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
Protein Intake Calculator
Estimate daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective.
Fill in the required fields to see your result.
Key differences
| One Rep Max Calculator | Protein Intake Calculator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 4 | 3 |
| Result | Estimated Weight (kg) | Daily Protein Needed (g) |
| 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 daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective. |