Body Fat Calculator (US Navy Method)
Estimate body fat percentage, lean mass, and fat mass using circumference measurements
cm
cm
cm
kg
Calculation ResultFitness
Estimated Body Fat
16.2%
Loading visualization...
Lean Body Mass
62.8 kg
Fat Mass
12.2 kg
Classification
Fitness
How this calculator works
1
Measure your neck and waist circumferences (and hips for women) with a flexible tape.
2
Enter your height and body weight.
3
View your body fat percentage and fitness classification.
Formula & Mathematics
US Navy Circumference Body Fat Formula
Men: 495 / (1.0324 - 0.19077·log₁₀(waist-neck) + 0.15456·log₁₀(height)) - 450
Women factor waist, hip, neck, and height into the logarithmic density model.
Worked Example
Male, 175 cm tall, 84 cm waist, 38 cm neck, 75 kg weight
Difference = 84 - 38 = 46 cm.
• Navy formula calculation yields ~16.2% body fat
• Fat Mass: 12.1 kg
• Lean Mass: 62.9 kg
Body fat is 16.2%, categorized in the Fitness tier.
Frequently Asked Questions
Measure horizontally at the level of your navel, keeping the tape snug but not compressing the skin, after exhaling normally.
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