Estimate body fat from measurements.
This uses the U.S. Navy method and supports either inches or centimeters.
Nutrition & Weight Loss
Body Fat Calculator
Use this body fat calculator to estimate body fat percentage from body measurements using the U.S. Navy method.
How it works
How to use the body fat calculator
Body Fat Calculator is intended for people who want a practical body fat checkpoint without using a lab or scan. Use it to estimate body composition from measurements when scale weight alone is not telling the full story.
Measure the required body parts consistently and use the same unit each time. The calculator returns a body fat estimate.
Measurement error, tape placement, posture, and hydration can all shift the estimate. Track the trend over time rather than obsessing over a single reading, especially when the measurements are self-reported.
FAQ
Common questions about this calculator.
Use these quick answers as a starting point, then compare the result to your real-world progress.
What does the body fat calculator tell me?
Measure the required body parts consistently and use the same unit each time. The result is a body fat estimate.
How accurate is the body fat calculator?
Measurement error, tape placement, posture, and hydration can all shift the estimate.
What should I do after I get my result?
Track the trend over time rather than obsessing over a single reading, especially when the measurements are self-reported.
Who is this calculator best for?
This calculator is intended for people who want a practical body fat checkpoint without using a lab or scan.
Related calculators
Keep going with the next useful calculator.
These related tools cover the same planning workflow from calories and macros through prep timing.
Track your nutrition and workouts for free in Logbook.
If you want a cleaner place to track the daily side of your plan, Logbook is built to keep that process simple.