What is Body Fat Calculator?
The Body Fat Calculator estimates your body fat percentage based on body measurements. It uses the widely trusted U.S. Navy circumference method. Understanding body fat percentage provides a clearer picture of physical health and fitness progress than raw body weight, helping you distinguish between muscle gain and fat loss.
Formula
U.S. Navy Method:
Male: 86.010 * log10(waist - neck) - 70.041 * log10(height) + 36.76
Female: 161.278 * log10(waist + hip - neck) - 100.228 * log10(height) - 19.00
Benefits of Using Body Fat Calculator
Accuracy Over BMI - Differentiates between lean muscle mass and fat tissue.
U.S. Navy Standard - Uses proven, non-invasive circumference formulas.
Fitness Tracking - Perfect for body recomposition goals (losing fat while maintaining muscle).
Health Assessment - Identifies risks linked to excess visceral fat accumulation.
Pro Tip: Take measurements in the morning before eating. Use a flexible tape measure and pull it snug against the skin without pressing in, keeping it horizontal to the floor.
Frequently Asked Questions
Healthy ranges: Men: 14% to 24%, Women: 21% to 31%. Essential fat (required to live) is 3% for men and 10% to 13% for women.
For most people, it is accurate within 2% to 4% of dual-energy X-ray absorptiometry (DEXA) scans, which is high for a tape measurement method.
Women have higher essential fat due to hormonal functions, childbearing, and different metabolic fat storage patterns.
Achieve a calorie deficit through diet, perform resistance training to preserve muscle mass, and increase protein intake.
Muscle is denser than fat. One kilogram of muscle occupies about 18% less volume than one kilogram of fat, making you look leaner at the same weight.
Reviewed by Rahul Kumar | Founder, WPFixHub
Updated: August 2026