Lander's Formula

Not Reviewed
Equation / Last modified by KurtHeckman on 2018/08/29 23:25
cjlynch.Lander's Formula

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.

Math / Science

The Lander's One Rep Max formula is:

   `1RM = w/(1.013 - (0.0267123*r))`


  • 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

2d15b85.jpgJ Lander 

Weight Lifting Calculators