Body Fat Percentage Calculator (U.S. Navy Method)
Estimate your body fat percentage using the U.S. Navy method. Free body fat calculator with category classification for men and women.
How this calculator works
The U.S. Navy method estimates body fat from your height and a few tape measurements. It is free, repeatable and good enough to track a direction over time.
Measure first thing in the morning, same spot, relaxed, with the tape level. The consistency of your measurement matters far more than the absolute number it produces.
Frequently asked questions
How accurate is the Navy body fat method?
Typically within 3 to 4 percentage points of a DEXA scan. Its strength is tracking change over weeks, not a single precise figure.
What is a healthy body fat percentage?
Commonly cited healthy ranges are roughly 10 to 20 percent for men and 18 to 28 percent for women, with athletes often lower.
Why did my body fat estimate go up after training hard?
Water retention changes waist measurements day to day. Compare weekly averages instead of single readings.
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