What is My One Rep Max?

What is One Rep Max (1RM)?

Your One Rep Max (1RM) is the maximum weight you can lift for a single repetition with proper form. It's used to program training intensity — for example, working at 70-85% of your 1RM for hypertrophy or 85-95% for strength. These formulas estimate your 1RM from submaximal lifts, so you don't need to attempt a true max.