What is a healthy body fat percentage?

For men, 10–20% is considered fitness to average. For women, 18–28% is the fitness to average range. Athletes typically have lower body fat: 6–13% for men and 14–20% for women.

Which method is more accurate — Navy or BMI?

The Navy circumference method is more accurate than the BMI method. For the most accurate results, use DEXA scan or hydrostatic weighing, but the Navy method is a good practical estimate.

How often should I measure body fat?

Body fat changes slowly. Measuring every 4–8 weeks is sufficient. Daily measurements are not useful as hydration and other factors cause daily fluctuations.

What is lean body mass?

Lean body mass is your total weight minus fat weight. It includes muscle, bone, organs, and water. Maintaining or increasing lean mass is important for metabolism and overall health.

Can I reduce body fat in specific areas?

No — spot reduction is a myth. Fat loss occurs throughout the body based on genetics and overall caloric deficit. Targeted exercises build muscle in specific areas but don't preferentially burn local fat.

Body Fat Calculator

Estimate your body fat percentage using the Navy or BMI method

Health & Wellness | Free tool

Calculation Method

Your Measurements

Gender

Age (years)

Height ()

Weight ()

Waist circumference () — measured at navel

Neck circumference () — below larynx

Hip circumference () — widest point

Measurement Tips

Waist: Measure horizontally at the navel level. Relax — do not suck in.
Neck: Measure just below the larynx (Adam's apple), sloping slightly downward.
Hip (women): Measure at the widest point of the hips and buttocks.
Use a soft tape measure and take measurements in the morning for consistency.

Results

Enter your measurements and click Calculate

Body Fat Percentage

Fat Mass

Lean Mass

Body Fat Scale

Essential Athlete Fitness Average Obese

Reference Ranges ()

About This Method

The US Navy circumference method uses body measurements to estimate body fat. It is widely used by the military and is considered more practical than BMI-based methods.

Formula (Male): %BF = 86.010 × log₁₀(waist − neck) − 70.041 × log₁₀(height) + 36.76

Formula (Female): %BF = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387

The BMI method (Deurenberg formula) estimates body fat from BMI, age, and gender. It is less accurate than circumference measurements because BMI does not distinguish muscle from fat.

Formula: %BF = 1.2 × BMI + 0.23 × age − 10.8 × sex − 5.4 (sex = 1 for male, 0 for female)

What Is Body Fat Percentage?

Understanding what body fat percentage means and why it matters more than weight alone

Body fat percentage is the proportion of your total body weight that is composed of fat tissue. Unlike body weight alone, it tells you how much of your body is fat versus lean mass — which includes muscle, bone, organs, and water. Two people of the same weight can have dramatically different body compositions, and body fat percentage reveals this difference.

Tracking body fat percentage is a more meaningful measure of health and fitness progress than the scale alone. You can lose fat while gaining muscle and see no change in weight — but your body composition improves significantly. This is why athletes and fitness professionals use body fat percentage rather than BMI or raw weight to track progress.

Body Composition

Body fat percentage distinguishes fat mass from lean mass, giving a complete picture of your physique that weight alone cannot provide. It is the gold standard for tracking fitness progress.

Health Indicator

Excess body fat — especially around the abdomen — is strongly linked to cardiovascular disease, type 2 diabetes, and metabolic syndrome. Knowing your body fat helps you assess real health risk.

Progress Tracking

When you exercise and eat well, the scale may not move much as you build muscle while losing fat. Body fat percentage tracks the real progress that the scale misses entirely.

Body Fat Percentage Categories

What your body fat percentage means according to the American Council on Exercise (ACE)

Men's Body Fat Categories

Category Body Fat % Description

Essential Fat 2 – 5% Minimum needed for basic body functions

Athlete 6 – 13% Typical of competitive athletes

Fitness 14 – 17% Fit, lean, active individuals

Average 18 – 24% Acceptable for general health

Obese 25%+ Elevated health risk

Women's Body Fat Categories

Category Body Fat % Description

Essential Fat 10 – 13% Minimum needed for hormonal health

Athlete 14 – 20% Typical of female athletes

Fitness 21 – 24% Fit, active women

Average 25 – 31% Acceptable for general health

Obese 32%+ Elevated health risk

How to Reduce Body Fat

Evidence-based strategies to lower your body fat percentage while preserving lean mass

Create a Caloric Deficit

Fat loss fundamentally requires consuming fewer calories than you expend. A deficit of 300–500 calories per day leads to sustainable fat loss of about 0.3–0.5 kg per week without excessive muscle loss. Use our Calorie Deficit Calculator to find your target.

Eat Sufficient Protein

Protein is the single most important nutrient for fat loss. It preserves lean muscle during a deficit, increases satiety, and has a high thermic effect. Aim for 1.6–2.2 g of protein per kg of body weight daily. Our Macro Calculator can help you plan your intake.

Strength Train Regularly

Resistance training preserves and builds muscle mass while you lose fat, improving your body composition even if scale weight doesn't drop. Aim for 2–4 sessions per week targeting all major muscle groups with progressive overload.

Prioritize Sleep & Recovery

Poor sleep elevates cortisol and ghrelin (hunger hormone), making fat loss far harder. Studies show that sleep-deprived dieters lose significantly more muscle and less fat. Aim for 7–9 hours of quality sleep per night consistently.

Frequently Asked Questions

Common questions about body fat percentage and how to measure it

For men, 10–20% is considered the fitness to average range. For women, 18–28% is the comparable range. Athletes typically carry lower body fat: 6–13% for men and 14–20% for women. Essential fat — the minimum required for survival and organ function — is 2–5% for men and 10–13% for women.

The Navy circumference method is significantly more accurate than the BMI method. BMI cannot differentiate muscle from fat, so muscular people are often incorrectly classified as overweight. The Navy method uses actual body measurements to estimate fat distribution. For the highest accuracy, methods like DEXA scan, hydrostatic weighing, or air displacement plethysmography (Bod Pod) are preferred, but the Navy method is the best practical estimate without special equipment.

Body fat changes slowly — typically no more than 0.5–1% per month with consistent diet and exercise. Measuring every 4–8 weeks is sufficient and provides meaningful data. Daily measurements are counterproductive because hydration, food intake, and other factors cause fluctuations of 1–2% day to day that have nothing to do with actual fat change.

Lean body mass (LBM) is your total weight minus the weight of your body fat. It includes all muscle tissue, bone, organs, blood, and water. LBM is important because it drives your metabolic rate — the more lean mass you have, the more calories you burn at rest. Preserving or increasing lean mass during fat loss is a key goal of effective body recomposition.

No — spot reduction is a myth. Despite what some exercise marketing claims, you cannot preferentially burn fat from a specific area by training that body part. Fat is released from adipose tissue throughout the body in response to a caloric deficit, determined largely by genetics and hormones. Targeted exercises like crunches build muscle in specific areas but do not preferentially burn fat there. The only way to reduce fat in any specific area is overall fat loss.