CalcLifting

What Does the 1RM Calculator Calculate?

The 1RM calculator estimates your one rep max, the heaviest weight you could lift for a single rep in an exercise like the bench press, squat, or deadlift. Instead of risking injury by testing a true max lift, this tool uses the weight and reps you already completed to predict your one rep max through a proven strength training formula.

Who Should Use This Tool?

This calculator is built for lifters at any stage of their strength training journey. Beginners can use it to understand where their current strength level stands without attempting a risky max lift. Intermediate and advanced lifters rely on it to set percentage of 1RM training zones for hypertrophy, strength, or peaking phases. Powerlifters and competitive athletes use it before meets to estimate attempts.

How To Use This Tool?

Enter the exact weight you lifted for an exercise such as the bench press, squat, or deadlift, then enter the number of reps you completed with good form, ideally between 1 and 10 reps for accuracy. The calculator applies the Epley formula, one of the most widely used equations in strength training, to convert your submaximal lift into an estimated one rep max.