Health Calculators
Body Fat Calculator
Body Fat Calculator estimate body fat percentage with the U.S. Navy circumference method.
Health Calculators
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method.
Formula
Centimeter inputs are first converted to inches because the published U.S. Navy constants use inches. Male: 86.010 log10(waist-neck) - 70.041 log10(height) + 36.76. Female: 163.205 log10(waist+hip-neck) - 97.684 log10(height) - 78.387.
About the Body Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method. Health calculators provide a formula-based estimate for the named screening, nutrition, body, reproductive, exercise, or clinical quantity.
How the Body Fat Calculator Works
Centimeter inputs are first converted to inches because the published U.S. Navy constants use inches. Male: 86.010 log10(waist-neck) - 70.041 log10(height) + 36.76. Female: 163.205 log10(waist+hip-neck) - 97.684 log10(height) - 78.387.
The calculation runs in your browser. Submitted values are validated for the required numeric range, data shape, units, and method-specific restrictions before a result is shown.
Required Inputs
- Sex (required) Options: Male, Female
- Height cm (required)
- Neck cm (required)
- Waist cm (required)
- Hip cm (optional)
Results Reported
The result panel shows the final answer together with the intermediate quantities needed to audit the calculation. Depending on this method, reported values include:
methodsexheight_cmneck_cmwaist_cmhip_cmheight_inchesneck_incheswaist_incheship_inchesbody_fat_percentplausibility_warning
Body Fat Calculator Example
Use the example data button, calculate, and review the formula and worked solution before using the result.
| Input | Example value |
|---|---|
| Sex | male |
| Height cm | 175 |
| Neck cm | 38 |
| Waist cm | 86 |
| Hip cm | 95 |
How to Use the Calculator
- Confirm that the calculator title and method match the quantity, test, conversion, or planning question you need to solve.
- Enter values with compatible units and the requested sample, group, matrix, count, date, or option format.
- Select Example Data to inspect a valid input layout, or enter your own values and select Calculate.
- Review the result table, formula, worked substitutions, warnings, and interpretation rather than using only the headline number.
- Use Copy Result or Download CSV when you need a reusable record of the displayed calculation.
Understanding the Result
These estimates are educational and are not a diagnosis or a substitute for individualized care from a qualified health professional.
Keep the entered values, units, selected options, and any warning shown beside the result. For a hypothesis test, report the statistic, degrees of freedom where applicable, p-value, alpha level, effect size, and decision. For an estimate or conversion, report the formula convention and final unit.
Accuracy and Limitations
The calculator keeps full browser precision during calculation and rounds only for display. Accuracy still depends on correct inputs and on whether the displayed model represents the real problem. Educational calculators cannot replace required professional review, current official rules, field measurements, laboratory methods, or specialist statistical software where those are necessary.
Frequently Asked Questions
What does the Body Fat Calculator calculate?
Estimate body fat percentage with the U.S. Navy circumference method.
Which formula does the Body Fat Calculator use?
Centimeter inputs are first converted to inches because the published U.S. Navy constants use inches. Male: 86.010 log10(waist-neck) - 70.041 log10(height) + 36.76. Female: 163.205 log10(waist+hip-neck) - 97.684 log10(height) - 78.387.
What does this calculator show?
It shows the entered values, the formula used, calculated variables, and the final answer.
What should I check before using the result?
Confirm the inputs, units, selected mode, domain restrictions, and displayed formula match the problem you need to solve.