Body Fat Calculator
Estimate body fat percentage using the US Navy method
Range: 15 - 80
Range: 80 - 400
Range: 1 - 8
Range: 0 - 11
Body Measurements
At navel level
Below larynx
Body Fat Percentage
17.5%
Fitness
Body Composition
144.4 / 30.6
Lean / Fat mass (lbs)
Fat Mass
30.6 lbs
17.5% of total weight
Lean Mass
144.4 lbs
82.5% of total weight
Body Fat Categories (Men)
| Category | Range |
|---|---|
| Essential Fat | 2-5% |
| Athletic | 6-13% |
| Fitness | 14-17% |
| Average | 18-24% |
| Obese | 25%+ |
How to Measure
- Waist: Measure at the narrowest point, or at navel level for men. Keep the tape level.
- Neck: Measure just below the larynx (Adam's apple) with tape sloping slightly downward.
- Take measurements in the morning before eating. Keep tape snug but not compressing skin.
About This Method
The US Navy method uses body circumference measurements to estimate body fat percentage. While convenient, it's less accurate than methods like DEXA scans or hydrostatic weighing. Results can vary by ±3-4%. This method works best for people with average body compositions.
Calculator Assumptions
- Formula: US Navy circumference method (Hodgdon-Beckett equations)
- Accuracy: ±3-4% compared to DEXA; less accurate for very lean or obese individuals
- Measurement timing: Results vary with hydration, time of day, and recent meals
- Categories: Based on American Council on Exercise guidelines; optimal ranges vary by age
- Limitations: Does not account for muscle mass distribution, bone structure, or ethnicity
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