One Rep Max Calculator

Weight Lifted

Reps Performed

 

One-rep max
50% 1 RM
55% 1 RM
60% 1 RM
65% 1 RM
70% 1 RM
75% 1 RM
80% 1 RM
85% 1 RM
90% 1 RM
95% 1 RM

Enter "Weight Lifted" and "Reps Performed". The repetitions must be between 1 and 10. Press "Calculate" for the weight you may be able to perform for a single repetition.

 


 

Brzycki, M. Strength testing: Predicting a one-rep max from a reps-to-fatigue
Journal of Physical Education, Recreation and Dance 64 (1): 88-90, 1993.

Reprinted with permission from ExRx.net James Griffing, 6-17-2004