The Epley formula, and how far to trust it
How the Epley formula turns a set of several reps into a one-rep max, where it comes from, how accurate it is by rep range, and how to use it to pick working weights.
Updated 27 October 2026 · 3 min read
Estimating maxes guides
Working out a one-rep max from a set of several reps, and how far to trust the number.