1RM Calculator

Estimate your one rep max using proven strength training formulas

Input Your Lift Data

Enter your details below to estimate your one rep max

Body Weight

Unit

Exercise

Weight Lifted (lbs)

Repetitions

This calculator uses the Epley, Brzycki, and Lombardi formulas to estimate your one rep max. Results are most accurate for 1-10 reps. Always lift with proper form and use a spotter for heavy lifts.