Body Fat Calculator

Body Fat Percentage & Composition Calculator

Estimate body fat using the official U.S. Navy tape circumference method, BMI-based Deurenberg formulas, and analyze lean body mass vs. fat mass

Weight in lbs
Below larynx / Adam’s apple
At navel level (horizontal)
Estimated Body Fat Percentage
16.4%
Fitness Category (14% – 17%)
Fat Mass: 28.7 lbs • Lean Body Mass: 146.3 lbs
Body Fat Mass 28.7 lbs Total weight of adipose tissue
Lean Body Mass (LBM) 146.3 lbs Muscle, bone, water & organs
Calculation Method U.S. Navy Hodgdon-Beckett Circumference logarithmic formula
Estimated Accuracy ±3.5% Variance Standard tape measure variance
Deurenberg BMI Body Fat Estimation
Body Mass Index value
BMI-Estimated Body Fat Percentage
19.7%
Average / Fitness Category
Formula: (1.20 × BMI) + (0.23 × Age) − (10.8 × Sex) − 5.4
Estimated Body Fat % 19.7% Deurenberg empirical formula
Input BMI Score 24.8 kg/m² Normal weight classification
Age Adjustment Factor +7.36% Age-related adipose increase
Formula Reliability Adult Population Standard Validated across broad demographics
American Council on Exercise (ACE) Classification Standards
Fat Category Men (% Fat) Women (% Fat)
Essential Fat2% – 5%10% – 13%
Athletes6% – 13%14% – 20%
Fitness14% – 17%21% – 24%
Average18% – 24%25% – 31%
Obese25%+32%+
Your Current Classification Summary
16.4% — Fitness Range
Calculated via U.S. Navy Method