Body Fat Calculator
Estimate your body fat percentage using the US Navy Method
Body Fat Calculator
US Navy circumference method
Biological Sex
Measurement Unit
Why Body Fat Percentage Matters
Body fat percentage is a more accurate indicator of fitness and health than weight alone or BMI. It measures the proportion of your body weight that is fat tissue versus muscle, bone, and organs. This metric is particularly important because two people with the same weight can have very different body compositions.
For example, a muscular athlete may weigh the same as someone with more body fat, but they will have a much lower body fat percentage and better metabolic health. This is why body composition is a better measure of fitness than the scale.
Body Fat Categories
The American Council on Exercise provides these general body fat categories for adults:
Essential Fat
Men: 2-5% | Women: 10-13%
The minimum amount of fat your body needs for basic biological functions. This is not a healthy target for general populations.
Athletes
Men: 6-13% | Women: 14-20%
The range for individuals engaged in regular athletic training. This represents excellent fitness and health.
Fitness
Men: 14-17% | Women: 21-24%
A healthy range for fit, active individuals. This is a realistic and sustainable target for most people.
Average
Men: 18-24% | Women: 25-31%
A normal range for average, healthy adults. Still represents good health for the general population.
Obese
Men: 25%+ | Women: 32%+
Elevated health risks. Weight management and lifestyle changes are recommended.
About the US Navy Method
The US Navy Method is a simple, non-invasive estimation of body fat percentage based on body measurements. It uses circumference measurements (neck, waist, and hip for women; neck and waist for men) along with height to calculate an estimate of body fat percentage.
This method has been validated against hydrostatic weighing and other methods, and provides reasonably accurate estimates for most populations. It's convenient because it requires only basic measurements and no special equipment.
Important note: This is an estimate. For the most accurate body composition assessment, consider DEXA scans, hydrostatic weighing, or 3D body composition analysis.
How to Measure Correctly
Neck Measurement
Measure around the narrowest part of your neck, just below the larynx. Keep the tape measure snug but not tight. For men, measure below the Adam's apple.
Waist Measurement
Measure around your natural waist at the smallest point (usually around the level of your navel). Keep the tape measure parallel to the ground. Measure while standing, not after holding your breath.
Hip Measurement (Women Only)
Measure around the widest part of your hips and buttocks. Keep the tape measure parallel to the ground and snug but not tight.
Tip: Use a soft measuring tape (like a sewing tape) rather than a rigid ruler. Measure multiple times to ensure accuracy, and take measurements at the same time of day for consistency.
How to Reduce Body Fat
Create a Caloric Deficit: You must consume fewer calories than you burn. Aim for a deficit of 500 calories per day for about 0.5 kg (1 lb) per week of weight loss.
Prioritize Protein: Eat adequate protein (0.8-1.2g per pound of body weight) to preserve muscle while losing fat. Protein also has a higher thermic effect than other macronutrients.
Strength Training: Resistance training preserves muscle mass during weight loss and increases metabolic rate. Aim for 2-3 strength sessions per week.
Cardio and Activity: Regular cardiovascular exercise and daily movement increase calorie burn. Combine steady-state cardio with high-intensity interval training (HIIT).
Sleep and Recovery: Aim for 7-9 hours of quality sleep per night. Poor sleep increases hunger hormones and makes it harder to maintain a deficit.
Manage Stress: Chronic stress increases cortisol, which promotes fat storage. Practice stress management techniques like meditation, exercise, or time in nature.
Be Patient: Healthy fat loss is gradual. Expect to lose 0.5-1 kg of body weight per week, with most of this being fat if you're doing strength training.
Disclaimer: This calculator provides an estimate of body fat percentage using the US Navy Method. It is not a medical diagnosis. For a comprehensive body composition analysis, consult with a healthcare professional or certified fitness specialist. These estimates may be less accurate for very lean or very obese individuals.