One Rep Max Calculator

Calculate your one-rep max for any lift based on weight and reps to plan strength training.

Weight Unit

Kilograms (kg)Pounds (lbs)

Weight Lifted (kg)

Repetitions

About One Rep Max Calculator

Calculate your estimated one-repetition maximum (1RM) using the Epley, Brzycki, and Lombardi formulas. The 1RM is the maximum weight you can lift for one repetition.