Health & Fitness
Estimate your one-rep max using the Epley formula
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Estimated One Rep Max (1RM)
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About the Epley Formula
The Epley formula (1RM = weight x (1 + reps/30)) is one of the most widely used equations for estimating one-rep max. It works best for rep ranges between 2-10. For best results, use a weight you can lift for 3-8 reps with good form.
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We check One Rep Max Calculator periodically to keep it working correctly and to make small improvements based on how people actually use it. The date at the top of the page shows the last review. Found a bug or have a suggestion? There's a feedback button in the bottom-right corner.