Body Fat Calculator
A scale can't tell fat from muscle. A few tape measurements give you an approximate body fat estimate.
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fjt turns your sleep, movement, nutrition and heart rate into time gained or lost every day, and builds a personal route for you.
How it's calculated
- 1Uses the U.S. Navy circumference equation (Hodgdon & Beckett).
- 2Men: waist and neck; women: waist, hips and neck.
- 3The result is an estimate and can differ from methods such as DEXA by a few percentage points.
Frequently asked questions
How accurate is it?
The tape method is a practical estimate. It is most useful for tracking change over time with the same technique.
Where do I measure my neck?
Just below the larynx, with the tape sloping slightly downward to the front.
Why does my smart scale show something different?
Smart scales use bioelectrical impedance, which is affected by hydration; different methods give different results.
Sources
This tool produces an estimate and is not a medical diagnosis. Talk to a doctor about health decisions.