How to measure
Neck
Measure just below the Adam’s apple (mid-neck). Keep the tape level and relaxed.
Waist
Measure at the level of your belly button (navel) for men. Do not suck in your stomach.
Hips (women only)
Measure the widest part of your hips and glutes, with feet together.
Small measurement errors (1–2 cm) can significantly affect your body fat result.
What is body fat percentage?
Body fat percentage is the proportion of fat mass compared to your total body weight.
It is one of the most accurate indicators of health, aesthetics, and fitness level compared to weight alone.
Body fat percentage is more important than weight. Two people with the same weight can look completely different depending on their body composition.
How body fat is calculated
This calculator uses the US Navy method, it estimates body fat using circumference measurements such as waist, neck and height.
Body Fat %
Total fat ratio in your body
Lean Mass
Muscle, bones, water
Fat Mass
Stored body fat in kg
US Navy Body Fat Formula
Men
495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450Women
495 / (1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)) - 450This US Navy body fat formula is one of the most widely used methods for estimating body composition without specialized equipment. All measurements must be entered in centimeters (cm). Using inches or mixed units will produce incorrect results.
Note: This is an estimation formula. For medical accuracy, DEXA scans are required.
What is a healthy body fat percentage?
Healthy body fat ranges depend on gender, age and activity level.
Athletes typically have lower body fat, while average healthy ranges vary between 10–25% for men and 18–30% for women.