1RM Estimation
Use this section to indirectly estimate your One-repetition maximum (one-rep max or 1RM) using repetition testing on submaximal loads. Because testing for 1RM is very arduous on the nervous system, and because of the heavy loads involved, it can be dangerous to do a true 1RM assessment, especially for newer lifters. Because of this, using submaximal loads such as 3RM or 5RM and then converting that load to 1RM is safer, although less accurate. It's not recommended to estimate the 1RM based on more than five repetitions as the estimation gets less and less accurate with increasing amount of repetitions.
The calculator below uses two popular formulas for estimating 1RM : Epley's and Brzyscki's. According to Wikipedia, Epley and Brzycki return identical results for 10 repetitions. However, for fewer than 10 reps, Epley returns a slightly higher estimated maximum.
Load Percentages
Use this section to quickly convert your One Repetition Max (1RM) to various load percentages.