📐 Body Fat Calculator

Gender

Age (years)

Body Measurements (cm)

Height (cm)

Weight (kg)

Waist Circumference (cm)

Neck Circumference (cm)

Hip Circumference (cm) (females)

📈 Results

Body Fat Percentage

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Fat Mass

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Lean Mass

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Fat to Lose (ideal)

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Ideal Body Fat %

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Body Composition

Fitness Category

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Enter your measurements to estimate body fat

About

Body Fat Percentage Categories

Men

Category	Body Fat %
Essential Fat	2–5%
Athletes	6–13%
Fitness	14–17%
Average	18–24%
Obese	25%+

Women

Category	Body Fat %
Essential Fat	10–13%
Athletes	14–20%
Fitness	21–24%
Average	25–31%
Obese	32%+

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US Navy Method

Uses circumference measurements to estimate body density and derive body fat %. It's more accurate than BMI for assessing body composition, especially for muscular individuals. Accuracy is ±3-4%.

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Measurement Tips

Measure waist at navel level after normal exhale. Measure neck below the larynx. Measure hips (women) at widest point. Take measurements twice and average them. Use a non-stretch measuring tape for best accuracy.

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Essential Fat

Essential fat is the minimum needed for normal physiological function. Going below this threshold — common in extreme cutting phases — causes hormonal disruption, immune suppression, and organ dysfunction. Never go below essential fat levels.

FAQ

Frequently Asked Questions

Common questions about Body Fat calculations

How accurate is the Navy body fat method?

The US Navy method has an accuracy of approximately ±3-4% compared to DEXA scans (the gold standard). It tends to overestimate body fat in lean individuals and underestimate in obese individuals. For most people, it provides a useful estimate for tracking trends over time, even if the absolute value may be slightly off.

What is better for measuring body fat — Navy method or BMI?

The Navy circumference method is generally more accurate than BMI for body composition assessment. BMI can't distinguish between muscle and fat, so muscular individuals may have a "overweight" BMI while having low body fat. The Navy method directly estimates fat mass. DEXA scans, hydrostatic weighing, and Bod Pod offer higher accuracy but require special equipment.

How can I reduce my body fat percentage?

Effective strategies: maintain a modest caloric deficit (300-500 kcal/day), prioritize high-protein intake (1.6-2.2g/kg) to preserve muscle, combine cardio with resistance training, get adequate sleep (7-9 hours), and be consistent over months rather than seeking rapid results. Spot reduction is a myth — fat loss is systemic.

Why do women have higher body fat than men naturally?

Women have higher essential fat (10-13% vs 2-5%) due to hormonal needs, reproductive function, and breast tissue. Estrogen promotes fat storage in specific areas (hips, thighs, breasts). This is physiologically normal and healthy — comparing a woman's body fat to a man's standards is not appropriate or healthy.