Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method.
US Navy method
This method estimates body fat using circumference measurements. It is a good approximation but may not be as accurate as DEXA scans or caliper measurements.
What is Body Fat Calculator?
A body fat calculator estimates your body fat percentage using the US Navy method, which requires only waist, neck, and hip measurements.
Body fat percentage is a better health indicator than weight alone — it shows your body composition.
How does the Body Fat Calculator work?
The US Navy formula uses circumference measurements and height.
The calculator also shows your fat mass, lean mass, and a category rating (athletic, fit, average, obese).
How to use the Body Fat Calculator?
- Enter your gender, height, and weight.
- Enter your waist, neck, and hip (women) measurements.
- The calculator shows your body fat percentage and category.
Example
Try the calculator with your own numbers
- Enter your values in the input fields above.
- Adjust the values to match your situation.
- The result updates instantly as you change the inputs.
Benefits of using the Body Fat Calculator
- Track body composition, not just weight.
- Set realistic fitness goals.
- Monitor progress beyond the scale.
Who should use the Body Fat Calculator?
- People tracking their weight, fitness, and daily health numbers.
- Fitness enthusiasts planning workouts, calories, and protein intake.
- Parents monitoring their child's growth and development.
- Anyone preparing for a health check-up or fitness goal.
Tips for getting the most out of the Body Fat Calculator
- Use your most recent measurements for the most accurate result.
- Re-check periodically as your weight, age, or activity level changes.
- Treat the result as a guideline, not a medical diagnosis — consult a professional for health decisions.
Frequently Asked Questions
What is a healthy body fat percentage?
For men, 10-20% is healthy; for women, 18-28%. Athletes are typically lower.
How accurate is the US Navy method?
It is within about 3-4% of DEXA scans for most people, making it a good free estimate.
Small daily decisions add up. Use this calculator to track your numbers and make healthier choices with confidence.
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