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BMI calculator

Enter your weight and height in metric or imperial units. Reference categories for adults aged 20 and over, excluding pregnancy.

Changing units clears your measurements. Both dots and commas are accepted as decimal separators.

In meters: for example 1.83.

The thresholds are the same for adult women and men, so sex is not requested.

BMI is a screening indicator, not a diagnosis. It does not distinguish muscle from body fat. These categories are not suitable for people under 20 or during pregnancy. Your inputs stay in your browser.

Sources: CDC adult categories and NHS guidance on limitations.

Method and assumptions

Formula: BMI = weight (kg) ÷ height (m)²

Method version 1.0.0 · Example: 80 kg and 2 m → 20 kg/m². Display rounded to two decimal places; classification uses the unrounded value.