💪 Free Tool · Navy Method

Body Fat Calculator

Estimate your body fat percentage at home using the US Navy method — no equipment needed beyond a tape measure.

Your Measurements
in
in
in
📏 Measuring tips: Stand straight. Measure waist at the navel (not the narrowest point). Measure neck below the larynx. Women also measure hips at the widest point.
Your Results
📏

Enter your measurements to estimate your body fat percentage.

🔬

US Navy Method

This formula uses circumference measurements to estimate body fat. It's accurate to within 3–4% for most people — not as precise as DEXA scans but far more accessible.

📊

Body Fat Categories

Essential fat: 2–5% (M) / 10–13% (F). Athletes: 6–13% / 14–20%. Fitness: 14–17% / 21–24%. Average: 18–24% / 25–31%. Obese: 25%+ / 32%+.

⚠️

Limitations

This is an estimate only. Body fat varies with hydration, time of day, and measurement technique. For medical decisions, consult a healthcare professional and consider a DEXA scan.

Common Questions

What is a healthy body fat percentage?

For men: 6–17% is considered athletic to fit. 18–24% is average. Above 25% is considered obese. For women: 14–24% is athletic to fit. 25–31% is average. Above 32% is considered obese. Essential fat (needed for survival) is 2–5% for men and 10–13% for women.

How accurate is this calculator?

The US Navy method is typically accurate within 3–4% of more precise methods like DEXA scans. Accuracy depends on taking measurements correctly. The most accurate methods are DEXA scan, hydrostatic weighing, and Bod Pod — but these require professional equipment.

How do I reduce my body fat percentage?

Body fat is reduced through a calorie deficit (eating less than you burn), combined with resistance training to preserve muscle. Aim for 0.5–1% body fat loss per month for sustainable results. Crash diets cause muscle loss and are counterproductive long-term.

How to Measure Body Fat Percentage at Home

The US Navy body fat method is one of the most accessible ways to estimate body fat percentage without expensive equipment. All you need is a flexible measuring tape. For men, measure your waist at the navel and your neck just below the larynx. For women, also measure your hips at the widest point. Enter these measurements along with your height into our calculator above for an instant estimate.

What Is a Healthy Body Fat Percentage?

For men, a healthy body fat range is generally 10-20%. Athletes often fall between 6-13%, while the average man is 18-24%. For women, healthy ranges are 18-28%, with athletes at 14-20% and average women at 25-31%. Essential fat — the minimum needed for survival — is 2-5% for men and 10-13% for women.

How to Reduce Body Fat Percentage

The most effective way to reduce body fat is through a combination of a moderate calorie deficit and resistance training to preserve muscle mass. Aim to lose 0.5 to 1% body fat per month for sustainable results. Crash diets cause muscle loss and are counterproductive. Use our calorie calculator alongside this body fat calculator to build your complete fitness plan.

Body Fat vs BMI: Which Measurement Matters More?

BMI (Body Mass Index) is a simple ratio of weight to height that is widely used in medicine but has significant limitations. It cannot distinguish between muscle and fat — a muscular athlete may have a "overweight" BMI while a sedentary person of the same weight might be classified as "normal." Body fat percentage is a far more meaningful measure of health and fitness because it directly measures how much of your body is fat versus lean mass.

For most fitness and health goals, body fat percentage is the metric you should focus on. Someone reducing body fat from 30% to 20% has made significant health improvements even if their weight on the scale barely changes, because they have replaced fat with muscle. This is why many fitness professionals track body fat percentage rather than just body weight.

Most Accurate Ways to Measure Body Fat

From most to least accurate: DEXA scan (X-ray based, gold standard), hydrostatic weighing (underwater), Bod Pod (air displacement), DEXA is available at many hospitals and sports medicine clinics for $50-150. These methods are within 1-2% accuracy. The Navy tape measure method used in our calculator is within 3-4% accuracy for most people — quite good for a free at-home test.

Whatever method you use, consistency matters more than absolute accuracy. Track your body fat with the same method at the same time of day under the same conditions. The trend over time is what tells you whether your diet and exercise program is working, not any single measurement.

Complete Guide to Reducing Body Fat

Reducing body fat requires a consistent calorie deficit over time. There is no way to spot-reduce fat from specific body parts — when you are in a calorie deficit your body pulls fat from all over based on genetics. However, building muscle in specific areas through targeted resistance training can change the shape and appearance of those areas even before significant fat loss occurs.

The most effective fat loss programs combine moderate calorie restriction with resistance training and adequate protein intake. Cardio exercise accelerates fat loss but is not required — the calorie deficit is what drives fat loss regardless of how you create it. Resistance training is important because it preserves muscle mass during a deficit, ensuring the weight you lose is primarily fat rather than muscle.

Sleep quality significantly impacts body composition. Poor sleep elevates cortisol levels, increases hunger hormones, reduces satiety hormones, and impairs muscle recovery. Adults who sleep less than 7 hours per night lose a higher proportion of muscle versus fat when dieting compared to those who sleep 8+ hours. Prioritizing 7-9 hours of quality sleep is one of the most impactful but often overlooked aspects of body composition improvement.

Setting Realistic Body Fat Goals

Most people can sustainably lose 0.5-1% of body weight per week. For a 200-pound person that is 1-2 pounds per week. Losing body fat faster than this typically means losing significant muscle along with the fat. Set a realistic timeline for your goal — going from 30% to 20% body fat for a 180-pound person means losing about 18 pounds of fat, which at a healthy rate takes 9-18 weeks of consistent effort.

📺 Watch: How to Measure Body Fat at Home

Learn how to accurately measure your body fat percentage using simple at-home methods including the Navy tape measure method.