Find out your body fat percentage instantly using the clinically-validated US Navy Method. Understand what your number means and what to do about it.
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✔ Last medically reviewed: January 2025
Calculate Your Body Fat %
Enter your measurements below. We use the US Navy Method — one of the most accurate non-invasive formulas available.
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kg
⚠ Please fill in all required fields with valid values.
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Body Fat Percentage
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Category
EssentialAthleteFitAcceptableObese
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Fat Mass (kg)
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Lean Mass (kg)
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BMI
ℹ Results are estimates based on the US Navy Method. For medical decisions, consult a healthcare professional.
What Is Body Fat Percentage?
Body fat percentage is the proportion of your total body weight that is composed of fat tissue. Unlike weight alone, it tells you how much of your body is functional mass (muscle, bone, organs, water) versus fat storage.
Two people can weigh the same yet have completely different health profiles. A 180 lb person at 12% body fat is very different from a 180 lb person at 30% body fat. That's why body fat percentage is considered far more meaningful than weight or even BMI by fitness and medical professionals.
Essential Fat vs. Storage Fat
Not all body fat is bad. Essential fat is required for normal bodily functions — hormone production, vitamin absorption, brain health, and insulation. Men need a minimum of ~3% and women ~12% to sustain life.
Storage fat accumulates in adipose tissue and is used as an energy reserve. Moderate amounts are healthy, but excess storage fat — especially visceral fat around organs — raises the risk of cardiovascular disease, type 2 diabetes, and metabolic syndrome.
How We Calculate Your Body Fat
This calculator uses the US Navy Body Fat Method, developed by Hodgdon and Beckett (1984) and widely used by the military, fitness professionals, and researchers.
All measurements are in centimeters. The formula uses logarithmic scaling to account for proportional differences in body shape across individuals.
Why We Use This Method
No special equipment needed — just a measuring tape
Accuracy within 3–4% of DEXA scan results
Validated across diverse populations
Used by US military for official fitness assessments
Fast and repeatable for tracking progress over time
How to Measure Correctly
Waist: Measure at the narrowest point, usually around the navel, not the widest part
Neck: Measure just below the larynx (Adam's apple), sloping slightly downward
Hips (women): Measure at the widest point across the buttocks
Take measurements in the morning before eating
Keep the tape parallel to the floor and snug but not compressing
Healthy Body Fat Percentage Ranges
Body fat categories vary by gender. Use the table below to understand where your result falls.
Men
Category
Body Fat %
What It Means
Essential Fat
2–5%
Minimum required for survival; not sustainable long-term
Athletes
6–13%
Competitive athletes; high muscle definition visible
Fitness
14–17%
Lean and healthy; some muscle definition
Acceptable
18–24%
Average range; healthy but some excess fat
Obese
25%+
Increased risk of chronic disease; weight loss advised
Women
Category
Body Fat %
What It Means
Essential Fat
10–13%
Minimum required; women naturally carry more essential fat
Athletes
14–20%
Competitive athletes; high performance and leanness
Fitness
21–24%
Lean and active; healthy and sustainable
Acceptable
25–31%
Average range; healthy with some stored fat
Obese
32%+
Elevated health risks; lifestyle changes recommended
How to Reduce Body Fat
Sustainable fat loss requires a combination of caloric deficit, exercise, and lifestyle habits. There's no single shortcut — but there is a clear, evidence-backed path.
1. Create a Caloric Deficit
Fat loss occurs when you burn more calories than you consume. A deficit of 300–500 calories per day leads to approximately 0.3–0.5 kg of fat loss per week — a healthy, maintainable rate.
2. Prioritize Protein
High-protein diets (1.6–2.2g per kg of bodyweight) help preserve lean muscle while in a deficit. Protein also increases satiety, reducing overall calorie intake naturally.
3. Strength Train Regularly
Resistance training builds and maintains muscle mass, which raises your resting metabolic rate. Even 3 sessions per week of compound movements (squats, deadlifts, presses) can significantly improve your body composition.
4. Add Cardiovascular Exercise
Cardio increases your total caloric expenditure. Aim for 150+ minutes of moderate-intensity cardio weekly. HIIT (high-intensity interval training) can be especially effective for fat oxidation in less time.
5. Prioritize Sleep and Manage Stress
Poor sleep elevates cortisol, which promotes fat storage — particularly visceral fat. Chronic stress has a similar effect. Prioritizing 7–9 hours of quality sleep and stress management techniques can have a measurable impact on body composition.
Frequently Asked Questions
For men, a healthy body fat percentage is generally considered to be 10–20%. For women, it's 18–28%. Athletes often fall below these ranges, while values above 25% (men) or 32% (women) are classified as obese by most health organizations.
The US Navy Method is accurate within approximately 3–4% of DEXA scan results when measurements are taken correctly. It is one of the most widely validated non-invasive methods and is used for official military fitness assessments.
Every 4–6 weeks is a good frequency. Body fat doesn't change overnight, and measuring too frequently can lead to frustration due to normal fluctuations from water weight, digestion, and hormonal cycles. Monthly measurements give you a clearer picture of progress.
Yes — this is called "normal-weight obesity" or being "skinny fat." Someone can be within a normal BMI range while still having a high body fat percentage and low muscle mass. This condition carries similar health risks to traditional obesity, including insulin resistance and cardiovascular risk.
The gold standard is a DEXA (Dual-Energy X-ray Absorptiometry) scan, which is accurate to within 1–2%. Hydrostatic weighing (underwater weighing) is also very accurate. For home use, the US Navy Method or skinfold calipers (with a trained measurer) offer the best balance of accuracy and convenience.
Yes. As we age, muscle mass naturally declines (sarcopenia) and body fat tends to increase — even if total weight stays the same. This is why staying active with resistance training becomes increasingly important after age 30. Some health guidelines adjust acceptable ranges slightly for older adults.