BMI Calculator

Unit system

BMI standard

Height Centimeter(cm)

Weight kg

Age (optional, for body fat) years

Gender

Target BMI (optional)

BMI: -

Category: -

Healthy weight range: -

Ideal weight (BMI 22): -

Distance to healthy range: -

Ponderal index: -

Estimated body fat: -

Target weight: -

Health advice: -

Calculation: -

BMI Calculator

Body Mass Index (BMI) is a common adult screening index for weight status. This tool supports metric/imperial units and China, WHO, Japan, Singapore cut-offs, plus healthy weight range, ideal weight, Ponderal index, and reverse target-weight calculation.

Formula

BMI = weight(kg) ÷ height(m)². Example: 170 cm, 65 kg → 65 ÷ 1.70² ≈ 22.5.

Healthy weight range = normal BMI bounds × height². China: about 18.5×h² to 23.9×h².

Ponderal index = weight(kg) ÷ height(m)³.

China vs WHO

China (WS/T 428): overweight ≥24, obese ≥28
WHO: overweight ≥25, obese ≥30
Singapore (Asian): healthy to 22.9, high risk ≥27.5

Notes

For adults ≈18+; children need growth-chart percentiles.
Not ideal alone for pregnancy, athletes with high muscle mass, or severe edema/sarcopenia.
BMI does not separate fat vs muscle or show fat distribution.

Disclaimer: For self-check only—not medical advice.