◑ HEALTH Updated July 25, 2026

One Rep Max Calculator

Turn a working set into a reliable one-rep-max and training loads.

Weight lifted
Reps completed
Result
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How it works

The tool averages the Epley and Brzycki formulas, which both extrapolate a single-rep maximum from a submaximal set, then applies standard training percentages for strength, hypertrophy and endurance work.

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Frequently asked questions

How accurate is an estimated 1RM?

It is closest for sets of 2 to 6 reps; beyond about 10 reps fatigue makes any estimate less reliable.

Do I need to test a real 1RM?

No. Most lifters get everything they need from an estimate, without the injury risk of a true maximal attempt.

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