Free tool

1RM Calculator (One-Rep Max)

Your 1RM is the maximum weight you could lift for a single rep. Instead of risking an actual max attempt, this calculator estimates it from a weight and a rep count you already did, using the Epley formula.

This is a mathematical estimate, not a target to lift without supervision. It doesn't replace professional advice: if you're starting out or have an injury, check in before training near your max.