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Calculate Body Mass Index.
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BMI Calculator works out your Body Mass Index from your height and weight, in metric (cm, kg) or imperial (feet, inches, pounds) units, and shows which category the result falls into — underweight, healthy, overweight or obese. BMI is a quick screening measure, not a diagnosis, and does not account for muscle mass, age or body shape.
Open BMI Calculator
Launch BMI Calculator directly in your browser — there is nothing to download, install, or configure first.
Enter your values
Type your numbers or details into BMI Calculator — fields update as you go.
Read your result instantly
BMI Calculator recalculates the moment you change an input, so there is no button to press and no waiting.
BMI = weight in kilograms ÷ (height in metres)². For example, 70 kg at 1.75 m gives a BMI of about 22.9.
For most adults, 18.5–24.9 is considered a healthy range. Some health bodies use lower cut-offs for South Asian populations.
Not always — muscle weighs more than fat, so very muscular people can have a high BMI while being healthy.
Yes. BMI Calculator is completely free, with no account, no paywall, and no usage limits.
No. BMI Calculator works instantly in any modern web browser — there is no software to install, no extension, and no sign-up.