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⚠️ Medical Emergencies
This contact form is for general enquiries only — not for medical emergencies. If you need urgent medical assistance, please call 999 or NHS 111. For health concerns about your BMI or weight, please speak to your GP. Our tools are for information only — see our Disclaimer for full details.
Frequently Asked Questions
Common questions before you get in touch.
🏥 Are you affiliated with NHS England?
No. BMI Calculator NHS is an independent website. We align our tools with NHS guidelines but have no official connection to NHS England or any NHS Trust.
🔒 Is my health data stored?
No. All calculator data — your height, weight, age — is processed entirely in your browser. Nothing is ever sent to or stored on our servers.
🆓 Are your tools really free?
Yes — completely free, forever. No sign-up, no subscription, no hidden charges. We display Google AdSense ads to cover our running costs.
🩺 Can you give medical advice?
No. Our tools and content are for educational purposes only. For health concerns, always consult your GP or call NHS 111.
📊 How accurate are your BMI results?
Our calculators use the standard NHS BMI formula (kg/m²) with current NHS category thresholds. Results match what your GP's computer would calculate using the same inputs.
📱 Do your tools work on mobile?
Yes — all our tools are fully responsive and work on any device including smartphones, tablets, and desktop computers.