Body Fat Calculator
The Body Fat Calculator can be used to estimate your total body fat using specific measurements.
Calculate your body fat %
Uses the U.S. Navy formula (tape measurements).
Body Fat (U.S. Navy Method)
20.3%
Category: Above average
Body Fat Mass
31.3 lb
Lean Body Mass
122.8 lb
BMI
22.7
Notes
Tape placement and posture can shift results. Track trends using the same setup.
How this body fat calculator works
This page uses the U.S. Navy body fat formula, which estimates body fat percentage from body measurements. It’s fast, consistent, and popular for at-home tracking. Like any calculator, it’s an estimate — accuracy depends on measurement technique and body shape.
How to measure for best results
- Measure on bare skin if possible (or thin clothing).
- Stand relaxed, normal breathing, don’t suck in.
- Take each measurement 2–3 times and use the average.
- Track trends: use the same method + same time of day each time.
Calculator vs photo-based AI estimation
Tape-measure calculators are great for consistency, but they don’t “see” fat distribution or how your physique looks. Photo-based AI estimation is useful for visual reality-checks and tracking appearance changes — especially when you use consistent photos (and multiple photos for higher accuracy).
Want a visual estimate from a photo?
Upload a photo and get a body fat estimate in seconds.