The Epley Formula
Estimating 1RM:
1 Rep Max = Weight Lifted x Coefficient
Coefficients for each rep count:
reps performed multiplication coefficient
1
1.000
2
1.066
3
1.099
4
1.132
5
1.165
6
1.198
7
1.231
8
1.264
9
1.297
10
1.330