One Rep Max Calculator
Estimate your 1RM from any weight and rep count using 5 formulas.
Details
Result
Estimated 1RM
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Epley formula—
Brzycki formula—
Lombardi formula—
60% 1RM (endurance)—
75% 1RM (hypertrophy)—
85% 1RM (strength)—
Your one-rep max (1RM) is the maximum weight you can lift for one full repetition. The most accurate formulas use sets of 3–5 reps. These are estimates — never attempt a true 1RM without a spotter. Use the percentages to program your training: 60% for muscular endurance, 75–85% for hypertrophy, 85–95% for strength.