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Your Results

Best accuracy with 1-10 reps

What is 1RM?

One-Rep Max (1RM) is the maximum weight you can lift for a single repetition. Knowing your 1RM helps you plan training intensity and track strength progress over time.

Estimation Formulas

BrzyckiMost accurate for 1-10 reps
EpleyGood for higher rep ranges
LanderAlternative formula
LombardiSimple power formula
O'ConnerConservative estimate