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BMI calculator

Enter your weight and height to get your BMI instantly, its World Health Organization classification and the healthy weight range for your height. Works with metric and imperial units.

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Your BMI

A guide for adults only. Not valid for children, pregnant women or very muscular people: consult a health professional.

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How to use

  1. 1Choose metric (kg and cm) or imperial (pounds, feet and inches).
  2. 2Enter your weight and height.
  3. 3See your BMI, category and position on the color scale.
  4. 4Check the recommended healthy weight range for your height.

Use cases

  • Get a rough idea of whether your weight suits your height.
  • Set a realistic weight goal within the healthy range.
  • Track progress during a diet or exercise plan.
  • Calculate the BMI of patients or clients in nutrition clinics or gyms.

Frequently asked questions

How is BMI calculated?

Weight in kilograms divided by height in meters squared. For example, 70 kg and 1.75 m give 70 / (1.75 × 1.75) = 22.9. In imperial units: 703 × lb / in².

What BMI values are normal?

According to the WHO, for adults: under 18.5 is underweight; 18.5 to 24.9 is normal; 25 to 29.9 is overweight; 30 or more is obesity (class I up to 34.9, class II up to 39.9 and class III from 40).

Does BMI apply to everyone?

No. It does not tell muscle from fat, so it overestimates in muscular athletes and may underestimate in older people. It is not applied the same way to children, teenagers or pregnant women.

What is BMI Prime?

Your BMI divided by 25 (the upper limit of normal weight). A value of 1.0 is right at that limit; above it indicates overweight.

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