BMR Calculator
Estimate basal metabolic rate with Mifflin–St Jeor and Harris–Benedict formulas.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method.
Introduction
Body fat percentage provides more insight into composition than weight alone. This tool uses the US Navy circumference method, which estimates body fat from height, neck, waist, and (for women) hip measurements. Results include a fitness category band to help interpret the estimate.
Benefits
- No calipers required
- Sex-specific Navy formulas
Educational wellness tool only — not medical advice. Consult a qualified healthcare professional for personal decisions.
How It Works
- Select sex
- Enter height, neck, and waist (plus hip for women)
- View estimated body fat % and category
Formula Used
US Navy body fat formula (log10 circumference method)
Examples
Example: Male, 178 cm, neck 38 cm, waist 84 cm → typical athletic/fitness range depending on measurements.
Frequently Asked Questions
How should I measure waist?
Measure at the navel level, standing relaxed, without sucking in the abdomen.
Why is hip required for women?
The female US Navy equation includes hip circumference for accuracy.
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