where a measurement sits within a normal UK child distribution. Taking a measurement once tells you only one thing; plotting it across multiple reviews tells you whether the growth pattern is healthy. That is why the NHS growth chart is always plotted over time, never read at a single point.<\/p>\n<div class=\"definition-box\">\n<h4>How a centile is calculated (LMS method)<\/h4>\n<p><strong>Z = [(X \/ M)^L \u2212 1] \/ (L \u00d7 S)<\/strong><br \/>\n          Where X is the child&#8217;s measurement, M the reference median, L the Box-Cox power and S the coefficient of variation for the same age and sex. The centile is then read from the standard normal distribution table.<\/p>\n<\/p><\/div>\n<p>Our calculator uses a simplified lookup table built from published UK-WHO and UK90 reference median and SD values for the most common age points, then interpolates between them. For a clinical-grade centile with full LMS parameters across every age in days, the RCPCH Digital Growth Chart is the canonical tool.<\/p>\n<h2>Healthy Centile Ranges \u2014 Reference Table UK<\/h2>\n<p>The most commonly drawn UK centile lines are the 0.4th, 2nd, 9th, 25th, 50th, 75th, 91st, 98th and 99.6th. The NHS considers any centile between the 2nd and 98th as statistically healthy.<\/p>\n<table class=\"ctable\">\n<thead>\n<tr>\n<th>UK centile line<\/th>\n<th>Equivalent Z-score<\/th>\n<th>NHS interpretation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0.4th<\/td>\n<td>\u22122.67<\/td>\n<td>Below normal range \u2014 clinical assessment<\/td>\n<\/tr>\n<tr>\n<td>2nd<\/td>\n<td>\u22122.00<\/td>\n<td>World Health Organization lower normal limit<\/td>\n<\/tr>\n<tr>\n<td>9th<\/td>\n<td>\u22121.33<\/td>\n<td>Lower tracker \u2014 still within normal range<\/td>\n<\/tr>\n<tr>\n<td>25th<\/td>\n<td>\u22120.67<\/td>\n<td>Lower typical range<\/td>\n<\/tr>\n<tr>\n<td>50th<\/td>\n<td>0.00<\/td>\n<td>Median reference line<\/td>\n<\/tr>\n<tr>\n<td>75th<\/td>\n<td>+0.67<\/td>\n<td>Upper typical range<\/td>\n<\/tr>\n<tr>\n<td>91st<\/td>\n<td>+1.33<\/td>\n<td>Upper tracker \u2014 BMI \u2265 91st = NHS overweight threshold<\/td>\n<\/tr>\n<tr>\n<td>98th<\/td>\n<td>+2.00<\/td>\n<td>Upper normal limit \u2014 BMI \u2265 98th = NHS obese threshold<\/td>\n<\/tr>\n<tr>\n<td>99.6th<\/td>\n<td>+2.67<\/td>\n<td>Above normal range \u2014 clinical assessment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The BMI centile thresholds are particularly useful for under-18s: a BMI above the 91st centile places a child in the NHS <em>overweight<\/em> category, above the 98th in the <em>obese<\/em> category, and below the 2nd in the <em>underweight<\/em> category. The standard adult NHS BMI thresholds (18.5 \/ 25 \/ 30) do <em>not<\/em> apply to children.<\/p>\n<h2>Worked Examples \u2014 Reading the Centile Chart<\/h2>\n<h3>Example 1 \u2014 A 12-month-old boy<\/h3>\n<p><strong>Inputs:<\/strong> Boy, 12 months, 10.0 kg, 76 cm. <strong>Reference:<\/strong> UK-WHO 0\u20134 chart. <strong>Result:<\/strong> Weight ~50th centile (median for healthy term 12-month-old boys), height ~50th. Head circumference was provided at 47 cm \u2014 sits on the 50th centile. Healthy typical growth across all measurements.<\/p>\n<h3>Example 2 \u2014 A 2-year-old girl<\/h3>\n<p><strong>Inputs:<\/strong> Girl, 24 months, 12.6 kg, 87 cm. <strong>Reference:<\/strong> UK-WHO 0\u20134 chart. <strong>Result:<\/strong> Weight ~75th centile, height ~91st centile. Both measurements are within the healthy 2\u201398th range. Position is consistent with parental build \u2014 symmetric and trend-stable.<\/p>\n<h3>Example 3 \u2014 A 7-year-old boy<\/h3>\n<p><strong>Inputs:<\/strong> Boy, 7 years, 22 kg, 121 cm. <strong>Reference:<\/strong> UK90 reference chart (4\u201318 y transition). <strong>Result:<\/strong> Weight ~50th, height ~75th. BMI ~50th \u2192 healthy. Aligns with mid-range UK growth for a 7-year-old.<\/p>\n<h3>Example 4 \u2014 A premature baby with corrected age<\/h3>\n<p><strong>Inputs:<\/strong> Girl, born 8 weeks early, chronological age 14 weeks. With &#8220;born preterm + corrected age&#8221; ticked, the calculator adjusts to 6 weeks corrected age. Weight 4.0 kg at 6 weeks corrected \u2014 ~50th centile on UK-WHO. This is NHS-aligned practice for premature babies up to age 2.<\/p>\n<h3>Example 5 \u2014 Teen BMI check<\/h3>\n<p><strong>Inputs:<\/strong> Girl, 14 years, 160 cm, 70 kg. <strong>BMI:<\/strong> 27.3. <strong>BMI centile:<\/strong> ~94th. Above the 91st threshold \u2014 NHS classify as overweight for age and sex. The <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a> gives the same BMI centile with extra context, and the broader <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-categories-explained.html\">BMI categories explained<\/a> page makes adult equivalents clear.