🏋 One Rep Max (1RM) Calculator
Calculate your estimated one-rep max using the Epley and Brzycki formulas, then get a full training percentage table.
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About One Rep Max Formulas
The Epley formula (1985) estimates 1RM as: weight × (1 + reps / 30). It tends to be slightly more generous at higher rep counts.
The Brzycki formula calculates: weight / (1.0278 − 0.0278 × reps). It is considered most accurate for sets of 2–10 reps and becomes less reliable above 10 reps.
These are estimates. Never attempt a true 1RM without a spotter and adequate warm-up. Use the percentage table for programming sub-maximal training loads.