Body Fat Percentage Calculator

Estimate your body fat percentage using the US Navy method (tape measurements) and the BMI method. Get your fat mass, lean mass, and fitness category.

Body Fat Results

Fill in your measurements and click Calculate.

Body Fat Percentage Categories

Men
CategoryBody Fat %
Essential Fat2–5%
Athletes6–13%
Fitness14–17%
Average18–24%
Obese25%+
Women
CategoryBody Fat %
Essential Fat10–13%
Athletes14–20%
Fitness21–24%
Average25–31%
Obese32%+

Frequently Asked Questions

The US Navy formula has a margin of error of ±3–4% compared to DEXA scanning. It is one of the most accurate field methods available without equipment. Accuracy depends on careful tape measurement — measure at the same time of day, without clothes pulling the tape, and take 3 readings to average.

For men, 14–17% is generally considered fit, and 18–24% is healthy average. For women, 21–24% is fit and 25–31% is average. Essential fat (the minimum for organ function) is 2–5% for men and 10–13% for women. Going below essential fat is dangerous.

BMI doesn't distinguish between fat mass and lean mass. A muscular athlete can have a "obese" BMI while having low body fat. Conversely, a "normal" BMI person can have high body fat (skinny-fat). Body fat percentage directly measures body composition and is a better indicator of health risk and fitness.

Essential fat is the minimum amount of fat required for normal physiological functioning — protecting organs, insulating nerves, regulating hormones, and supporting cell membranes. It represents approximately 2–5% of body weight in men and 10–13% in women (women need more for reproductive function). Storage fat is the additional fat accumulated in adipose tissue, used as an energy reserve. Having some storage fat is normal and healthy; excess storage fat — particularly in the abdominal region — increases risk of metabolic disease. Going below essential fat levels is medically dangerous and requires immediate professional attention.

The American Council on Exercise (ACE) classifies body fat as follows — Men: Essential fat 2–5%, Athletes 6–13%, Fitness 14–17%, Acceptable 18–24%, Obese 25%+. Women: Essential fat 10–13%, Athletes 14–20%, Fitness 21–24%, Acceptable 25–31%, Obese 32%+. These ranges are guidelines; optimal body fat varies with age (it naturally increases slightly with age even at consistent weight) and ethnicity. Consult a healthcare professional to interpret your measurements in context.

The US Navy formula uses tape measurements of neck, waist, and hip circumferences to estimate body fat with a typical margin of error of ±3–4 percentage points. A DEXA scan (Dual-Energy X-ray Absorptiometry) is considered the gold standard for body composition measurement, with an accuracy of ±1–2%, and also distinguishes bone density from fat and lean tissue. Hydrostatic (underwater) weighing and air displacement plethysmography (Bod Pod) are also highly accurate. Skinfold caliper measurements by a trained technician can be comparable to the Navy formula when done correctly. For most people, the Navy formula is a practical and reasonably accurate option without any equipment.

Reducing body fat requires a sustained calorie deficit — burning more energy than you consume — while preserving muscle mass. The most effective approach combines a modest calorie deficit (300–500 kcal/day below TDEE), high protein intake (1.6–2.2 g/kg), and resistance training. Crash diets or extreme calorie restriction cause significant muscle loss along with fat, which lowers BMR and makes long-term fat loss harder to sustain. Cardiovascular exercise accelerates the deficit but is not essential if diet is managed. Realistic progress is 0.5–1% body fat reduction per month. Consult a healthcare professional before starting any fat-loss programme.

Subcutaneous fat lies just beneath the skin and can be pinched — it is the fat you can feel on your arms, thighs, and belly. It is metabolically less active and is associated with fewer health risks. Visceral fat is stored deep in the abdominal cavity, surrounding internal organs like the liver, pancreas, and intestines. Visceral fat is highly metabolically active and releases inflammatory compounds and hormones that increase risk of type 2 diabetes, cardiovascular disease, and certain cancers. Waist circumference is a practical proxy for visceral fat — risk increases above 94 cm for men and 80 cm for women. Visceral fat responds well to aerobic exercise and calorie reduction.

Common body fat measurement methods ranked by accuracy: DEXA scan (±1–2%, gold standard, requires medical equipment); Hydrostatic weighing (±1.5%, highly accurate but requires full-body submersion); Bod Pod / air displacement (±2–3%, non-invasive lab method); US Navy formula (±3–4%, uses tape measurements, free and accessible); Skinfold calipers (±3–5%, depends heavily on technician skill); Bioelectrical impedance (BIA) — used in smart scales and gym equipment (±3–8%, highly variable with hydration and temperature). Smart scales are convenient but inconsistent — use them to track trends rather than absolute values. Consult a healthcare professional to choose the right method for your needs.

Subcutaneous fat sits directly under the skin and is the soft fat you can pinch on your abdomen, thighs, and arms. It serves as an energy reserve and insulation, and while excess subcutaneous fat contributes to obesity, it is primarily a cosmetic concern with moderate metabolic impact. Visceral fat is stored deep in the abdominal cavity, surrounding organs such as the liver, kidneys, and intestines. It is highly metabolically active, releasing hormones and inflammatory cytokines that increase risk of type 2 diabetes, cardiovascular disease, insulin resistance, and certain cancers. Crucially, a person can have a normal BMI yet carry dangerous levels of visceral fat — sometimes called "metabolically obese normal weight." Waist circumference above 94 cm (men) or 80 cm (women) is a warning sign for elevated visceral fat. Aerobic exercise and calorie reduction are the most effective interventions. Consult a healthcare professional for personalised assessment.

About This Body Fat Calculator

This free body fat percentage calculator estimates your body fat using the US Navy method, which requires measurements of height, neck, and waist (and hips for women). No body fat scale or DEXA scan needed — just a flexible tape measure.

Body fat percentage is a more precise indicator of fitness than BMI because it distinguishes between fat mass and lean mass. The US Navy formula is widely used for its simplicity and reasonable accuracy for healthy-weight individuals.

When to use this calculator

  • Tracking fat loss progress alongside scale weight
  • Comparing body composition before and after a training programme
  • Setting a body fat percentage goal in the athletic or fitness range
  • Estimating body fat without specialist equipment

Standards & References

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Macro Calculator
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