One Rep Max Calculator
Safely estimate your One Rep Max (1RM) using Epley, Brzycki, and Lander formulas with a 11-row workout intensity table.
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Quick Summary: One Rep Max Calculator
One Rep Max (1RM) is the maximum weight you can lift once in FY 2026-27. To avoid injury, use the Epley formula [1RM = Weight * (1 + reps/30)] based on a higher rep set to safely plan your training loads.
How to use the One Rep Max Calculator
- 1
Enter Lift
Input the weight you lifted and the number of repetitions completed (up to 12).
- 2
Review Maxes
The tool shows your estimated 1RM using multiple validated formulas (Epley, Brzycki, Lander).
- 3
Plan Training
Use the scannable percentage table to find your training loads (e.g., 75% of 1RM for hypertrophy).