One-Rep Max

Estimate your one-rep max from a weight and the number of reps you completed with it, using the Epley formula. It's most reliable for sets of about 10 reps or fewer. Informational only — always lift within your ability and use a spotter.

Try it now

Worked example

1RM: 215.833333

Learn the method

Inputs

Weight
185
Reps
5

Frequently asked

What is the Epley formula?

It estimates 1RM as weight × (1 + reps ÷ 30), so more reps at a given weight imply a higher one-rep max.

Is a calculated 1RM safe to attempt?

The number is an estimate, not a guarantee. Progress toward heavy singles gradually and with proper technique.