One Rep Max Calculator

This free one rep max calculator estimates estimated one-rep max (1RM) using the Epley formula, based on weight lifted and reps performed. It's a way to estimate your max lift without actually attempting a single all-out rep.

Fill in the fields above with your own numbers to get an instant, personalized result. This tool is for general informational purposes and is not a substitute for professional medical advice.

Frequently Asked Questions

What formula does this one rep max calculator use?

It uses the Epley formula, based on weight lifted and reps performed to calculate estimated one-rep max (1RM).

Is this medically accurate?

This tool gives a standard estimate based on the Epley formula. Individual results can vary, so treat it as a general guide rather than medical advice.