1RM Calculator
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Reps
1RM formulas are less accurate above 10 reps
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Estimated One-Rep Max
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Formula: Average (recommended)
Formula: Epley
Formula: Brzycki
Formula: Mayhew
Formula: Lombardi
Formula: Wathen
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To Achieve
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
of 1RM