How it works
The method combines height with neck and waist measurements for men, and height with neck, waist, and hip measurements for women. The calculator also displays a separate BMI-based estimate for context.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
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?unitSystem=UnitsChoice · Required · Default: metric · Accepted values: metric, imperial
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?sex=Sex used by equationChoice · Required · Default: male · Accepted values: male, female
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?age=AgeNumber · Required · Default: 30
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?weightKg=WeightNumber · Required · Default: 80 · Used when unitSystem = metric
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?heightCm=HeightNumber · Required · Default: 180 · Used when unitSystem = metric
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?neckCm=Neck circumferenceNumber · Required · Default: 39 · Used when unitSystem = metric
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?waistCm=Waist circumferenceNumber · Required · Default: 90 · Used when unitSystem = metric
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?hipCm=Hip circumference (used for female equation)Number · Required · Default: 100 · Used when unitSystem = metric
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?weightLb=WeightNumber · Required · Default: 176 · Used when unitSystem = imperial
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?feet=Height feetNumber · Required · Default: 5 · Used when unitSystem = imperial
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?inches=Height inchesNumber · Required · Default: 11 · Used when unitSystem = imperial
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?neckIn=Neck circumferenceNumber · Required · Default: 15.4 · Used when unitSystem = imperial
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?waistIn=Waist circumferenceNumber · Required · Default: 35.4 · Used when unitSystem = imperial
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?hipIn=Hip circumference (used for female equation)Number · Required · Default: 39.4 · Used when unitSystem = imperial
Outputs
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bodyFatNavy body-fat estimatePercentage · Primary output
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categoryBody-fat categoryText
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bmiEstimateBMI-based estimatePercentage
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fatMassEstimated fat massText
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leanMassEstimated lean massText
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bmiBMINumber
Measurement limit
Hydration, tape placement, posture, and body shape can affect the estimate. Clinical methods may produce different results.