⚖️BMI Calculator
Body Mass Index from height & weight (metric/imperial).
Disclaimer: These tools are for general information and educational use only and are not medical advice, diagnosis or treatment. Individual health needs vary. Always consult a qualified doctor or healthcare professional before making health decisions.
About the BMI Calculator
Calculate your Body Mass Index (BMI) from your height and weight using metric or imperial units. See your BMI category — underweight, normal, overweight or obese — based on WHO ranges. Free, private and instant.
How to use the BMI Calculator
- 1Enter your details (such as height, weight or age) into the BMI Calculator.
- 2Pick your preferred units and any relevant options.
- 3Read your estimated result and the guidance shown below it.
- 4Results are indicative only — always consult a professional for medical decisions.
Why use this tool?
Private by design
The BMI Calculator runs entirely in your browser — nothing you enter is uploaded to a server.
Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
How is BMI calculated?＋
BMI = weight (kg) ÷ height (m)². For imperial units it uses 703 × weight(lb) ÷ height(in)².
What is a healthy BMI range?＋
According to the WHO, 18.5–24.9 is considered a normal, healthy weight.