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BMI Calculator

Check your body mass index and the healthy weight range for your height, in metric or imperial units. Free, no sign-up, and it runs in your browser: nothing you type is sent anywhere.

Units
Your BMI
22.9
Category
Healthy weight
Healthy weight for your height
56.7 kg – 76.3 kg

BMI doesn't tell muscle from fat: very muscular people can score as overweight. It's not meant for children or pregnancy.

Read the full guide: What Is a Healthy BMI? Chart, Formula and Examples

How to calculate BMI

Quick answer: To calculate BMI, choose your units and enter height and weight.

  1. Choose your units. Kilograms and centimetres, or pounds and feet/inches.
  2. Enter height and weight. Your BMI and category appear straight away.

BMI categories

Under 18.5 is underweight, 18.5–24.9 healthy, 25–29.9 overweight and 30 or more obese, according to the World Health Organization.

What BMI doesn't show

BMI doesn't tell muscle from fat, so athletes can score as overweight. Pair it with the body fat or waist-to-hip calculators for a fuller picture.

Frequently asked questions

What is the BMI formula?

BMI = weight in kg ÷ (height in m)². In pounds and inches: 703 × lb ÷ in².

Is BMI accurate for children?

No. Children and teens need age-based BMI charts. This calculator is for adults.