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Calculate your Body Mass Index instantly. Get your BMI category, healthy weight range, and health insights. Free and private — runs in your browser.
⚠️ Note
BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for medical advice.
Two numbers in, one number out — but the third step is the one worth reading.
Enter your height and weight
Switch between metric (cm/kg) and imperial (ft/in, lbs) with the toggle. Enter your measurements — the result updates as you type.
Read your BMI and category
You'll see your BMI number alongside the category it falls into: Underweight (below 18.5), Normal (18.5–24.9), Overweight (25–29.9), or Obese (30+). The healthy weight range for your height is shown below.
Understand what it means — and what it doesn't
BMI is a population-level screening tool, not a personal health verdict. A muscular 90 kg person at 180 cm gets a BMI of 27.8 (overweight) despite being in excellent shape. Use it as one data point, not a diagnosis.
Health questionnaires and forms
Doctors, insurers, and fitness programs often ask for your BMI. This gives you the number in seconds without needing a calculator.
Tracking weight changes over time
Recalculate every few months to see whether your BMI is trending in the direction you want. The number itself matters less than the direction.
Setting a target weight
The healthy weight range shows the actual kg or lbs that correspond to a normal BMI for your height — useful for setting a concrete goal.
Comparing metric and imperial
If you know your weight in stone or your height in feet and inches, the imperial mode handles the conversion so you don't have to.
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