Body composition
Body-Fat Calculators
Get a clearer picture of your body composition. Estimate your body-fat percentage with a free calculator, then use it as a starting point to follow your progress.
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Your scale tracks bodyweight. A body-fat estimate adds another useful number to your progress log. Start with a tape measure, or use skinfold readings if you have calipers. Pick the calculator below for the measurements you have and get your estimate.
Start with a tape measure or skinfold calipers
Start with our US Navy tape body-fat calculator to get an estimate from your tape measurements. For Jackson–Pollock skinfold readings, choose the Skinfold calculator.
US Navy Tape Body-Fat Calculator
Get a body-fat estimate with a tape measure. Enter your height and the requested neck, waist or abdomen, and hip measurements to establish a baseline you can track.
Estimate my body fatSkinfold Body-Fat Calculator
Turn your three- or seven-site skinfold readings into a body-fat estimate with the Jackson–Pollock equations. A useful starting point for following changes with your caliper routine.
Use my skinfold readingsWhich body-fat calculator should I use?
You can get started with a tape measure. If you already have skinfold readings, choose the equation they were measured for.
| Your goal | Recommended calculator |
|---|---|
| Get an estimate using a tape measure | US Navy Tape Body-Fat Calculator |
| Use just my height and waist measurement | Relative Fat Mass Calculator |
| Use three or seven skinfold readings | Skinfold Body-Fat Calculator |
| Use four Durnin–Womersley skinfold readings | Durnin–Womersley Body-Fat Calculator |
Tape-measure body-fat estimates
Have a tape measure? These calculators turn circumference measurements into a body-fat estimate you can record and follow over time.
Relative Fat Mass Calculator
Get an estimate from just your height, waist measurement, and sex. Relative Fat Mass (RFM) is a straightforward option when you have a tape measure and want fewer measurements to take.
Try the height & waist methodSkinfold body-fat estimates
Already taking skinfold measurements? Get an estimate from the equation that matches your three-, four-, or seven-site readings.
Durnin–Womersley Body-Fat Calculator
Use your biceps, triceps, subscapular, and suprailiac skinfold readings to estimate body-fat percentage. Choose this tool if you use the Durnin–Womersley four-site method.
Use my four-site readingsMake your estimate useful over time
Save your first result as a baseline. A few consistent measurement habits will help you get more from future checks.
Start with the equipment you have
A tape measure is enough for the US Navy and Relative Fat Mass calculators. Choose a skinfold method if you have calipers and can take its required readings.
Take the measurements the tool asks for
Each calculator tells you which sites and units to use. Follow those directions so your readings fit the equation you have chosen.
Build a consistent progress log
Use the same method and measurement routine when you check again. Record the date, measurements, and result to follow your trend.
Read the trend
Look at several results alongside your bodyweight and training progress. Small changes can come from measurement variation, so give yourself a series of checks to compare.