1RM Calculator
Estimate your one-repetition maximum (1RM) from a submaximal set using the Epley equation, then translate that estimate into common training percentages.
Use a technically sound set performed close to failure, preferably in a moderate rep range. Predictions become less dependable when very high-repetition sets are used.
Estimate your 1RM
What estimated 1RM is good for
It gives you a repeatable strength marker without maximal testing every week. It can help track performance trends, compare sets performed at different rep counts and choose rough loading zones.
What it cannot tell you
An estimated 1RM is not the same as a tested 1RM. Exercise technique, rep speed, fatigue, range of motion and proximity to failure all influence the prediction. For hypertrophy, you also do not need to train at a particular percentage of 1RM for every exercise.