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BMI Calculator – Body Mass Index

Enter your weight and height to calculate your BMI, see the WHO category and the healthy weight range for your height.

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Your BMI

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Healthy weight for your height

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BMI is a screening measure for adults and does not account for muscle mass, age or sex. It is not medical advice.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the BMI Calculator

  1. 1 Choose metric (kg, cm) or imperial (lb, inches).
  2. 2 Enter your weight and height.
  3. 3 Read your BMI, the category and the healthy weight range for your height.

What is BMI?

Body mass index relates your weight to your height: BMI = weight (kg) / height (m)². Someone who weighs 70 kg and is 1.75 m tall has a BMI of 70 / 1.75² = 22.9. In imperial units the formula is 703 × weight (lb) / height (in)².

BMI categories for adults

BMI Category (WHO)
below 18.5 Underweight
18.5 – 24.9 Healthy weight
25 – 29.9 Overweight
30 or higher Obesity

The healthy weight range shown by the calculator is the weight that corresponds to a BMI between 18.5 and 24.9 at your height.

Limitations of BMI

BMI is a quick screening tool, not a diagnosis. It does not distinguish between muscle and fat, so athletes can have a high BMI while being very fit. It also doesn’t account for age, sex, ethnicity or where fat is stored – waist circumference is often a better indicator of health risk. BMI categories for children and teenagers use age- and sex-specific percentiles and differ from the adult table.

Medical disclaimer

This calculator is for general information only and is not medical advice. Talk to your doctor or a dietitian about your weight and health.

Frequently asked questions

What is a healthy BMI?

For adults, a BMI between 18.5 and 24.9 is considered a healthy weight by the World Health Organization.

Is BMI accurate for muscular people?

Not very. Muscle is heavier than fat, so muscular people can be classified as overweight even when their body fat is low.

Can I use this BMI calculator for children?

No. Children and teenagers need BMI-for-age percentile charts, which take growth into account.

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