Estimate your body fat percentage using the U.S. Navy Method - a fast and reasonably accurate technique that uses tape measurements at the neck, waist, and (for women) hips. Useful for tracking real fitness progress when scales don't tell the full story.
Used only for BMI body fat estimate.
Body fat (U.S. Navy)
17.8%
Fitness
Body fat (BMI estimate)
19.8%
Deurenberg formula
Healthy ranges
U.S. Navy body fat is accurate within ±3–4% of DEXA. For competitive athletes or medical contexts, consider DEXA, hydrostatic weighing, or skinfold testing by a trained professional.
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Body fat percentage is a far more meaningful health and fitness marker than body weight or BMI. Two people of identical height and weight can have wildly different bodies - one with 12% body fat (lean, athletic) and another with 28% body fat (overweight, sedentary). The scale doesn't differentiate; body fat percentage does. For anyone serious about fat loss or muscle gain, tracking body fat percentage every 4-6 weeks gives a far clearer picture of true progress than the bathroom scale.
This calculator uses the U.S. Navy method - the most accurate tape-measurement approach available, accurate to within ±3-4% of DEXA scans (the medical gold standard) when measurements are taken correctly. The method has been used by the U.S. military since 1981 for body composition standards and has been validated across multiple studies on civilian populations. For most people it's a more practical, faster, free alternative to body composition scales (which can drift 5-8% with hydration changes) and far cheaper than DEXA scans (₹2,500-5,000 per scan).
Pick your gender.
Enter your height.
Measure your neck circumference at the narrowest point, just below the larynx.
Measure your waist at the navel for men, or at the narrowest point for women.
Women only: also measure hip circumference at the widest point.
View your body fat % and category (essential / athlete / fitness / average / obese).
The U.S. Navy uses tape measurements as a body composition standard. The formula correlates these circumferences to body fat % within ±3–4% of more expensive methods like DEXA. It works because excess fat tends to deposit at the waist and hips disproportionately, while the neck stays comparatively constant.
Men: 495 / (1.0324 − 0.19077·log10(W − N) + 0.15456·log10(H)) − 450 Women: 495 / (1.29579 − 0.35004·log10(W + Hip − N) + 0.22100·log10(H)) − 450
The U.S. Navy method exploits the fact that body fat distributes predictably: men accumulate it primarily around the abdomen, women around the hips and abdomen. Neck circumference acts as a relatively fat-resistant reference point. The formula derives body fat percentage from the ratio of waist-to-neck (for men) or (waist + hip)-to-neck (for women), adjusted for total height. The math is logarithmic-based and has been refined over multiple validation studies since the 1980s.
Measurement accuracy is paramount. Use a soft fabric or flexible plastic tape (not a metal carpenter's tape). Measure on bare skin or thin clothing. Exhale normally - don't hold breath or suck in. Neck: at the narrowest point, just below the larynx (Adam's apple), tape level horizontally. Waist (men): at the navel level, tape horizontal, around the widest natural circumference. Waist (women): at the narrowest point of the natural waist, typically just above the navel. Hip (women): at the widest point of the buttocks. Repeat each measurement 3 times and average.
Body fat ranges by gender (for adults aged 20-60): Essential 2-5% (men) / 10-13% (women) - minimum needed for hormonal health. Athletes 6-13% / 14-20%. Fitness 14-17% / 21-24%. Average 18-24% / 25-31%. Obese 25%+ / 32%+. Indian populations tend to carry higher visceral fat at the same total body fat %, so target the fitness range (men 14-17%, women 21-24%) for optimal metabolic health rather than the lower athlete range unless you're actively training.
Body fat ≈ 16.5%. Fitness category - healthy and athletic. Consistent with someone who exercises 3-5 times/week with reasonable nutrition. If goal is fitness modelling or competitive sports, push toward 10-12% via tighter nutrition and consistent training.
Body fat ≈ 27%. Average category - typical for sedentary or lightly active women. Improvement target: 22-24% via 4-6 month structured fat-loss program with resistance training. Lose 4-5 kg of fat without losing muscle by combining moderate caloric deficit with adequate protein.
Within ±3–4% of DEXA in most studies. It is more accurate than BMI for body composition and is one of the better methods you can do at home.
Roughly: men 10–20%, women 18–28% are considered healthy. Athletes are usually lower. Body fat below 5% (men) / 12% (women) is essential fat - going below that is risky for health and hormones.
Use a flexible tape, measure on bare skin, exhale normally. Neck: just below the larynx. Waist: at the navel for men; narrowest point for women. Hips: widest point of the buttocks.
Two people can weigh the same but have very different bodies. Body fat % captures muscle vs. fat composition - what most fitness goals actually target.
Sustainable fat loss is 0.5–1% body fat per month for most people. Faster than that usually means losing muscle along with fat.
Bioelectrical impedance scales can vary by ±5% based on hydration, food intake, and skin temperature. Use them for trends, not absolute numbers.
Body composition, daily energy needs and pregnancy timelines all rest on formulas validated across millions of people, but no single number tells the whole story. The values from this calculator are point estimates with a known margin of error - body fat from skinfold or US Navy method has roughly a ±3% standard error compared to a DEXA scan, and BMR can vary ±10% person to person at the same height and weight. Use these numbers to track trends week over week, not to chase decimal precision day to day.
Pair this tool with the BMR, TDEE, calorie and macro calculators to turn a single measurement into an actionable plan. None of these tools are a substitute for a qualified doctor, registered dietitian or certified strength coach - but they remove the busywork so you spend more time on training and recovery, less on math.
The Body Fat Calculator is part of the Health & Fitness suite on Online Calculator Tools, alongside 6 related calculators. All tools share the same UI patterns, the same privacy-first rendering (nothing is sent to a server), and the same commitment to showing the formula and assumptions behind every result.
