Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Fitness
Army Body Fat Calculator
Estimate body-fat percentage using the U.S. Army circumference-based method (AR 600-9). Uses neck, waist, height for men, and neck, waist, hips, height for women.
Fill in the required fields to see your result.
Weight Loss
Lean Body Mass Calculator
Calculates your lean body mass — the weight of everything except body fat — using your choice of three validated clinical formulas. Useful for setting protein targets, dosing medications by lean mass, or tracking body composition changes over time.
Fill in the required fields to see your result.
Key differences
| Army Body Fat Calculator | Lean Body Mass Calculator | |
|---|---|---|
| Category | Fitness | Weight Loss |
| Inputs required | 5 | 4 |
| Result | Body-fat percentage (%) | Lean Body Mass (lbs) |
| What it does | Estimate body-fat percentage using the U.S. Army circumference-based method (AR 600-9). Uses neck, waist, height for men, and neck, waist, hips, height for women. | Calculates your lean body mass — the weight of everything except body fat — using your choice of three validated clinical formulas. Useful for setting protein targets, dosing medications by lean mass, or tracking body composition changes over time. |