Body Fat Calculator

Body fat percentage is a far better indicator of health and fitness than weight alone. Our free body fat calculator uses the US Navy circumference method — a formula validated against hydrostatic weighing — to estimate your body fat from simple tape measurements. No equipment needed beyond a flexible tape measure.

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Height (cm)

Weight (kg)

Neck Circumference (cm)

Waist Circumference (cm)

About this calculator

This calculator uses the U.S. Navy circumference method to estimate body fat percentage. While reasonably accurate for most people, it is an estimate and may not be as precise as methods like DEXA scans or hydrostatic weighing. Results should be used as a general guide, not a medical diagnosis. Consult a healthcare professional for personalised advice.

Body Composition Tools

Body fat callipers, smart scales with body composition analysis, and flexible measuring tapes for accurate at-home tracking.

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Frequently Asked Questions

How accurate is the US Navy body fat method?

The US Navy circumference method is accurate to within 3-4% of body fat compared to hydrostatic weighing for most people. It is more reliable than BMI and is used by the US military for fitness assessments.

What is a healthy body fat percentage?

For men, 10-20% is generally considered healthy, with 14-17% being the fitness range. For women, 18-28% is healthy, with 21-24% being the fitness range. Essential fat is about 2-5% for men and 10-13% for women.

Where do I measure for the Navy body fat formula?

Measure your neck circumference just below the larynx, your waist at the narrowest point (navel level for men), and your hips at the widest point (women only). Use a flexible tape measure pulled snug but not compressing the skin.

Why is body fat percentage better than BMI?

BMI does not distinguish between muscle and fat. A muscular athlete may have a high BMI but low body fat, while a sedentary person may have a normal BMI but high body fat. Body fat percentage directly measures adiposity.

How often should I measure body fat?

Measure every 2-4 weeks to track trends. Measure at the same time of day (morning is best) under consistent conditions. Focus on trends over weeks rather than day-to-day fluctuations.

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