Body Fat Percentage Calculator
Estimate body fat percentage using US Navy tape measure method.
Last reviewed by the myCalculator Editorial Team
Input Parameters
Calculation Results
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Formula & How Body Fat Percentage Calculator Works
The US Navy method estimates body fat from tape measurements instead of callipers or scans. For men it uses height, neck and waist circumference. For women it also uses the hip measurement. Measure the neck just below the larynx, the waist at the navel, and the hips at their widest point, standing relaxed, and take each measurement twice. The formula uses the logarithm of the difference between waist and neck (plus hip for women) against the logarithm of height, so a larger waist relative to the neck gives a higher estimate. It is accurate to within a few percentage points for most people, which is good enough to track change over time, but it is not a clinical measurement.
- Enter Biological Sex: Input your target parameter value.
- Enter Height (cm): Input your target parameter value.
- Enter Waist Circumference (cm - at navel): Input your target parameter value.
- Enter Neck Circumference (cm - below larynx): Input your target parameter value.
- Enter Hip Circumference (cm - females only): Input your target parameter value.
- Apply Formula: Calculate using
US Navy Formula based on log10 ratios of body circumferences relative to height. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
How accurate is the US Navy body fat method?
It is typically within 3-4% accuracy compared to DEXA scans.
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Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
Australia's Physical Activity and Sedentary Behaviour Guidelines and dietary energy expenditure metrics.
Nutrient Reference Values (NRVs) for Australia and New Zealand, macronutrient distribution, and hydration standards.
Dedicated Australian home loans, borrowing capacity, mortgage repayments & refinance modeling.