One Rep Max Calculator
Calculate your estimated one-rep max (1RM) and training percentages using Epley, Brzycki, and Lombardi formulas.
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About 1RM Estimation
One Rep Max (1RM) is the maximum weight you can lift for a single repetition. Formulas estimate it from submaximal lifts. Epley and Brzycki are the most popular. Accuracy decreases above 10 reps. Training percentages help program sets and reps for different goals: strength (85-95%), hypertrophy (70-85%), endurance (60-70%).