📐 Body Fat Calculator

Gender

Age (years)

Body Measurements (cm)

Height (cm)

Height

Weight (kg)

Waist (cm)

Neck (cm)

Hip (cm) (females)

📏 For US Navy method accuracy, measure waist at navel level after a normal exhale — not the narrowest point or the midpoint used in WHO/NHS clinical guidelines. Using a different reference point will skew your result.

📈 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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Estimate only. Consult a healthcare professional before changing your diet or exercise routine. Ideal ranges also vary by age — older adults naturally carry more body fat.

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

Show categories for age group:

Men

Category	Body Fat %

Women

Category	Body Fat %

⚠️ Categories based on ACE (American Council on Exercise) standards, with age-group adjustments from ACSM clinical norms. Asian populations may have higher metabolic health risks at lower body fat percentages — similar to the well-known BMI Asian cutoff effect. Consult a healthcare provider for a personalised assessment.

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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 a normal exhale — this is the US Navy protocol, which differs from WHO/NHS guidelines that use the midpoint between the lowest rib and hip bone. Measure neck below the larynx. Measure hips (women) at the widest point. Take measurements twice and average them.

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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 an "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), prioritise high-protein intake (1.6–2.2 g/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.

Do body fat categories change with age?

Yes. Body fat naturally increases with age as muscle mass declines (sarcopenia) and metabolic rate slows. ACSM clinical norms raise the obese threshold for older adults — men over 60 are considered obese at 30%+ vs 25%+ for younger men. Use the age group filter on the category table above to see age-adjusted ranges for your group.