BMI (body mass index) = weight(kg) ÷ height(m)^2. It’s a quick, population-level screening metric for weight status.

What are BMI limitations?

BMI doesn’t separate fat from muscle and ignores fat distribution. Athletes, older adults, pregnancy, and children need better context or different tools.

What should I track alongside BMI?

Consider waist/WHR, body-fat estimate, weight trend, and training performance—not BMI alone.

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BMI計算機

身長と体重を入力して成人のBMI区分を計算します（小児・妊娠中は対象外）。

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WHR計算機
体脂肪推定 (US Navy)
維持カロリー / TDEE

Note: Children and teens require age/sex percentiles. Try our Kids BMI percentile calculator →

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