247SportTools
Fitness · Strength

One Rep Max Calculator

Estimate your 1RM from a set, and get your full percentage training table.

Estimate your 1RM

Estimated 1RM (Epley)

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Frequently asked questions

How many reps give the best estimate?

Sets of 3–6 reps give the most accurate 1RM estimates. Above ~10 reps, accuracy drops sharply.