One Rep Max Calculator
Estimate your 1 Rep Max (1RM) for weightlifting. Use the Epley and Brzycki formulas to train safely.
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Applications
Used by powerlifters and athletes to structure their training program. It allows you to estimate your maximum strength without risking injury by lifting to failure.
The Common Formulas
Epley Formula: 1RM = weight × (1 + reps/30) . Brzycki Formula: 1RM = weight / (1.0278 - 0.0278 × reps) .
Fun Fact: The world record for the heaviest deadlift is currently over 500kg (1,102 lbs)!
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