Body Fat Percentage Calculator
Estimate adult body-fat percentage from circumference measurements using the U.S. Navy method. Use the result as a rough screening estimate, not a diagnosis.
Estimated body fat
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Measure carefully with a flexible tape for a more consistent estimate.
How the Body Fat Calculator Works
The U.S. Navy circumference method estimates body-fat percentage from height plus neck and waist measurements, with hip circumference also used in the female equation.
Measurement tips
Keep the tape level and snug without compressing the skin. Repeating measurements at the same time of day can improve consistency.
Important: Circumference formulas can be several percentage points off for an individual. Hydration, body shape, measurement technique and muscle mass affect results. For clinical accuracy, use a professional body-composition assessment.