BMI計算機
体格指数を計算して健康状態を確認しましょう！
単位
身長
体重
* BMIは一般的なスクリーニングツールであり、医学的なアドバイスではありません。健康相談は専門家にご相談ください。
BMI計算ツールとは？
The BMI Calculator computes your Body Mass Index — a widely used screening tool that estimates body fat based on your height and weight. BMI provides a quick, accessible way to assess whether your weight falls within a healthy range, though it has important limitations. Developed by Belgian mathematician Adolphe Quetelet in the 1830s, BMI is calculated as weight (kg) divided by height squared (m²). The World Health Organization classifies BMI into categories: underweight (<18.5), normal (18.5-24.9), overweight (25-29.9), and obese (30+). This calculator accepts both metric and imperial measurements and provides your BMI with contextual health information. It also explains BMI's limitations and when other health metrics might be more appropriate.
- ✓ WHO基準にもとづく体重状態の分類
- ✓ 健康的な体重範囲と目標体重を自動計算
- ✓ 国際単位系（kg/cm）と英米単位系（lb/ft）の両方に対応
- ✓ Supports both metric (kg/cm) and imperial (lbs/ft) measurements
- ✓ Contextual health information with WHO classification categories
よくある質問
▶BMIとは何ですか？
BMI（体格指数）は、身長と体重に基づく体脂肪の指標です。体重(kg)を身長(m)の二乗で割って計算します。
▶健康なBMIの範囲は？
BMI 18.5〜24.9が普通体重です。18.5未満は低体重、25〜29.9は過体重、30以上は肥満に分類されます。
▶BMIは誰にでも正確ですか？
BMIは有用なスクリーニングツールですが、筋肉量、骨密度、体組成は考慮されません。アスリートは健康でもBMIが高い場合があります。
▶Is BMI accurate for everyone?
No. BMI doesn't distinguish between muscle and fat mass, so muscular athletes may be classified as overweight despite being healthy. It's also less accurate for elderly people, pregnant women, and growing children. Waist circumference and body fat percentage are often better indicators.
▶What is a healthy BMI range?
The WHO defines 18.5-24.9 as the normal BMI range. However, optimal BMI can vary by ethnicity, age, and individual factors. Some Asian health organizations use lower thresholds (23 for overweight) due to different body composition patterns.
▶Should I rely solely on BMI for health assessment?
No. BMI is a useful screening tool but should be considered alongside other metrics like waist-to-hip ratio, body fat percentage, blood pressure, cholesterol levels, and overall fitness. Consult a healthcare professional for comprehensive health assessment.
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