Body Fat Percentage Calculator
Use precise tape measurements and this Navy-based circumference equation to estimate body fat percentage. Enter your body weight for fat mass insights.
How This Calculator Works
The Navy body fat equation relates tape measurements to fat distribution. Men use the difference between waist and neck, while women account for waist, hip, and neck to reflect gluteal fat storage. Converting the logarithmic result to a percentage reveals fat ratio; multiplying that ratio by body weight yields fat mass. Subtracting fat mass from total weight provides lean mass, a useful indicator for training plans.
Measurement Tips
- Height: stand tall without shoes and measure in centimeters.
- Neck: wrap the tape just below the larynx while keeping muscles relaxed.
- Waist: measure horizontally at the navel after exhaling normally.
- Hip (women): measure the fullest point of the glutes, keeping the tape level.
- Body Weight: use a calibrated scale and convert pounds to kilograms if needed.
Example Scenario
Lena (female) weighs 68 kg, stands 165 cm tall, and measures 34 cm at the neck, 74 cm at the waist, and 96 cm at the hips. Entering these values returns an estimated body fat of roughly 26%, fat mass near 17.7 kg, and lean mass around 50.3 kg—useful benchmarks for setting nutrition or resistance-training goals.