Body Fat Tape Measure Calculator (YMCA Method)
Quick body fat estimate from weight and waist.
Enter your values
ⓘ Live results
Results
- Estimated body fat
- 16.1%
Quick answer
The YMCA formula estimates body fat percentage from body weight and waist circumference alone.
Men: %BF = (-98.42+4.15xwaist-0.082xweight)/weight x100; Women differs
How to use the Body Fat Tape Measure Calculator (YMCA Method)
- 1Measure waist circumference in inches at the navel and enter body weight in pounds.
- 2This quick method trades precision for convenience — treat the result as a rough guide.
- 3Track the trend over time rather than relying on a single reading.
Worked example
Using the values the calculator loads with:
Inputs
- SexMale
- Waist (in inches)34 in
- Weight176 lb
Results
- Estimated body fat16.1%
Frequently asked questions
Is this as accurate as calipers?
No, it's less precise but useful for quick tracking without equipment.
Metric units?
Convert cm to inches (÷2.54) and kg to lb (×2.205) before entering.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.