<\/p>\n<h2>Common Mistakes With the Child Growth Chart<\/h2>\n<p>Even a good UK <strong>child growth chart calculator<\/strong> is easily misread. The most common errors:<\/p>\n<ul>\n<li><strong>Reading a single point as a verdict.<\/strong> Centiles are about trend over time, not a one-off measurement. A 25th-centile baby that&#8217;s been 25th every month is growing normally.<\/li>\n<li><strong>Picking the wrong sex.<\/strong> The UK charts are sex-specific. Choosing the wrong sex shifts the centile placement considerably.<\/li>\n<li><strong>Confusing centile with percentile.<\/strong> They&#8217;re the same thing \u2014 but the UK clinical standard is centile, so the NHS uses centile in red books and growth referrals.<\/li>\n<li><strong>Using adult BMI thresholds for children.<\/strong> A 13-year-old with BMI 27 isn&#8217;t overweight by adult standards, but is above the 91st centile by child standards. Use the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a>.<\/li>\n<li><strong>Skipping corrected age for preterm babies.<\/strong> NHS practice is to subtract the weeks of prematurity from the chronological age until age 2. Failing to correct inflates the apparent underweight position.<\/li>\n<li><strong>Measuring length when the child can stand and vice versa.<\/strong> Under-2s are measured lying down (length); 2+ standing up (height). A 1 cm difference is normal between methods.<\/li>\n<li><strong>Forgetting that height varies by ethnicity.<\/strong> UK charts are population-based. Children of South Asian or East Asian background may plot slightly differently at the same age without any clinical significance.<\/li>\n<\/ul>\n<h2>Benefits of Using a UK NHS Growth Chart Calculator<\/h2>\n<ul>\n<li><strong>Same chart as your health visitor.<\/strong> This calculator uses the same UK-WHO and UK90 reference data the NHS uses.<\/li>\n<li><strong>Instant reassurance at home.<\/strong> Plot between red book visits without calling the surgery.<\/li>\n<li><strong>Visual confirmation of trend.<\/strong> The inline centile chart makes a one-off measurement easy to discuss with the family.<\/li>\n<li><strong>Free, private and fast.<\/strong> No sign-up, no email, no data sent off your device.<\/li>\n<li><strong>Boys and girls handled separately.<\/strong> The sex-specific charts match NHS practice exactly.<\/li>\n<li><strong>BMI centile for under-18s.<\/strong> Built-in centile band reporting matches the Child Measurement Programme thresholds.<\/li>\n<\/ul>\n<h2>Limitations and When to Speak to a Health Visitor or GP<\/h2>\n<p>This <strong>growth chart calculator UK NHS<\/strong> is an educational tool, not a clinical instrument. NHS charting is performed by a trained health visitor, school nurse or paediatrician using calibrated scales, stadiometers and the full RCPCH Digital Growth Chart with complete LMS tables. Use this calculator for parent-friendly tracking; rely on your NHS team for clinical assessment.<\/p>\n<p>Book a review with your health visitor or GP if:<\/p>\n<ul>\n<li>Your child has dropped or risen across two or more centile spaces over a short period.<\/li>\n<li>A measurement falls outside the 0.4th\u201399.6th range.<\/li>\n<li>Your child is above the 91st (overweight) or 98th (obese) BMI centile, or below the 2nd.<\/li>\n<li>Growth has stalled, or you have concerns about feeding, hydration or development.<\/li>\n<li>You have a chronic condition, family history of growth disorders, or are concerned about puberty timing.<\/li>\n<\/ul>\n<p>For family-weight context outside the under-18 silo, our standard <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/\">BMI Calculator NHS<\/a> applies to adults. For pregnancy and newborn care use the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/pregnancy-due-date-calculator-nhs.html\">Pregnancy Due Date Calculator NHS<\/a> and the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/pregnancy-due-date-explained.html\">pregnancy due date explained<\/a> guide. Family-wide visual tools include our <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/visual-bmi-calculator.html\">Visual BMI Calculator<\/a> and the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/body-weight-visualizer.html\">body weight visualizer<\/a>. For teens moving into adult thresholds, transition to the general adult <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/healthy-bmi-weight-guide.html\">healthy BMI weight guide<\/a>.<\/p>\n<h2>Comparison \u2014 Which Calculator Should I Use?