Body fat
-
Body Fat Calculator
Estimate body fat percentage with height and body measurements, then compare fat mass and lean mass in one quick check.
Choose sex and enter your measurements to begin.
Category
-
Fat mass
-
Lean mass
-
Quick health notes
- Body-fat percentage adds context beyond BMI. It helps you distinguish body fat from total body weight alone.
- This tool uses the U.S. Navy method. It is useful for a quick estimate, but it is still an estimate, not a scan.
- Measure consistently. Similar timing and body position matter if you want useful comparisons over time.
How to use this tool
- Select sex, then enter height, weight, neck, and waist. Women also need hip circumference.
- Click Calculate to estimate body-fat percentage and see the category.
- Use fat mass and lean mass as simple tracking references, especially if BMI alone feels incomplete.
FAQ
What is the difference between body-fat percentage and BMI?
BMI is a quick reference based on height and weight, but it cannot tell whether that weight comes more from fat or muscle. Body-fat percentage estimates how much of your body weight is fat, so it adds body-composition context that BMI cannot show on its own. In practice, the two work better together than separately.
How accurate is this body-fat estimate?
This tool uses the U.S. Navy method, which is useful for quick personal estimates and trend tracking, but it is not a medical-grade test. Measurement technique, timing, and small circumference errors can all affect the result, so it is better used for consistency over time than as an absolute one-time number.
When is the best time to take these measurements?
If you want results that are easier to compare over time, measure under similar conditions each time, such as the same time of day, before eating, and with a consistent method for neck, waist, and hip measurements. That usually matters more than chasing a single perfect reading.
What should I check after estimating body fat?
If you want a broader body-metric view, add BMI or waist-to-height ratio. If your next goal is fat loss, weight control, or nutrition planning, the usual next step is to estimate BMR / TDEE and then set a daily calorie target.
Want the basics first?
If you want a simpler explanation of BMI, TDEE, calories, and protein before using the tools, start here.
BROWSE MORE