Estimate your body fat percentage using the US Navy method. See your fat mass, lean mass, and body composition category. More accurate than BMI for fitness assessment.
| Category | BF% Range | Fat at Your Weight |
|---|
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Body fat percentage is the single most useful metric for assessing body composition. Unlike BMI, which uses only height and weight, body fat percentage tells you how much of your weight is actually fat versus muscle, bone, and organs. This guide covers how to measure it, what the numbers mean, and how to use this information to set realistic fitness goals.
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2-5% | 10-13% |
| Athlete | 6-13% | 14-20% |
| Fitness | 14-17% | 21-24% |
| Average | 18-24% | 25-31% |
| Above Average | 25%+ | 32%+ |
Scenario 1: Average Office Worker. James, 30, male: height 175 cm, weight 82 kg, waist 90 cm, neck 38 cm. Body fat: 22.4% — Average. Fat mass: 18.4 kg. Lean mass: 63.6 kg. To reach Fitness (17%), he needs to lose about 4.4 kg of fat while maintaining muscle. Use our Calorie Deficit Calculator to plan.
Scenario 2: Active Woman. Maria, 28, female: height 165 cm, weight 62 kg, waist 72 cm, neck 33 cm, hip 96 cm. Body fat: 24.1% — Fitness. Fat: 14.9 kg. Lean: 47.1 kg. She is in the fitness category. To maintain, use our TDEE Calculator.
Scenario 3: Competitive Athlete. David, 25, male: height 180 cm, weight 85 kg, waist 78 cm, neck 40 cm. Body fat: 12.8% — Athlete. BMI says 26.2 (overweight). Body fat says athlete. This is why body fat is more useful than BMI for fit individuals. His lean mass is 74.1 kg.
Scenario 4: Weight Loss Journey. Sarah started at 35% body fat (90 kg). After 6 months of deficit eating and resistance training, she is at 27% body fat (78 kg). She lost 12 kg total: 10.5 kg fat, only 1.5 kg lean mass. That lean preservation means her metabolism stayed strong. Use our Calories Burned Calculator to optimize her training.
💡 Key insight: The scale does not tell the whole story. Someone who starts strength training may stay the same weight for months while their body composition transforms — losing fat and gaining muscle simultaneously. Body fat percentage captures this change. The scale misses it entirely. Measure body fat, not just weight.
| When | Morning, before food |
| How often | Every 2-4 weeks |
| Tape tension | Snug, not tight |
| Waist | At navel, relaxed |
| Accuracy | ±1-3% vs DEXA |