Our Mission
BMI Calculator NHS was created with a simple but important goal: to give every person in the UK free, instant access to NHS-aligned health calculation tools — without having to navigate complex NHS websites, download apps, or create accounts.
We believe that understanding your BMI, your healthy weight range, and your child's growth percentile are fundamental health literacy tools. They help people have more informed conversations with their GP, set realistic health goals, and monitor their family's wellbeing over time.
All of our tools — from the Visual BMI Calculator to the Child Growth Chart Calculator UK — are built around current NHS guidelines, are completely free to use, and process all health data locally in your browser. We never store your health information.
Our Commitment to You
🩺 Always NHS-Aligned
Our tools use the same BMI thresholds and growth chart data referenced by NHS GPs. We update our content whenever NHS guidelines change.
🔒 Zero Health Data Storage
Every calculation runs in your browser. Your height, weight, and age never leave your device — ever. No accounts, no data collection.
📖 Honest & Transparent
We are clear about what our tools can and cannot do. We are not affiliated with NHS England and we never claim to provide medical advice.
♿ Accessible to All
We build with accessibility standards in mind, including keyboard navigation, screen reader support, and mobile-first responsive design.
⚠️ Important Notice
BMI Calculator NHS is an independent website and is not affiliated with, endorsed by, or connected to NHS England or any NHS Trust. Our tools are for informational and educational purposes only — they are not a substitute for professional medical advice. Always consult your GP for health decisions. Please read our full Disclaimer, Privacy Policy, and Terms of Service.
Get in Touch
Have a question, suggestion, or want to report an issue with one of our tools? We'd love to hear from you. We read every message and aim to respond within 5 business days.