为什么体脂率很重要
体脂率是衡量健康和体适能的关键指标。与体质指数（BMI）不同，它专门测量脂肪含量，有助于区分瘦体重和脂肪质量。这一信息对于设定健身目标和监测进展至关重要。
如何使用体脂计算器
- 1选择您偏好的测量方法和单位系统
- 2请输入您的性别和基本测量数据
- 3准确输入所需的身体测量数据
- 4测量您的体脂百分比及其类别
准确测量的技巧
在早餐前进行测量。使用柔性卷尺，并且始终在相同的部位进行测量。为了获得最准确的结果，请健身专业人士帮您测量。
常见问题解答
获取关于体脂肪、体脂百分比以及如何优化饮食以达到健身目标的问题解答。
计算器使用经过验证的公式，如美国海军方法，对于大多数人来说，如果测量正确，准确度可达3-4%。若需临床精确度，请使用DEXA扫描或水下称重等方法。
健康范围因性别和年龄而异。对于男性来说，一般认为10-20%是健康的，而对于女性来说，18-28%是健康的。运动员的百分比可能更低，而较高的百分比可能表明健康风险增加。
Circumference methods typically sit within a few percentage points of densitometry for groups, with larger errors for individuals — especially if you are very lean, very muscular, or carry fat in atypical places. Treat the result as an estimate, not a lab measurement.
For the Navy method, measure the waist at the narrowest point, or at the navel if there is no obvious narrowing. Keep the tape level, snug but not compressing skin, and measure after a normal exhale.
Yes. The Navy equations use different circumference sites and coefficients. Men need abdomen and neck; women need waist, hip and neck. Using the wrong sex formula produces a meaningless number.
ACE and similar ranges put essential fat around 2–5% for men and 10–13% for women, athletes lower than the general fitness range, and obesity above roughly 25% (men) or 32% (women). Age, sex and sport matter; a clinician or sports dietitian can interpret your number.
BMI ignores composition. Two people with the same BMI can have very different fat percentages. The circumference method can also overestimate if the tape is loose or placed too high/low.
No. DEXA, hydrostatic weighing and Bod Pod are laboratory methods. This calculator is a field estimate for tracking trend when you measure the same way each time.
Every 2–4 weeks is enough during a cut or bulk. Circumferences fluctuate with gut content, hydration and training. Compare weekly averages, not single days.
Yes. Measure in the morning after using the bathroom, before food, with the same tape. Evening measurements are often higher because of food volume and fluid shifts.
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追踪你的进展
定期使用这个计算器来追踪你的身体成分变化。记住，健康、可持续的体脂减少需要时间，并且应该通过均衡的营养和规律的运动来实现。
The U.S. Navy circumference method
This calculator implements the circumference equations developed for naval personnel: abdomen and neck for men; waist, hip and neck for women, combined with height. The method is a field estimate. It is cheaper and faster than DEXA, and less precise.
Tape placement dominates error. Measure at the same landmarks, with the same tension, at the same time of day. A loose tape underestimates circumferences and can swing the percentage by several points.
Using the number without obsessing
Body-fat percentage is more informative than scale weight when you are training. Still, the trend over weeks beats any single reading. Hydration, gut content and menstrual cycle can move circumferences without a real fat change.
If you need a clinical or athletic classification, ask for a method your coach or clinician trusts. This page exists so you can run the Navy math yourself and see the inputs.
Formula source: U.S. Navy circumference method — Naval Health Research Center