BMI Calculator
Body Mass Index from your height and weight, with the healthy range.
How this bmi calculator works
The bmi calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Body Mass Index from your height and weight, with the healthy range.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
For most adults, the World Health Organization defines 18.5–24.9 as the normal-weight range. Under 18.5 is considered underweight, 25–29.9 overweight, and 30+ obese.
BMI doesn't distinguish muscle from fat, so it can misclassify very muscular or very lean individuals. It's a useful screening tool, not a diagnosis — talk to a doctor for a full health picture.