Inputs
Body Fat
Hip measurement is used for female entries and ignored for male entries.
Result
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Result explanation
How to read this result
Visualization
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Body Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method.
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Guide
Using the Body Fat Calculator
What the calculator does
Start here if you need to estimate body fat percentage with the U.S. Navy circumference method and compare the outcome quickly.
It is useful for quick planning and screening, but it should support rather than replace individualized medical advice.
Formula and calculation explanation
Enter Sex, Height, Neck, Waist, and Hip. Those values let the page estimate body fat percentage with the U.S. Navy circumference method.
This page uses the U.S. Navy circumference method. It estimates body fat from height and body measurements rather than from scale weight alone.
Male Navy formula
\[BF\% = \frac{495}{1.0324 - 0.19077\log_{10}(Waist - Neck) + 0.15456\log_{10}(Height)} - 450\]
Measurements are converted into centimeters before the estimate is produced.
Female Navy formula
\[BF\% = \frac{495}{1.29579 - 0.35004\log_{10}(Waist + Hip - Neck) + 0.221\log_{10}(Height)} - 450\]
The female estimate includes hip circumference as part of the formula.
Real-world examples
- Scenario example: enter sex Male, height 178, neck 39, and waist 87. That gives you a practical way to turn a real-world health or fitness question into a quick estimate.
- Comparison example: keep the baseline values the same and change height to see how the body fat responds.
Step-by-step walkthrough
- Enter Sex, Height, Neck, Waist, and Hip.
- Choose the correct mode, category, or unit options before you calculate.
- Click Calculate Body Fat. The calculator applies the method shown above and updates the answer instantly.
- Review the body fat, then adjust one input at a time to compare scenarios cleanly.
FAQs
What does the body fat result mean?
The main result shown here is body fat. Adjust the inputs above to compare different scenarios and see how the answer changes.
Does this replace medical advice or diagnosis?
No. Health calculators are best used for rough planning and screening. They should support, not replace, individualized advice from a qualified professional.
Why might this calculator differ from another tool?
Different tools may use different reference formulas, rounding rules, or category cutoffs. This page uses the method explained in the formula section above.
Common mistakes
- Choosing a unit or mode that does not match the number entered in the field.
- Changing several inputs at once, which makes it harder to see which variable actually moved the result.
Edge cases
- If a required field is left blank or contains an unsupported value, the calculator will not return a useful result until the input is corrected.
Interpretation of results
The main result shown here is body fat. Adjust the inputs above to compare different scenarios and see how the answer changes.
- Percent outputs are easiest to interpret when you compare them with the base value or benchmark used in the formula.
- When you compare scenarios, change one key input at a time so you can tie each output change back to a specific assumption.
Related concepts and calculators
Related ideas for this page include estimates, reference ranges, body metrics, inputs and assumptions, and screening.