Body Fat Calculator 2025 - Free Body Fat Percentage Calculator
Calculate your body fat percentage instantly with our free online calculator. Choose between the accurate US Navy method or BMI-based estimation. Get personalized health recommendations based on your results.
Measurement Tips:
- • Neck: Measure just below the Adam's apple
- • Waist: Measure at the narrowest point, usually just above the navel
- • Take measurements without clothing for accuracy
- • Measure in the morning for consistent results
Understanding Body Fat Percentage
What is Body Fat Percentage?
Body fat percentage is the proportion of your body weight that consists of fat tissue. Unlike BMI, which only considers height and weight, body fat percentage provides a more accurate assessment of body composition by distinguishing between fat mass and lean mass (muscle, bone, organs).
A healthy body fat percentage varies by gender and age, with women naturally having higher percentages due to biological differences in body composition and reproductive functions.
Calculation Methods
US Navy Method
Uses body circumference measurements (neck, waist, hip for women) to estimate body fat. More accurate than BMI-based methods.
BMI-based Estimation
Uses the Deurenberg formula combining BMI, age, and gender. Less accurate but requires only height and weight.
Body Fat Categories
Men
Women
Frequently Asked Questions
Which calculation method is more accurate?
The US Navy method is generally more accurate than BMI-based estimation because it takes body measurements into account. However, for the most precise results, professional methods like DEXA scans, hydrostatic weighing, or bioelectrical impedance analysis are recommended.
How often should I measure my body fat percentage?
For most people, measuring body fat percentage monthly is sufficient to track changes. If you're actively trying to change your body composition through diet and exercise, bi-weekly measurements can help monitor progress. Always measure at the same time of day for consistency.
What's a healthy body fat percentage?
Healthy body fat percentages vary by gender and age. For men, 10-18% is generally considered healthy, while for women, 16-25% is typical. Athletes may have lower percentages, but going too low can be unhealthy and affect hormone production and other bodily functions.
How can I reduce my body fat percentage?
Reducing body fat percentage requires creating a caloric deficit through a combination of proper nutrition and exercise. Focus on strength training to preserve muscle mass, cardiovascular exercise for calorie burn, and a balanced diet with adequate protein. Gradual changes are more sustainable than extreme approaches.