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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**) This is the weight lifted in repetitions. - (
**r**) This is the number of reps.

**Max Weight:** 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.

- Epley Formula one repetition max weight
- Brzycki Formula one repetition max weight
- Lander's Formula one repetition max weight
- Mayhew Formula one repetition max weight
- Lombardi Formula one repetition max weight
- Wathen Formula one repetition max weight
- O'Conner's Formula one repetition max weight
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