Estimate one-repetition maximum and percentage-based training loads. Enter the load and completed repetitions to estimate your one-repetition maximum.
Complete the form and select “Calculate result.” Your measurements never leave this page.
A transparent overview of the inputs, method, and appropriate interpretation.
It converts a submaximal lifting set into an estimated one-repetition maximum, then provides percentage-based working loads for training decisions.
Epley one-repetition-max equationClear answers to help you understand and use your estimate.
Yes. It is free, runs in your browser, requires no account, and does not store the measurements you enter.
No. This result is an educational estimate, not a diagnosis or treatment recommendation. A qualified professional can interpret it within your complete health and training context.
Technique, fatigue, rep speed, exercise variation, equipment, motivation, and individual endurance can all change the relationship between reps and maximum strength.
Recalculate after a new comparable working set or a clear performance change. Use the same lift variation, setup, and repetition standard.
Read our calculation methodology →Still have questions? Explore the guides ↗