One Rep Max Calculator
Estimate your one-rep max (1RM) from a weight you lifted for several reps, with a percentage training table.
About the One Rep Max Calculator
Epley formula: 1RM = weight × (1 + reps/30). Brzycki: weight × 36/(37 - reps). Estimates are most accurate below 10 reps. Training percentages: 5x5 strength work around 80-85%, hypertrophy around 65-75%.