BMI Calculator
Enter your height and weight to get your Body Mass Index, the category it falls into, and the healthy weight range for your height. Works in kilograms and centimetres or pounds, feet and inches.
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How to use BMI Calculator
- 1Choose metric or imperial units.
- 2Enter your height and weight.
- 3Read your BMI, category and healthy weight range.
Features
- Metric (kg, cm) and imperial (lb, ft, in)
- WHO and Asian BMI categories
- Healthy weight range for your height
- Colour-coded BMI scale
- Nothing is stored or sent anywhere
BMI categories
The World Health Organization classifies adult BMI as: under 18.5 underweight, 18.5–24.9 healthy weight, 25–29.9 overweight, and 30 or more obese. Many Asian health authorities use lower cut-offs (overweight from 23, obese from 27.5) because health risks rise at lower BMI in Asian populations. Tick "Asian cut-offs" to use them.
Limitations of BMI
BMI is a quick screening number based only on height and weight. It does not distinguish muscle from fat, so athletes can show a high BMI, and it is not designed for children, teenagers or pregnant women. For a full picture, talk to a doctor, who may also look at waist size and other measurements.
Frequently asked questions
How is BMI calculated?
BMI = weight in kilograms ÷ (height in metres)². For example, 70 kg at 1.75 m gives 70 ÷ 3.06 = 22.9.
What is a healthy BMI?
For most adults, 18.5 to 24.9 (or 18.5 to 22.9 with Asian cut-offs).
Is BMI accurate for athletes?
Not always. Muscle is heavier than fat, so muscular people can have a high BMI while being healthy.