<\/h2>\n<table class=\"ctable\">\n<thead>\n<tr>\n<th>Calculator<\/th>\n<th>Best for<\/th>\n<th>Age range<\/th>\n<th>Reference<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>This growth chart calculator UK NHS<\/strong><\/td>\n<td>All measurements, full centile picture<\/td>\n<td>0\u201318 years<\/td>\n<td>UK-WHO 0\u20134, UK90 4\u201318<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a><\/td>\n<td>BMI centile only<\/td>\n<td>2\u201318 years<\/td>\n<td>UK-WHO\/UK90 BMI chart<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/baby-weight-percentile-calculator-uk.html\">Baby Weight Percentile Calculator UK<\/a><\/td>\n<td>Weight only, under-2<\/td>\n<td>0\u201324 months<\/td>\n<td>UK-WHO 0\u20132<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/height-percentile-calculator-uk.html\">Height Percentile Calculator UK<\/a><\/td>\n<td>Height only, all ages<\/td>\n<td>0\u201318 years<\/td>\n<td>UK-WHO\/UK90 height<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/percentile-calculator-uk.html\">Percentile Calculator UK<\/a><\/td>\n<td>Generic percentile lookup<\/td>\n<td>Varies<\/td>\n<td>UK-aligned<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ideal-weight-calculator-uk.html\">Ideal Weight Calculator UK<\/a><\/td>\n<td>Adult ideal weight<\/td>\n<td>18+<\/td>\n<td>NHS adult<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/visual-bmi-calculator.html\">Visual BMI Calculator<\/a><\/td>\n<td>Adult BMI as body shape<\/td>\n<td>18+<\/td>\n<td>UK-WHO adult<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Real Life Example \u2014 A Year of Centile Plotting<\/h2>\n<p>Imagine a parent using the <strong>child growth chart calculator UK NHS<\/strong> for their healthy 3-year-old daughter at four reviews: 24, 30, 33 and 36 months. Each review returns:<\/p>\n<ul>\n<li>24 months: 12.5 kg, 87 cm \u2192 weight ~50th, height ~50th.<\/li>\n<li>30 months: 13.7 kg, 92 cm \u2192 weight ~50th, height ~50th.<\/li>\n<li>33 months: 14.4 kg, 95 cm \u2192 weight ~50th, height ~75th.<\/li>\n<li>36 months: 15.1 kg, 97 cm \u2192 weight ~50th, height ~75th.<\/li>\n<\/ul>\n<p>Trend-stability on the 50th weight centile and a gentle, single-line rise to 75th on height is exactly what a healthy UK child does \u2014 small centile drift is normal and clinically insignificant. The <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/baby-weight-percentile-calculator-uk.html\">baby weight percentile calculator UK<\/a> works seamlessly for the under-2 portion, and the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/height-percentile-calculator-uk.html\">height percentile calculator UK<\/a> for the height-only check.<\/p>\n<h2>Expert Tips for Best Results From Your Calculator<\/h2>\n<ol>\n<li><strong>Measure consistently.<\/strong> Under-2s without standing ability should be measured lying down (length); 2+ should be measured standing (height). Don&#8217;t mix methods within a trend.<\/li>\n<li><strong>Weigh at the same time of day.<\/strong> Morning weights after the nappy change are most consistent for infants.<\/li>\n<li><strong>Use calibrated scales.<\/strong> Many home scales are accurate to \u00b1100 g. Health visitor and GP clinic scales are clinical-grade \u2014 compare like with like.<\/li>\n<li><strong>Always plot the trend.<\/strong> A single centile reading is one data point. Multiple readings across months reveal the trajectory.<\/li>\n<li><strong>Apply corrected age for preterm babies.<\/strong> Subtract weeks of prematurity up to age 2 per NHS practice.<\/li>\n<li><strong>Don&#8217;t agonise over the 50th.<\/strong> Children can be perfectly healthy on the 9th or 91st as long as the trend is stable.<\/li>\n<li><strong>Use the red book.<\/strong> Every visit&#8217;s centile belongs in your child&#8217;s Personal Child Health Record \u2014 the same chart, the same reference data.<\/li>\n<li><strong>Bring your centile notes to reviews.<\/strong> Health visitors and GPs love seeing plotted history \u2014 it saves time and improves care.<\/li>\n<\/ol>\n<h2>Medically Reviewed &amp; Updated July 2026<\/h2>\n<p>This <strong>child growth chart calculator UK NHS<\/strong> was written and reviewed by the <strong>BMI Calculator NHS Editorial Team<\/strong>, working in line with the Royal College of Paediatrics and Child Health (RCPCH) UK-WHO and UK90 chart specifications, WHO Child Growth Standards, the NHS Personal Child Health Record (&#8216;red book&#8217;) charts and the National Child Measurement Programme (NCMP) BMI thresholds. Last full review and clinical alignment: <strong>July 2026<\/strong>.<\/p>\n<p>The calculator provides an <em>educational approximation<\/em>, not a clinical-grade LMS centile plot. For NHS clinical-grade centiles with full LMS parameters at every age in days, use the official RCPCH Digital Growth Chart. For family-wide context, also read our general <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/healthy-bmi-weight-guide.html\">healthy BMI weight guide<\/a>, the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-categories-explained.html\">BMI categories explained<\/a> guide and our full <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/general-health-weight-ratios.html\">general health-weight ratios<\/a> reference.