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One Rep Max (1RM) Calculator
Calculate your estimated one-rep max for any strength exercise.
About This Calculator
The Brzycki formula is most accurate for sets of 1–10 reps; accuracy declines for higher rep ranges. A beginner bench press 1RM of 135 lbs is average for a 170-lb man; intermediate is 175–200 lbs; advanced 250+ lbs. World record raw bench press is 739 lbs (Julius Maddox, 2020).