One Rep Max Calculator

Use this calculator to determine what your predicted one rep max should be. The calculator uses various formulae such as the Brzycki formula and takes the average of them all to give you a predicted range.

Simply input the amount of reps you have recently completed for a given weight and the calculator will do the rest!

If you’re a bit of a math whiz and want to look under the hood of the calculator, you can check out more detailed information on the formulas used if you’d like.

For more information on the one rep max in general, check out my Beginner’s Guide.