Body Fat Calculator
A tape measure and two minutes get you a usable body-fat estimate. Enter your measurements to see where you stand.
Estimated body fat
16.4%
How it works
This uses the US Navy circumference method: log-based equations built on height, neck, and waist (plus hips for women). It was designed for quick field estimates and holds up well for tracking change over time.
Measure the waist at the navel, the neck just below the larynx, and hips at the widest point, tape level and snug but not compressing.
Getting the most out of it
Same conditions every time
Measure in the morning, before food, tape in the same spots. Consistency turns a rough estimate into a useful trend.
Track the trend, not the number
Any single estimate can be off by a few points. The direction across weeks is what matters.
Pair it with the scale
Weight down while waist shrinks and lifts hold steady = fat loss, not muscle loss. Each number alone can mislead.
FAQ
Log measurements where your lifts live.
Liftoff's health log tracks bodyweight, waist, body fat, and 14 more measurements, charted right beside your training.
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