Health & Fitness
Body Fat Percentage Calculator
Estimate adult body fat from height and tape measurements using the Navy equation.
For non-pregnant adults only. Not appropriate for children, pregnancy, breastfeeding or medical nutrition planning. Estimates do not replace advice from a qualified clinician. Tape measurements and body shape can shift the result by several percentage points. Invalid circumference differences or estimates outside 0–100% are rejected.
Good to know
Frequently asked questions
How do I use it?
Fill in the options and press “Calculate”. Check the result, then copy or download it.
How does it work?
Converts cm to inches for the U.S. Navy logarithmic equations. Measure neck just below the larynx, abdomen at the navel for the male equation, natural waist for the female equation, and hips at the widest point for the female equation. Keep the tape level and avoid compressing the skin.
Are there limitations?
For non-pregnant adults only. Not appropriate for children, pregnancy, breastfeeding or medical nutrition planning. Estimates do not replace advice from a qualified clinician. Tape measurements and body shape can shift the result by several percentage points. Invalid circumference differences or estimates outside 0–100% are rejected.
Is my data uploaded?
No. Everything is processed in your browser and nothing is sent to a server. No account is needed.
Keep exploring
Related tools
Macro Calculator
Convert your calorie target and protein/carbohydrate/fat percentages into daily grams.
Running Pace Calculator
Work out pace per km and mile and speed from distance and time.
Ideal Weight Calculator
Compare a Devine adult weight estimate with the BMI 18.5–24.9 weight range.
Calorie Deficit Calculator
Subtract a chosen deficit from maintenance calories and show an energy-equivalent estimate.