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`1RM = "w" ( 1 + "r" /30)`

Enter a value for all fields

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 weight units and enter the following:

- (
**w**) This is the weight lifted. - (
**r**) This is the number of repetitions achieved.

**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 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)

The 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.

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