One Rep Max Calculator calculates your one rep maximum and stores your one rep maximum records. Features: Lifts: Enter the lifts you use with the Lift Name Editor. Calculator: 7 selectable methods calculated: Brzycki, Epley, Lander, Lombardi, Mayhew, Oconner, and Watham. Scales your one rep maximum between 50% and 100%. Displays average for each formula and scaled value.