Rep Converter Calculator

What is a Rep Converter?

A rep converter or one-rep max calculator helps you estimate the maximum amount of weight you can lift for one repetition of an exercise. It's a valuable tool for lifters and coaches to program training intensity and progression. Enter the weight and number of reps you've performed to estimate your 1RM.

What is the Lombardi Formula?

The Lombardi formula is a widely used method to estimate your one-rep max (1RM) based on the amount of weight lifted and the number of repetitions performed. Unlike other formulas, Lombardi accounts for how strength scales with reps using an exponential relationship:

Formula:

1RM = Weight × (Reps ^ 0.10)

This method tends to be more conservative at higher rep ranges, making it a reliable option for estimating max strength—especially for experienced lifters or coaches looking for consistency in progressive overload planning.