Body Fat Percentage Calculator
指导
Body Fat Percentage Calculator
Estimate your body fat percentage using two established methods: the US Navy circumference method and the BMI-based formula. Enter your measurements in metric or imperial units, select your sex, and get your estimated body fat percentage, BMI, fat mass, lean mass, and fitness category. A visual spectrum bar shows where you fall across the body fat categories from essential fat to obese.
如何使用
Select your sex (male or female) and unit system (metric or imperial). For the US Navy method, enter your height, weight, waist circumference, and neck circumference. Women also enter hip circumference. For the BMI method, enter height, weight, and age. The calculator shows results from both methods side by side, along with your body composition breakdown and fitness category classification.
特征
- US Navy Method – Circumference-based calculation using waist, neck, and hip measurements with logarithmic formulas for higher accuracy
- BMI Method – Height, weight, and age-based estimation as a simpler comparison point
- Male & Female Formulas – Sex-specific calculations with different measurement requirements and category ranges
- Metric & Imperial – Toggle between centimeters/kilograms and inches/pounds
- Body Composition – Fat mass and lean mass calculated in your chosen unit, plus BMI value
- Visual Category Spectrum – Color-coded progress bar showing Essential Fat, Athletes, Fitness, Average, and Obese ranges
- Categories Table – Reference table showing body fat percentage ranges for each category by sex
常问问题
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How accurate is the US Navy body fat method?
The US Navy method estimates body fat within about 3-4% of results from more expensive methods like DEXA scans or hydrostatic weighing. It was developed for military fitness assessments and has been validated across large populations. Accuracy depends on taking consistent, precise circumference measurements. The method works best for people with typical body proportions and may be less accurate for highly muscular individuals or those with unusual fat distribution patterns.
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Why does the BMI method give a different result than the US Navy method?
The BMI method uses only height, weight, and age, so it cannot distinguish between fat mass and muscle mass. A muscular person may show a high BMI-based body fat estimate despite actually having low body fat. The US Navy method uses circumference measurements that better capture where fat is distributed on the body. The BMI method is included as a quick reference, but the US Navy method is generally more reliable for individual assessment. Comparing both results gives you a reasonable range.
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What is a healthy body fat percentage?
Healthy ranges differ by sex. For men, essential fat is 2-5%, athletes typically range 6-13%, fitness level is 14-17%, average is 18-24%, and above 25% is considered obese. For women, essential fat is 10-13%, athletes range 14-20%, fitness level is 21-24%, average is 25-31%, and above 32% is obese. Women naturally carry more essential fat for reproductive and hormonal functions. The ideal percentage depends on your goals, age, and overall health. Consult a healthcare professional for personalized guidance.
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Where should I measure waist and neck circumference?
For the US Navy method, measure your waist at the narrowest point of your natural waistline, typically at or just above the navel. Stand relaxed and do not suck in your stomach. Measure your neck just below the larynx (Adam's apple) with the tape sloping slightly downward at the front. Women should measure hips at the widest point of the buttocks. Use a flexible measuring tape pulled snug but not compressing the skin. Take measurements in the morning before eating for the most consistent results.
