Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Fitness
One Rep Max Calculator
Estimate your one-rep maximum (1RM) — the maximum weight you can lift for a single repetition — from a submaximal set using Epley, Brzycki, Lander, or other established formulas. Use it to design strength-training programs without the injury risk of testing actual maxes.
Fill in the required fields to see your result.
Fitness
Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy circumference method (waist, neck, and for women hip measurements). Use it as a no-equipment-needed alternative to skinfold calipers, BIA, or DEXA for tracking body composition trends.
Fill in the required fields to see your result.
Key differences
| One Rep Max Calculator | Body Fat Percentage Calculator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 4 | 5 |
| Result | Estimated Weight (kg) | Body Fat Percentage (%) |
| What it does | Estimate your one-rep maximum (1RM) — the maximum weight you can lift for a single repetition — from a submaximal set using Epley, Brzycki, Lander, or other established formulas. Use it to design strength-training programs without the injury risk of testing actual maxes. | Estimate body fat percentage using the US Navy circumference method (waist, neck, and for women hip measurements). Use it as a no-equipment-needed alternative to skinfold calipers, BIA, or DEXA for tracking body composition trends. |