Body fat calculator
A tape-measure estimate, not a verdict. A rough estimate, not a target or health label.
Your inputs
⌁ Calculated here. Not saved or sent.
ⓘ For adults 18+. General estimates only—not a personal nutrition plan or medical advice. Not intended for pregnancy, breastfeeding, or clinical needs.
A circumference-based estimate+
Male % = 86.010 × log10(abdomen − neck) − 70.041 × log10(height) + 36.76
Female % = 163.205 × log10(waist + hips − neck) − 97.684 × log10(height) − 78.387These Navy-style equations use inches; metric entries are converted before calculation. [2] Measurements are self-reported and results are approximate, not a clinical body-composition measurement.
- Stand relaxed. Do not suck in your abdomen or compress the skin.
- For the male formula, measure the abdomen at the navel.
- For the female formula, measure the waist at its narrowest point and the hips at their widest.
- Measure the neck below the larynx with your head neutral. Repeat measurements consistently.
Measurement locations and equations are described in this [3] method guide. The tool does not show results at or below 0% or at or above 70%, or invalid logarithm inputs; it does not clamp them to a reassuring number. This is a display guardrail, not a clinical classification. The formula may not fit your body.
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