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`1 RM = \frac{100* "w" }{52.2+41.9*e^{-0.055* "r" }}`

Enter a value for all fields

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.

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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