Body Fat Calculator
Calculate your body fat percentage using the US Navy circumference method. Enter neck, waist (and hip for females) measurements. Get your lean mass, fat mass, and fitness category.
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Frequently asked questions about body fat calculator.
How is body fat percentage different from BMI?
BMI estimates body size from height and weight, while body fat percentage estimates how much of your body is composed of fat tissue. Two people can have the same BMI but very different body fat levels.
What method does this body fat calculator use?
It uses the US Navy circumference method, which estimates body fat from measurements such as waist, neck, height, and hip for females. It is practical and accessible, though not as precise as DEXA or hydrostatic testing.
Is the Navy body fat formula accurate?
It is reasonably useful for tracking and screening, but it is still an estimate. Measurement technique, body shape, hydration, and how tightly the tape is held can all affect the result.
What body fat range is considered healthy?
Healthy ranges vary by sex and age, but in general women carry a higher essential fat level than men. Fitness goals, athletic performance, and medical context matter, so the most useful range depends on the individual.
How often should I measure body fat?
Every few weeks is usually enough for progress tracking. Day-to-day changes are often too small to interpret and can be distorted by measurement error, water retention, and timing.