Body Fat Calculator
Precisely estimate your body fat percentage using the U.S. Navy formula
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FAQ
What is the U.S. Navy body fat formula?
The U.S. Navy Body Fat Formula is a body fat estimation method developed by the United States Navy. It calculates body fat percentage using height, neck circumference, and waist circumference (plus hip circumference for women). It is widely regarded as a reliable method that requires no specialized equipment.
What is a normal body fat percentage range?
男性正常體脂率約 14-24%，女性約 21-31%。運動員等級：男性 6-13%，女性 14-20%。低於必需脂肪（男 2-5%、女 10-13%）會危害健康；超過一般範圍則屬於肥胖。
What is the difference between body fat percentage and BMI?
BMI only uses height and weight and cannot distinguish between muscle and fat. A muscular person may have a high BMI but normal body fat. Body fat percentage directly measures fat proportion, providing a more accurate assessment of body composition and health.
How to reduce body fat percentage?
降低體脂率的關鍵：1) 維持熱量赤字（攝入 < 消耗）2) 增加重量訓練保持肌肉量 3) 搭配有氧運動 4) 攝取充足蛋白質 5) 充足睡眠。建議每週減脂不超過 0.5-1%，避免急速減重。
Body Fat Percentage Category Reference
| Category | Male | Female |
|---|---|---|
| Essential Fat | 2% - 5% | 10% - 13% |
| Athlete | 6% - 13% | 14% - 20% |
| Fitness | 14% - 17% | 21% - 24% |
| Average | 18% - 24% | 25% - 31% |
| Obese | ≥ 25% | ≥ 32% |
* Data from the American College of Sports Medicine (ACSM), for reference only. Actual body fat may vary by individual
Financial Disclaimer
The results of this tool are for reference only and do not constitute investment advice. Actual values may vary due to financial institution policies, interest rate changes, and individual circumstances. Please consult a professional financial advisor before making any financial decisions.