The Epley 1 Rep Max Formula calculator computes the one repetition max using the Epley formula, the weight lifted and the number of repetitions.
INSTRUCTIONS: Choose units and enter the following:
- (w) Weight of Lifted Reps
- (r) Number of Reps Lifted
One Rep Max (1RM): The calculator returns the One Repetition Maximum in pounds. However, this can be automatically converted to other weight units (e.g. kilograms) via the pull-down menu.
The Math / Science
The Epley 1 Rep Max formula estimates how much the weight lifter could have lifted one time (RM) based on the maximum number of reps (r) of a lesser weight (w). This method is used in some competitions and in many gyms to avoid injuries and to provide a more consistent measure of endurance and strength. The Epley Formula for one repetition max is as follows:
where:
- 1RM is the Epley formula one repetition maximum
- w is the weight lifted
- r is the number of times lifted (reps)
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