BMI 計算機

単位系

BMI 基準

身長センチメートル(cm)

体重 kg

年齢（任意・体脂肪推定）歳

性別

目標 BMI（任意）

BMI: -

体重分類: -

健康体重範囲: -

理想体重 (BMI 22): -

正常範囲までの差: -

ポンデラル指数: -

推定体脂肪率: -

目標体重: -

健康アドバイス: -

計算過程: -

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.