Estimate your body fat percentage using the US Navy tape measure method. Get your lean and fat mass in pounds and kg.
Body fat percentage is the proportion of fat relative to total body weight. It's a better indicator of fitness than BMI alone.
Body Fat Categories:
Measurement Tips:
This calculator uses the U.S. Navy Method, which has an accuracy of 3-4%. For precise measurements, consider professional body composition testing methods like DEXA scans or hydrostatic weighing.
This free body fat percentage calculator uses the U.S. Navy circumference formula to estimate how much of your weight comes from fat versus lean mass, helping you understand how to calculate body fat percentage and track progress over time.
How to calculate body fat percentage at home: use a scale and a flexible tape measure to record your weight, neck, waist and (for women) hip circumference, then enter the numbers into the calculator and tap "Calculate Body Fat" at the same time of day each week.
The Navy method is very similar to how many military and army tests calculate body fat percentage, so this tool can also help when you need to calculate body fat percentage army-style for screening or fitness standards.
The result view also acts as an ideal body fat percentage calculator by showing whether your body fat falls into essential, athletic, fitness, average or above-average ranges for your gender.
Body fat percentage estimates how much of your weight comes from fat instead of muscle, bone and water, so it gives a clearer picture of your body composition than BMI, which only uses height and weight.
This calculator uses the U.S. Navy circumference method, which typically has an accuracy of about plus or minus 3 to 4 percent when you take careful, consistent measurements.
Most people only need to measure body fat percentage every 2 to 4 weeks. Day-to-day changes are mostly water weight, so focusing on longer-term trends is more helpful.
Type height, weight, neck, and waist (and hip for women). The calculator uses the US Navy tape measure method, the most accurate home estimate.
Using Siri or Brozek equations, we convert body density to body fat percentage. The result includes both fat mass and lean mass in pounds and kilograms.
Get your body fat category (essential, athletic, fitness, average, obese) based on American Council on Exercise guidelines.
For related calculations, try our BMI calculator.
FAQ
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A body fat calculator is a free tool that estimates body fat percentage using the US Navy circumference method or BMI-based formulas. Our body fat calculator takes height, neck, waist, and (for women) hip measurements to compute lean mass and fat mass in pounds or kilograms. The body fat calculator is more accurate than BMI alone for assessing health risk.
How it works
Our body fat calculator lets you estimate your body fat percentage using the U.S. Navy tape measure method in four steps.
Choose male or female. The formula is different because women store fat differently than men.
Use a tape measure to record your height, neck, and waist. For women, also measure hips at the widest point.
Type your height, neck, waist, hip (if female), and weight. Use inches and pounds for imperial, centimeters and kilograms for metric.
The calculator shows your body fat percentage, lean body mass, and fat mass in pounds or kilograms, plus the category your percentage falls into.
Understand the differences between BMI and body fat percentage, when to use each, and how to track your health.
Discover a holistic approach to health and fitness planning using advanced calculators for body composition and wellness.
Learn how BMI and other health calculations work, their limitations, and how to use them effectively.