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Body Fat Calculator

Estimate body fat percentage using the US Navy circumference method

Sex

Male Female

How to measure correctlyWaist: at navel level. Neck: just below larynx. Hip (women): widest point. All in cm.

Height (cm)

Weight (kg)

Waist (cm)

Neck (cm)

Hip (cm) — women only

About Body Fat Calculator

Body Fat Calculator is a free health and wellness calculator that helps you estimate body fat percentage using the us navy circumference method. Understanding your body's metrics is the first step toward making informed health decisions. This tool uses clinically recognized formulas to provide instant, accurate estimates — though always consult a healthcare professional for medical advice.

How to Use

Enter your measurements Fill in the required fields such as age, height, weight, or other health metrics.

Choose your unit system Select metric (kg, cm) or imperial (lbs, ft/in) depending on your preference.

View your results See your calculated results with color-coded categories, ranges, and clear explanations.

Understand the context Read the category descriptions and healthy ranges to understand what your results mean.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use Body Fat Calculator?

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Evidence-Based Formulas Body Fat Calculator uses clinically recognized formulas and guidelines from organizations like the WHO, CDC, and peer-reviewed medical research.

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Health Data Privacy Your body measurements, health metrics, and personal data are processed entirely in your browser. Nothing is stored, shared, or transmitted.

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Visual Results Clear charts, color-coded ranges, and contextual explanations help you understand your results at a glance — not just a raw number.

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Educational Tool This calculator provides estimates for educational purposes. Always consult a qualified healthcare professional for medical decisions and diagnoses.

Frequently Asked Questions

Healthy ranges differ by sex. For men: Essential (2–5%), Athletes (6–13%), Fitness (14–17%), Acceptable (18–24%), Obese (25%+). For women: Essential (10–13%), Athletes (14–20%), Fitness (21–24%), Acceptable (25–31%), Obese (32%+). Note these are general guidelines and individual health factors matter.

The US Navy circumference method has a margin of error of about ±3–4% compared to DEXA scans (the gold standard). It's reasonably accurate for tracking changes over time but may overestimate or underestimate for very lean or very obese individuals. It's an excellent free, equipment-free estimate.

Combine a moderate calorie deficit (300–500 kcal/day below TDEE) with resistance training to preserve muscle mass. Prioritize protein (1.6–2.2g per kg bodyweight), get adequate sleep (7–9 hours), and manage stress. Aim for 0.5–1% body fat loss per month for sustainable results.