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Body Fat Percentage Calculator
Estimate body fat percentage from circumference measurements using the U.S. Navy method for adults.
Live math canvas
Your numbers, formula and explanation together
Body Fat Percentage Calculator: 18.8% body fat. U.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.
Formula applied
The exact method behind this answer
CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
For a male-formula adult at 178 cm height, 90 cm waist and 40 cm neck, the equation estimates about 21% body fat.
Professional note
Master’s Tip: measurement consistency matters more than decimal precision; use the same tape position each time.
Regional and unit assumptions
U.S. Navy circumference method converted from centimetres to inches.
Assumptions and limitations
Measurements must be consistent and positive.
Circumference estimates are approximate and can differ from lab methods.
This is health education only, not diagnosis.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
U.S. Navy circumference method converted from centimetres to inches.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.
Master's Tip
Master’s Tip: measurement consistency matters more than decimal precision; use the same tape position each time.
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