Health & Fitness
One-Rep Max Estimate Calculator
Estimate a one-repetition maximum from a lighter set using the Epley formula.
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Formula
Epley one-rep max equals weight lifted multiplied by one plus repetitions divided by 30.
How it works
A submaximal set is scaled up by the Epley factor. It is most reliable for sets of up to about 10 reps; very high-rep sets make the estimate shaky.
FAQs
Is this my real max?
No. It is an estimate, and true maxes vary with technique and fatigue.
Why not just test it?
Testing a true max is risky without coaching and a spotter.
What rep range works best?
Sets of 3 to 10 reps give the most useful estimates.
General information only, not medical advice.