Estimate your body fat percentage using the US Navy method. Enter your measurements to get your body fat %, lean mass, and fitness category.
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💪 Estimate Body Fat %
Uses the US Navy circumference method. Measure at the widest points for accuracy.
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📏 Measure waist at the narrowest point (navel level), neck just below the larynx, hips at the widest point (women only).
Body Fat %
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Fat Mass
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Lean Mass
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This is an estimate using the US Navy circumference method. For clinical accuracy, use DEXA scanning or hydrostatic weighing. Consult a healthcare professional for personalised advice.
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Body Fat Calculator — Estimate Your Body Fat Percentage
Our free body fat calculator estimates your body fat percentage using the US Navy circumference method — one of the most validated non-invasive body fat assessment techniques available. This body fat calculator requires only a tape measure and gives you your body fat percentage, fat mass, lean mass, and fitness category in seconds.
How This Body Fat Calculator Works
This body fat calculator uses circumference measurements of the waist, neck, and hips (women only) combined with height to estimate body fat percentage using the US Navy formula. The body fat calculator applies a logarithmic equation that has been validated against more precise methods like DEXA scanning for population-level accuracy within 3-4%.
Body Fat Calculator Categories
This body fat calculator classifies your result into standard fitness categories. For men: Essential fat (2-5%), Athletic (6-13%), Fitness (14-17%), Average (18-24%), Obese (25%+). For women: Essential (10-13%), Athletic (14-20%), Fitness (21-24%), Average (25-31%), Obese (32%+). Use this body fat calculator alongside our BMI Calculator for a more complete health picture.
Body Fat Calculator — Frequently Asked Questions
How accurate is this body fat calculator?
This body fat calculator using the US Navy method has a margin of error of approximately 3-4% compared to DEXA scanning. It is more informative than BMI alone since it distinguishes between fat and lean mass. For clinical-grade accuracy, use DEXA or hydrostatic weighing — this body fat calculator is best for tracking trends over time.
How do I measure correctly for this body fat calculator?
For this body fat calculator: measure waist at the narrowest point (navel level), neck just below the larynx (Adam’s apple), and hips at the widest point (women only). Use a flexible tape measure pulled snug but not compressing the skin. Take measurements first thing in the morning for consistent body fat calculator results.
What is a healthy body fat percentage according to this body fat calculator?
According to this body fat calculator, healthy body fat is approximately 10-20% for men and 18-28% for women. Athletes typically fall below these ranges. Values above 25% (men) and 32% (women) shown by the body fat calculator are associated with increased health risks.
How often should I use this body fat calculator?
Use this body fat calculator monthly for progress tracking. More frequent measurements can show misleading fluctuations due to hydration levels. Always measure at the same time of day and under the same conditions to ensure consistent body fat calculator comparisons over time.
Why is my body fat calculator result different from my BMI category?
BMI and body fat percentage measure different things. A muscular person might be classified overweight by BMI but have a healthy body fat percentage in this body fat calculator. Conversely, a “normal weight” person can have high body fat — known as skinny fat. Using both the BMI calculator and this body fat calculator together gives a more complete picture.
