Estimated 1 Rep Max
208
LB
Training Percentages
Formula Comparison
Primary result uses Epley formula. All results rounded to nearest achievable weight.
Estimate your one rep max from any set
Primary result uses Epley formula. All results rounded to nearest achievable weight.
One rep max (1RM) calculators use submaximal performance data to estimate the maximum weight you could lift for a single repetition. This is safer than actually testing your true 1RM, which carries injury risk.
The most accurate predictions come from sets of 3-6 reps. Higher rep sets (10+) become less reliable as muscular endurance plays a larger role than maximum strength.
Many programs (like 5/3/1) recommend using a "training max" of 85-90% of your true 1RM for programming. This builds in a buffer for bad days and allows for sustainable progress.
Training Max = Estimated 1RM × 0.90