A comprehensive guide to body fat percentage — what it is, how to measure it, healthy ranges for men and women, and why it matters more than BMI.
Body fat percentage is the proportion of your total body weight that is made up of fat tissue. Unlike BMI, which only considers height and weight, body fat percentage gives you a much more accurate picture of your body composition and overall health. Estimate yours using our Body Fat Calculator.
Why Body Fat Percentage Matters More Than Weight
Two people can weigh the same but look completely different. A 75 kg person with 15% body fat has a very different physique and health profile than a 75 kg person with 30% body fat. The first person has about 11 kg of fat and 64 kg of lean mass (muscle, bone, organs); the second has 22.5 kg of fat and only 52.5 kg of lean mass.
This is why athletes with significant muscle mass are often misclassified as "overweight" by the BMI scale. Body fat percentage eliminates this problem by directly measuring what matters: how much of you is fat versus lean tissue.
Healthy Body Fat Ranges
Body fat norms differ significantly by gender because women naturally carry more essential fat for reproductive functions.
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athletes | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
How to Measure Body Fat
There are several methods, ranging from simple estimations to highly accurate lab tests:
- US Navy Method (Tape Measure): Uses neck, waist, and hip (for women) circumference measurements. This is what our Body Fat Calculator uses. Accuracy: ±3-4%.
- Skinfold Calipers: Measures the thickness of skin folds at specific body sites. Requires training for accuracy. Accuracy: ±3-4%.
- Bioelectrical Impedance (BIA): Sends a small electrical current through the body. Available in smart scales. Accuracy: ±3-5% and varies with hydration.
- DEXA Scan: A low-dose X-ray that provides a detailed breakdown of fat, lean, and bone mass by body region. Considered the gold standard. Accuracy: ±1-2%.
- Hydrostatic Weighing: Measures body density by underwater weighing. Highly accurate but inconvenient. Accuracy: ±1-2%.
The US Navy Body Fat Formula
The formula used in our calculator is based on a logarithmic model developed by the US Navy:
- Men: %BF = 86.010 × log₁₀(waist − neck) − 70.041 × log₁₀(height) + 36.76
- Women: %BF = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
This method is widely used by military organizations globally because it requires only a tape measure and provides reliable results when measurements are taken correctly.
Tips for Reducing Body Fat
- Create a moderate calorie deficit of 300-500 calories per day. Use our Calorie Calculator to find your target.
- Prioritize protein — aim for 1.6-2.2g per kg of bodyweight to preserve muscle mass during fat loss.
- Resistance train 3-4 times per week — building muscle increases your resting metabolic rate.
- Get 7-9 hours of quality sleep — poor sleep increases hunger hormones and promotes fat storage.
- Manage stress — chronic stress elevates cortisol, which promotes abdominal fat storage.
Get your current body fat estimate with our free Body Fat Calculator and track your progress over time.