<\/p>\n<p>        <!-- FAQ --><\/p>\n<h2>Frequently Asked Questions \u2014 UK Growth Chart Calculator<\/h2>\n<div class=\"faq-list\" id=\"faqList\">\n<div class=\"faq-item\">\n<div class=\"faq-q\">What is a child growth chart calculator UK NHS?<\/div>\n<div class=\"faq-a\">A child growth chart calculator UK NHS is an interactive tool that plots your child&#8217;s weight, height, head circumference and BMI on the official UK-WHO and UK90 centile charts used by the NHS. It returns an estimated <strong>centile (or percentile)<\/strong> for the child&#8217;s age and sex, helping you track growth against the same UK standard used by health visitors and paediatricians.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What growth chart does the NHS use for children?<\/div>\n<div class=\"faq-a\">The NHS uses the <strong>UK-WHO growth chart<\/strong> for children aged 0\u20134 years (introduced across the NHS in 2009) and the <strong>UK90 reference chart<\/strong> for 4\u201318. Both are published by the Royal College of Paediatrics and Child Health (RCPCH) and derived using the LMS statistical method. They are the charts used in the Personal Child Health Record (&#8216;red book&#8217;) and in the National Child Measurement Programme.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How accurate is this child growth chart calculator?<\/div>\n<div class=\"faq-a\">This calculator uses published UK-WHO and UK90 reference median and spread values for the most common ages, interpolating between them. It is suitable for parent-friendly plotting and trend review at home. For clinical-grade centile plotting with full LMS parameters at every age in days, the Royal College of Paediatrics and Child Health publishes the official RCPCH Digital Growth Chart.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What centile is healthy for a child in the UK?<\/div>\n<div class=\"faq-a\">Any centile between the 2nd and 98th is statistically within the healthy range. Roughly 96 out of every 100 UK children plot between these two lines on each measurement. What matters most for healthy growth is the <strong>trend<\/strong> across reviews \u2014 consistent tracking along the same centile is the normal and healthy pattern.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Is there a difference between centile and percentile?<\/div>\n<div class=\"faq-a\">No \u2014 centile and percentile are the same thing in UK clinical practice. The NHS uses <em>centile<\/em> as the standard term; <em>percentile<\/em> is a common everyday synonym. Both refer to the percentage of children of the same age and sex whose measurement is less than yours.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Can I use the calculator for a newborn baby?<\/div>\n<div class=\"faq-a\">Yes. The calculator accepts ages from birth (0 weeks \/ 0 months) up to 18 years. For babies born preterm (under 37 weeks), NHS practice is to use <strong>corrected age<\/strong> \u2014 subtract the weeks of prematurity from the chronological age until the child reaches age 2. Use the preterm toggle on the calculator to apply this automatically.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What is a BMI centile and what does it mean?<\/div>\n<div class=\"faq-a\">A BMI centile shows where a child&#8217;s BMI sits relative to peers of the same age and sex on the UK-WHO BMI chart. The NHS classifies overweight as BMI above the 91st centile and obesity as BMI above the 98th centile. The adult BMI thresholds (18.5, 25, 30) do not apply to children. Try the dedicated <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a> for an age-aware BMI assessment.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How often should I check my child&#8217;s centile?<\/div>\n<div class=\"faq-a\">The NHS checks at birth, around 6\u20138 weeks, 8\u201312 months, 2 years, school entry (Reception, 4\u20135 years) and Year 6 (10\u201311 years) through the National Child Measurement Programme. At home, a monthly check for under-2s and a quarterly check for older children is plenty \u2014 daily weighing creates needless noise. Share trends with your health visitor at every scheduled review.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What if my baby&#8217;s centile is very low or very high?<\/div>\n<div class=\"faq-a\">A single very-low or very-high centile alone isn&#8217;t a problem if the trend is stable and the child is generally well. What triggers clinical review is a trend \u2014 dropping or rising across <strong>two or more centile spaces<\/strong> in a short time, or a measurement outside the 0.4th\u201399.6th range. Speak to your health visitor if either applies. The reference data is calibrated to UK children and to internationally pooled healthy children for the 0\u20134 portion.