Body Fat Calculator
Estimate body fat percentage using the US Navy method (circumference-based). Enter measurements in metric or US units to get an estimate with formulas.
Choose sex and units, enter measurements, then click Calculate.
Results
Estimated body fat
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Notes
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Formula
Tool description
The US Navy body fat method estimates body fat percentage using circumference measurements (waist, neck, and hip for females) and height. It’s a convenient estimate, but it may not match lab methods (DEXA, hydrostatic weighing).
How to use
- Select sex and units.
- Enter height, neck, and waist. If female, enter hip.
- Calculate to see estimated body fat % and the formula used.
- Copy results to compare progress over time.
Why it’s useful
- Track changes in body composition over time using consistent measurements.
- Complement BMI with a body fat estimate.
- Support fitness goals (cutting, bulking) with a simple metric.
Use cases & interpretation
- Progress tracking: measure at the same time of day and under the same conditions for better comparisons.
- Goal setting: use body fat % alongside strength and performance metrics.
- Health context: use results as a screening estimate, not a diagnosis.
FAQs
It’s a practical estimate. Accuracy varies by body type and measurement technique. For highest accuracy, clinical methods may differ.
Measurement sites can vary by instructions and standards. Use a consistent method and compare trends over time.
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