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BMI Calculator

Calculate your Body Mass Index from your height and weight, in metric or imperial.

  1. Enter your height
  2. Enter your weight
  3. Read your BMI and category
24.2
Normal weight

BMI ranges: Underweight < 18.5 · Normal 18.5–24.9 · Overweight 25–29.9 · Obese ≥ 30. BMI is a rough screening measure — it doesn't account for muscle mass, age or sex.

Frequently asked questions

How is BMI calculated?
BMI is weight divided by height squared (kg/m²). In imperial units, the same formula is applied with a conversion factor for pounds and inches. The result is the same regardless of which unit system you enter values in.
What do the BMI categories mean?
The standard adult ranges are under 18.5 (underweight), 18.5–24.9 (normal), 25–29.9 (overweight) and 30+ (obese). BMI is a screening measure, not a diagnosis — it doesn't account for muscle mass, bone density or body composition.
Can I switch between metric and imperial units?
Yes — enter height and weight in either metric (cm/kg) or imperial (ft-in/lb), and the calculator converts automatically.
Is my height and weight data stored anywhere?
No. The calculation runs entirely in your browser — the numbers you enter are never uploaded or stored. No account is required.
Do I need to install anything or sign up?
No. It runs entirely in your browser — no software install, no account, no email required.
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