<\/div>\n<\/p><\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Where is the best place to record a centile measurement?<\/div>\n<div class=\"faq-a\">The Personal Child Health Record \u2014 the <strong>&#8216;red book&#8217;<\/strong> in England (and equivalent Child Health Records in Scotland, Wales and Northern Ireland) \u2014 is the official place for centile plotting. Health visitors, GPs and school nurses will also plot and discuss centiles at the same reviews. Outside the NHS, this calculator&#8217;s copy, share and print functions let you record and share results at home.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<h2>Conclusion \u2014 Plotting Healthy Growth From Birth to 18<\/h2>\n<p>A <strong>child growth chart calculator UK NHS<\/strong> brings the official UK-WHO and UK90 reference charts into the home. Enter the age, sex and measurements, and the tool returns an approximate <strong>centile<\/strong> for weight, height, BMI and head circumference \u2014 exactly the way a health visitor would plot a measurement, only instant, free and private.<\/p>\n<p>Used thoughtfully, this calculator:<\/p>\n<ul>\n<li>Reassures parents at any time between red book visits.<\/li>\n<li>Surfaces trend changes early enough to consult the health visitor.<\/li>\n<li>Aligns with the same reference data used across the NHS.<\/li>\n<li>Provides an age-appropriate BMI centile for under-18s, avoiding the misuse of adult BMI thresholds.<\/li>\n<\/ul>\n<p>Always treat a single centile as a snapshot \u2014 what matters is the trajectory across reviews. Pair this tool with the red book, scheduled health visitor reviews, and your GP&#8217;s clinical assessment when a trend changes or a measurement falls outside the 0.4th\u201399.6th range. For more, see the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-growth-percentiles-explained.html\">child growth percentiles explained<\/a> guide, our standard <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/\">BMI Calculator NHS<\/a> for adults, and the <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/what-does-my-bmi-look-like.html\">what does my BMI look like<\/a> reference.<\/p>\n<h2>Related NHS-Aligned Tools and Resources<\/h2>\n<div class=\"link-grid\">\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/\">BMI Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-bmi-calculator-nhs.html\">Child BMI Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/baby-weight-percentile-calculator-uk.html\">Baby Weight Percentile Calculator UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/height-percentile-calculator-uk.html\">Height Percentile Calculator UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/percentile-calculator-uk.html\">Percentile Calculator UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/child-growth-percentiles-explained.html\">Child Growth Percentiles Explained<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/visual-bmi-calculator.html\">Visual BMI Calculator<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/body-weight-visualizer.html\">Body Weight Visualizer<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/height-weight-visualizer.html\">Height &amp; Weight Visualizer<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ideal-weight-calculator-uk.html\">Ideal Weight Calculator UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ideal-body-weight-visualizer.html\">Ideal Body Weight Visualizer<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ideal-weight-by-height-uk.html\">Ideal Weight by Height UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/healthy-bmi-weight-guide.html\">Healthy BMI Weight Guide<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/healthy-weight-range-by-height.html\">Healthy Weight Range by Height<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/nhs-healthy-bmi-range.html\">NHS Healthy BMI Range<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/nhs-bmi-chart.html\">NHS BMI Chart<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-categories-explained.html\">BMI Categories Explained<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/what-does-my-bmi-look-like.html\">What Does My BMI Look Like<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-formula-explained-with-examples.html\">BMI Formula Explained with Examples<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/how-to-calculate-bmi-step-by-step.html\">How to Calculate BMI Step by Step<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-equation-vs-bmi-calculator-difference.html\">BMI Equation vs Calculator<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/bmi-vs-body-fat-percentage.html\">BMI