One Rep Max Calculator
Calculate one rep max — strength training calculator.
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Estimated 1RM
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Strength Ratio
Recent Calculations
What Is One Rep Max?
One Rep Max estimates your one-rep max from submaximal lifts using the Epley formula.
Formula
1RM = Weight × (1 + Reps/30)Frequently Asked Questions
How accurate is this?
The Epley formula is most accurate for 1-10 reps. Higher rep ranges are less reliable.