What is Body Fat Calculator?
Calculates body fat percentage with the US Navy formula from your height and neck and waist measurements (plus hips for women), and compares it with a BMI-based estimate. It also shows fat mass, lean mass (muscle, bone, water) and a category from athletes to obese.
How to use
- 1
Enter your sex, height, weight and age.
- 2
Measure and enter your neck, waist (and hips).
- 3
Check your body fat percentage and category.
Use cases
Home workout log
Track changes in body fat before and after a month of training.
Beyond the scale
See whether you lost fat even though your weight stayed the same.
FAQ
Is the information I enter saved?+
No. All calculations happen in your browser and nothing is stored or sent anywhere.