Estimate body fat percentage from tape measurements using the US Navy method.
The U.S. Navy method estimates body fat from body circumference measurements and height using a validated formula. Measure snugly with a flexible tape for best accuracy.
US Navy — Male
BF% = 495 ÷ (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450
US Navy — Female
BF% = 495 ÷ (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.22100 × log₁₀(height)) − 450
This is an estimate and not medical advice. Body composition results vary with measurement technique and individual body shape. Consult a healthcare professional for clinical assessment.
The Navy method is typically within ~3–4% of clinical methods for most people, though technique and body shape affect results. It's a convenient estimate, not a lab measurement.
Waist at the navel, neck just below the larynx, and (for women) hips at the widest point. Keep the tape level and snug but not compressing the skin.