How accurate is the US Navy formula?

The US Navy circumference method has a margin of error of ±3-4% compared to DEXA scan (the gold standard). It is reasonable for tracking trends over time but not for clinical precision.

What is essential body fat?

Essential fat is the minimum fat needed for basic physiological functions. For men it is approximately 3-5%; for women 10-13% (higher due to hormonal and reproductive needs).

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Body Fat Calculator

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Weight (kg)

Age

Height (cm)

Neck circumference (cm)

Waist circumference (cm)

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Estimate body fat using US Navy circumference method, BMI-based formula, or Jackson-Pollock skinfold. Results include body fat %, lean mass, fat mass, and fitness category.

How to Use

1Select a method: US Navy, BMI-Based, or Skinfold
2US Navy method: enter height, neck, waist, and hip (women only) circumferences
3BMI-Based: enter BMI, age, and sex for a quick estimate
4Click Calculate to see body fat %, lean mass, fat mass, and fitness category
5Supported in metric (cm/kg) and imperial (inches/lbs) units

Features

3 methods: US Navy (circumference), BMI-based, simplified skinfold
Body fat %, lean mass, fat mass
Fitness category with sex-specific ranges
Metric and Imperial support
Health disclaimer included
100% browser-based

Body Fat Calculator

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