One Rep Max Calculator – Calculate Your 1RM

Calculate your one rep max based on the reps and weight you lifted today

Calculated One Rep Max:

 
95%:?70%:?
90%:?65%:?
85%:?60%:?
80%:?55%:?
75%:?50%:?
Calculated using the Brzycki formula [1]


Weight percentage of one rep max for max repetitions
Percent of 1RM Max Reps
100% 1RM
95% 2RM
93% 3RM
90% 4RM
87% 5RM
85% 6RM
83% 7RM
80% 8RM
77% 9RM
75% 10RM
73% 11RM
70% 12RM

References

  1. Brzycki, Matt, Strength Testing – Predicting a One-Rep Max from Reps-to-Fatigue, The Journal of Physical Education, Recreation & Dance, 1993, 64.1, 88-90.