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One Rep Max (1RM) Calculator

1MR - One Rep Max Calculator

One Rep Max Calculator

Numerous routines and training plans often request you determine your one-repetition maximum weight, or the maximum amount of weight you can possibly lift for one rep in an exercise, and then determine a percentage of this to use as a starting point for that exercise. The following calculator utilizes the Brzycki Formula developed by Matt Brzycki to determine your one rep max and generates an associated table of percentages.

Select Units: 

Enter the Weight you Lifted:   lbs  

Select Reps for that Weight: 



One Rep Max: