The Mayhew Max Weight calculator computes the approximate one repetition maximum weight one can lift using the Mayhew formula.
INSTRUCTIONS: Choose units and enter the following:
- (w) Weight Lifted in Repetition
- (r) Number of Reps
Max Weight (1RM): The calculator returns the approximate max weight in pounds. However, this can be automatically converted to other mass or weight units (e.g. kilograms) via the pull-down menu.
Math / Science
The Mayhew Max Weight formula is:
`1RM = (100*w)/(52.2+41.9*e^(-0.055*r))`
where:
- 1RM = One repetition maximum
- w = weight lifted in multiple reps
- r = number of reps
Max Repetition Weight formulas like Mayhew are intended to provide an estimate on the maximum weight one can lift without having to attempt such a lift. The motivation is to avoid injuries associated with lifting one's max.
https://en.wikipedia.org/wiki/One-repetition_maximum
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