Overview
What Is a Body Fat Calculator?
This tool estimates body fat percentage using the US Navy circumference method, which uses waist, neck, and (for women) hip measurements.
Estimate your body fat percentage instantly.
This tool estimates body fat percentage using the US Navy circumference method, which uses waist, neck, and (for women) hip measurements.
Useful for tracking body composition changes over time, alongside or instead of BMI.
Input waist, neck, and (for women) hip circumference.
Input your height and select your sex.
The result updates automatically.
It's a reasonably accurate estimate for most people, though less precise than clinical methods like DEXA scans.
This varies by sex and age - generally 10-20% for men and 18-28% for women is considered a healthy range, though standards vary.
Women naturally carry different fat distribution, so the formula includes hip measurement for women, which isn't used for men.
Measure consistently in either inches or centimeters as prompted by the calculator.
Measure at the narrowest point, typically at the navel, without holding your breath.
No, this uses circumference measurements rather than skinfold calipers - both are estimation methods with different accuracy tradeoffs.
Yes, consistent measurement technique makes this useful for tracking trends, even if the absolute number isn't perfectly precise.
It works reasonably well for most people, though very muscular individuals may see some estimation error.
No, calculations happen entirely in your browser.
Yes, completely free with no sign-up required.