BMI Calculator (Body Mass Index)

Calculate your BMI from height and weight. WHO classification and healthy weight range.

Body Mass Index (BMI) is a simple indicator that relates your weight to your height. Used by the World Health Organization (WHO) since the 1990s, it categorizes adults as underweight, normal weight, overweight, or obese. While imperfect (it doesn't distinguish muscle mass from fat mass), BMI remains a useful first screening tool. This calculator gives you your BMI, WHO category, and the weight range considered healthy for your height.

Calculate your BMI

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cm

BMI Scale — WHO Classification

World Health Organization categories for adults (18+ years).

Underweight
< 18.5
Normal weight
18.5 – 25
Overweight
25 – 30
Obese Class I
30 – 35
Obese Class II
35 – 40
Obese Class III
> 40

Source: World Health Organization (WHO). Classification applicable to adults 18 years and older, regardless of gender or unit system (metric or imperial). Thresholds are expressed in kg/m².

Frequently Asked Questions