How the One Rep Max Calculator works
Testing a true one-rep max is risky and rarely necessary. A hard set of three to eight reps predicts it accurately enough to program from, without the injury exposure.
Epley: 1RM = weight × (1 + reps ÷ 30).
One Rep Max Calculator
Estimate your one-rep max from a set at a lighter weight, plus training percentages.
Read the full One Rep Max Calculator guide →