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One-Rep Max Calculator
Estimate your 1RM from any lift (Epley formula).
Enter your details
Results
Estimated 1RM
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90% of 1RM
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80% of 1RM
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How to use the One-Rep Max Calculator
Enter the weight you lifted and clean reps to estimate your one-rep max and training percentages.
Frequently Asked Questions
Epley: 1RM = weight × (1 + reps/30). Most accurate for 1–10 reps.