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`MaxWeight = 100* "w" /(101.3- 2.67123* "r" )`

Enter a value for all fields

The **Lander's Max Weight** calculator computes the approximate maximum weight one can lift using the Lander's 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.

The Lander's One Rep Max formula is:

`1RM = w/(1.013 - (0.0267123*r))`

where:

- 1RM is the one rep maximum
- w is the weight lifted in multiple reps
- r is the number of reps

Max Repetition Weight formulas like Lander's 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.

This is a derivation of the One-Rep Max calculation

*J Lander*

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