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BMI calculator

Work out your body mass index from kilos and centimetres (or pounds and feet) and see a guide weight range. Adults only.

AvailableIn your browserInput: Text

How to use: BMI calculator

  1. Choose metric units (kg and cm) or imperial (lb, ft and in).
  2. Enter your weight and your height.
  3. Read the BMI, its category and the weight range that fits your height.

What it accepts and what you get

Input
Weight and height of an adult.
Output
The BMI to one decimal, its category (underweight, normal, overweight, obesity) and a guide range in kg.
Where your data is processed
Your data is processed in your browser and is not sent to our servers.

Limitations and notes

  • It uses the WHO adult cut-offs: 18.5, 25 and 30.
  • It does not apply to children or pregnancy, and it cannot tell muscle from fat.
  • It is a guide, not a diagnosis: ask a health professional.
  • The data never leaves your browser.

Frequently asked questions

How is BMI calculated?

Weight in kilos is divided by height in metres squared. The tool does it with your data and shows the category using the WHO cut-offs.

Is BMI right for everyone?

No: it is a guide and only for adults. It cannot tell muscle from fat and does not apply to children or pregnancy. Ask a health professional about your health.

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