vs Body Fat Percentage<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/calorie-deficit-calculator-nhs.html\">Calorie Deficit Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/what-is-calorie-deficit.html\">What Is a Calorie Deficit<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/safe-rate-of-weight-loss-per-week.html\">Safe Rate of Weight Loss<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/nhs-weight-loss-calculator.html\">NHS Weight Loss Calculator<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/nhs-weight-loss-tips.html\">NHS Weight Loss Tips<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/nhs-vs-cdc-weight-loss-guidelines-explained.html\">NHS vs CDC Weight Loss<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/pregnancy-due-date-calculator-nhs.html\">Pregnancy Due Date Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/pregnancy-due-date-explained.html\">Pregnancy Due Date Explained<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ovulation-calculator-nhs.html\">Ovulation Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ovulation-cycle-explained.html\">Ovulation Cycle Explained<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/qrisk-calculator-nhs.html\">QRISK Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/what-is-qrisk-score-nhs.html\">What Is QRISK Score NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/blood-pressure-calculator-nhs.html\">Blood Pressure Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/blood-pressure-chart-uk.html\">Blood Pressure Chart UK<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/water-intake-calculator-nhs.html\">Water Intake Calculator NHS<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/water-intake-by-age.html\">Water Intake by Age<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/general-health-weight-ratios.html\">Health-Weight Ratios Guide<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/ideal-weight-calculator-uk.html\">Ideal Weight Calculator<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/safe-calorie-deficit-guide.html\">Safe Calorie Deficit Guide<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/daily-calorie-deficit-guide.html\">Daily Calorie Deficit Guide<\/a><br \/>\n          <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/healthy-bmi-weight-guide.html\">Healthy BMI Weight Guide<\/a>\n        <\/div>\n<div class=\"disclaimer-box\">\n<h3>\u26a0\ufe0f Medical Disclaimer<\/h3>\n<p>This <strong>child growth chart calculator UK NHS<\/strong> uses published UK-WHO and UK90 reference data to estimate a centile (percentile) for weight, height, BMI and head circumference against the child&#8217;s age and sex. It is intended for informational and educational use at home only. It is not a substitute for clinical assessment by a health visitor, school nurse, paediatrician or GP, who use the official RCPCH Digital Growth Chart with full LMS parameters at every age in days. BMI Calculator NHS is not affiliated with the NHS England, RCPCH, NICE or any government body. Always consult a qualified healthcare professional if you have concerns about your child&#8217;s growth, development, feeding or weight. See our full <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/disclaimer.html\">Disclaimer<\/a>, <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/privacy-policy.html\">Privacy Policy<\/a> and <a href=\"https:\/\/bmicalculatornhs.co.uk\/blog\/terms-of-service.html\">Terms of Service<\/a>.<\/p>\n<\/p><\/div>\n<p style=\"text-align:center;font-size:.82rem;color:var(--nhs-grey-4);margin-top:24px\">\u270d\ufe0f Reviewed by the BMI Calculator NHS Editorial Team \u00b7 Calibrated against RCPCH UK-WHO &amp; UK90 reference data \u00b7 Last updated July 2026<\/p>\n<\/section><\/div>\n<\/p><\/div>\n<p><\/main><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Free child growth chart calculator UK NHS 2026. Plot your child&#8217;s weight, height and BMI on UK-WHO centile (percentile) charts. Instant results, NHS-aligned 0\u201318 years. No sign-up.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1004","page","type-page","status-publish","hentry"],"_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"_links":{"self":[{"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/pages\/1004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=1004"}],"version-history":[{"count":1,"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/pages\/1004\/revisions"}],"predecessor-version":[{"id":1975,"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/pages\/1004\/revisions\/1975"}],"wp:attachment":[{"href":"https:\/\/bmicalculatornhs.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=1004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}