RPE Calculator

Rate of perceived exertion. In lifting it runs from 6 to 10 and describes how close a set came to failure. RPE 10 is a maximal set. Each half point below 10 adds roughly half a rep you could have completed with good form.

Ask yourself one thing as you rack the bar: how many clean reps were left? With practice your answer gets accurate within about one rep. Filming your sets helps early on, because bar speed on the last rep gives the answer away.

RIR means reps in reserve, the literal count of reps left in the tank. It is RPE flipped around: 2 RIR and RPE 8 describe the same set. Many lifters find counting reps up easier than rating effort down, so this calculator shows both for every target.

The RPE chart links effort and reps to a percentage of your max. Multiply your estimated max by that percentage and you get the weight that should land you at the target effort on a typical day. If you have no max estimate yet, our 1RM calculator will get you one from any recent hard set.

Yes, with one adjustment. Newer lifters misjudge their reps in reserve by a rep or two, so an intended RPE 8 might come out closer to a 7. That error shrinks fast with practice. Keep targets at RPE 8 or below for your first couple of months and the worst outcome is a slightly easy set.

Save maximal sets for rare tests. Most productive training lives between RPE 6.5 and 9, where the effort stays high enough to drive progress and low enough to repeat across a full week. Living at RPE 10 burns recovery that the rest of your program needs.