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`1RM = (100* w )/(48.8+53.8e^(-0.075* r ))`

Enter a value for all fields

The **Wathen Max Weight** calculator computes the approximate maximum weight one can lift using the Wathen formula.

**INSTRUCTIONS:** Choose your preferred units and enter the following:

- (
**w**) Weight Lifted in Repetitions. - (
**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.

Max Repetition Weight formulas like Wathen 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. The Wathen One Max Weight formula is:

1RM = (100*w) / (48.8 + (53.8*(E**((-1)*0.075*r))) )

where:

- 1RM = One Rep Maximum, the approximate limit that could be lifted once.
- w = weight lifted in multiple repetitions
- r = number of repetitions lifting weight w.

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