One Rep Max Calculator
Calculate your estimated 1RM and training weights for any lift
Calculate Your 1RM
What is 1RM?
Your One Rep Max (1RM) is the maximum weight you can lift for a single repetition of a given exercise. It's a key metric for strength training and program design.
These calculations provide estimates based on submaximal lifts. For safety, always use a spotter when attempting true 1RM lifts.
Log every PR attempt alongside this 1RM estimate with PrepSmart for intelligent meal prep planning.