How to Measure Body Fat Percentage (Every Method Compared)
Body fat percentage is the most direct measure of body composition — far more informative than BMI or scale weight alone. Here is every measurement method available, ranked by accuracy and practicality.
Healthy Body Fat Ranges by Sex and Category
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fit | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
Measurement Methods Compared
1. DEXA Scan (Gold Standard accuracy: ±1–2%)
Dual-energy X-ray absorptiometry measures bone density, lean mass, and fat mass simultaneously. The most accurate method outside a lab. Costs $40–100 per scan. Provides regional fat distribution data (visceral vs subcutaneous). Best for accurate baselines and progress tracking.
2. Hydrostatic Weighing (±1–3%)
You are weighed underwater, then in air. Fat floats, muscle sinks — the density difference gives an accurate body fat estimate. Highly accurate but requires specialist facilities and is uncomfortable for some people.
3. Navy Body Fat Formula (±3–5%)
Uses neck, waist, and hip circumferences. Surprisingly accurate for a tape measure method and widely used by military institutions. Free to calculate — no equipment beyond a tape measure.
4. Bioelectrical Impedance (BIA) (±3–8%)
Sends a small electrical current through the body (muscle conducts better than fat). The accuracy of home scales using BIA is heavily influenced by hydration, food intake, and time of day. Consistent measurement conditions are essential for reliable tracking.
5. Skinfold Calipers (±3–5% with trained practitioner)
Pinch measurements at specific sites (7-site Jackson-Pollock is most common). Accurate when performed by an experienced practitioner, but highly user-dependent.
How to Track Body Fat Progress Effectively
Choose one method and stick with it. Comparing DEXA to BIA measurements will confuse your tracking. Even if your BIA reading has a 5% error, if it goes from 25% to 20% over 6 months using the same scale at the same time of day, it is tracking real change accurately.
💡 For most people, the Navy formula tape measure method is the sweet spot: free, reasonably accurate (±3–5%), and reproducible at home without any equipment purchase.
Calculate Your Body Fat Percentage
Use the Navy method — enter your neck, waist, and hip measurements for an accurate body fat estimate.
Use the Body Fat Calculator →