無料 体脂肪計算機
米海軍方式を使用して体脂肪率を計算。数回の体測定で正確な結果を取得。
1. Unit System
2. Your Measurements
測定のヒント
- Neck: Measure just below the larynx (Adam's apple)
- Waist: Measure at the narrowest point (usually at navel level)
よくある質問
What is a healthy body fat percentage?
Healthy body fat ranges vary by sex. For men: essential fat 2-5%, athletes 6-13%, fitness 14-17%, acceptable 18-24%, obese 25%+. For women: essential fat 10-13%, athletes 14-20%, fitness 21-24%, acceptable 25-31%, obese 32%+.
How accurate is the Navy body fat formula?
The U.S. Navy method is accurate within 3-4% for most people when measurements are taken correctly. It's more accurate than BMI-based methods but less accurate than DEXA scans or hydrostatic weighing.
What is the Navy method for body fat?
The U.S. Navy method calculates body fat using height and circumference measurements. For men, it uses neck and waist measurements. For women, it adds hip measurements. The formula was developed by the U.S. Naval Health Research Center.
Why is body fat percentage better than BMI?
Body fat percentage directly measures fat versus lean mass, while BMI only considers height and weight. Athletes may have high BMI but low body fat due to muscle mass. Body fat percentage provides a more accurate picture of health and fitness.
How do I take accurate body measurements?
For accurate measurements: use a flexible tape measure, measure directly on skin (not over clothing), keep the tape snug but not tight, and measure at the same time of day. For waist, measure at the narrowest point. For hips, measure at the widest point. For neck, measure just below the larynx.