Body Fat Percentage Calculator
Estimate your body fat percentage using the US Navy circumference method — no body scanner needed, just a tape measure.
What Does This Tool Do?
Estimate body fat percentage using the US Navy circumference formula — one of the most widely used non-equipment methods. Shows your fitness category from Essential to Obese.
Key Features
US Navy Formula
Accurate circumference-based method.
Male & Female
Different formulas and categories for each sex.
Fitness Category
Essential, Athlete, Fitness, Average or Obese.
Instant
Immediate result.
How to Use
- Select your sex.
- Enter height, waist and neck in centimetres.
- Females: also enter hip measurement.
- Click Calculate Body Fat %.
Frequently Asked Questions
How accurate is the US Navy formula?▾
Typically ±3–4% compared to DEXA scans — acceptable for monitoring trends. Not as accurate as hydrostatic weighing or DEXA but far more practical.
Where exactly do I measure waist?▾
Males: at the navel. Females: at the narrowest point (typically just above the navel).
Where do I measure neck?▾
Just below the larynx (Adam's apple), with the tape perpendicular to the long axis of the neck.