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Testing a true one-rep max is one of the riskiest things you can do in a gym β no spotter, one rep, everything on the line. Yet you need the number to program intelligently. The Epley formula solves that: it estimates your 1RM from a sub-maximal set you can do safely, using the relationship between reps and fatigue. This calculator also gives you the 90% training max, the number you should actually program from.
Estimate your one-rep max from a heavier set of 3-12 reps using the Epley formula β without risking a max-out attempt.
Within a few percent for sets of 3-12 reps in most lifters. Above 12 reps it overestimates β that rep range is endurance, not strength.
No β program from the 90% training max. It gives you recovery room and lets you add weight weekly instead of grinding near-fail singles.
A decent male benchmark is a bodyweight bench press, 1.5x bodyweight squat and 2x deadlift. Compare lifts to bodyweight, not to other people's numbers.
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