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BMI Calculator
Body Mass Index gives a quick weight-to-height snapshot. Enter your details below.
Enter your weight and height to see your BMI.
Formula
BMI = weight (kg) ÷ height (m)² — imperial: BMI = 703 × weight (lb) ÷ height (in)²
How to calculate
- 1Use metric units (kg and m) or the imperial form directly — both give the same number.
- 2Square your height: multiply it by itself (1.75 m → 3.0625).
- 3Divide your weight by the squared height (70 ÷ 3.0625 = 22.9).
- 4Compare the result to the ranges: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese.
How to use this calculator
- 1Pick your unit system — metric or imperial.
- 2Enter your weight and height.
- 3Your BMI appears instantly with the range it falls in.
- 4Use Save to keep the result in your account or Share to send a link.
Examples
Metric example
A person weighing 70 kg at 1.75 m: 70 ÷ (1.75 × 1.75) = 22.9 — normal weight.
Imperial example
A person weighing 160 lb at 70 in: 703 × 160 ÷ 4,900 = 22.9 — the same BMI.
Common questions
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