BMI Calculator
Calculate your Body Mass Index
About BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see which weight category you fall into.
How to use the bmi calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Your BMI and category are shown instantly.
- All maths runs in your browser.
Frequently asked questions
What do the BMI categories mean?
Under 18.5 is underweight, 18.5–24.9 normal, 25–29.9 overweight and 30+ obese. BMI is a guide, not a diagnosis.
Are my files uploaded to a server?
No. Everything runs locally in your browser using JavaScript, so your files and text never leave your device.
Is this tool free?
Yes, it is completely free with no signup, no watermarks and no limits.