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Body Mass Index (BMI) Calculator Free

Calculate Body Mass Index (BMI) with metric and imperial units and healthy weight category ranges.

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Body Mass Index (BMI)
22.9Normal Weight

Healthy weight for height: 56.7 - 76.3 kg

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What is Body Mass Index (BMI) Calculator?

The BMI Calculator computes Body Mass Index from height and weight — weight in kilograms divided by height in metres squared — in metric or imperial units, and shows the World Health Organization category: underweight (below 18.5), healthy (18.5–24.9), overweight (25–29.9) or obese (30 and above). For example, 70 kg at 175 cm gives a BMI of 22.9. BMI is a quick screening measure, not a diagnosis.

How to use Body Mass Index (BMI) Calculator

  1. 1

    Choose units

    Metric (kg, cm) or imperial (lb, ft/in).

  2. 2

    Enter height and weight

    Type your measurements.

  3. 3

    See your BMI

    Read the BMI value and its WHO category.

Frequently asked questions

What is a healthy BMI?

18.5 to 24.9 for adults, according to the WHO.

Is BMI accurate for athletes?

Not always. BMI does not distinguish muscle from fat, so muscular people may be classed as overweight.

Does BMI apply to children?

Children and teens use age- and sex-specific BMI percentiles, so adult categories do not apply.

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