training · programming

What is RPE (rate of perceived exertion)?

RPE is the effort dial behind most modern strength programs: a simple number for how hard a set really was. This glossary entry explains what rate of perceived exertion means, the full 1 to 10 scale, how it maps to reps in reserve, where the idea came from, and how coaches use it with clients they cannot see in the room.

By Markus Evers · Updated August 2026

the short answer

RPE stands for Rating of Perceived Exertion - a 1 to 10 scale of how hard a set felt. In strength training it maps directly to reps in reserve: RPE 10 is a maximal effort with nothing left, RPE 9 leaves one rep in the tank, RPE 8 leaves two, and so on down the scale. Rating effort this way lets a lifter and coach prescribe how hard to push by feel, adjusting the load to the day rather than chasing a fixed number when the body is under-recovered.

This article is general training education, not medical advice. If you are new to lifting or returning from injury, work within your ability and consult a qualified professional before training close to your limit.

the scale

The RPE scale, from 10 down to 6.

The strength RPE scale is anchored at the top: RPE 10 is a genuine maximal effort. Every point below it adds about one more rep you could have done, which is why RPE and reps in reserve line up so cleanly. Here is what each value means and how the set should feel.

RPE	Reps in reserve	What the set feels like
RPE 10	0 RIR	Maximal effort. You could not add another rep with good form - bar speed stalls and technique starts to break.
RPE 9.5	0-1 RIR	Maybe one more, maybe not. A true near-limit grind where the outcome is uncertain.
RPE 9	1 RIR	One clean rep left in the tank. Very hard but still controlled to the end.
RPE 8.5	1-2 RIR	One to two reps left. Clearly heavy, reps still crisp.
RPE 8	2 RIR	Two reps left. The dependable hypertrophy working effort.
RPE 7.5	2-3 RIR	Two to three reps left. A solid effort with a little margin.
RPE 7	3 RIR	Three reps left. A moderate, repeatable working set.
RPE 6	4 RIR	Four reps left. Warm-up, technique, or speed-work territory.

Notice how the top of the scale is where the action is. The jump from RPE 6 to RPE 8 feels far bigger than the jump from RPE 8 to RPE 10, because effort ramps steeply near failure. That is why most productive training lives between RPE 7 and 9 - close enough to drive the adaptation, far enough to keep fatigue in check. Once you know the RPE you want to train at, a free RPE calculator turns that effort and a rep count into a percentage of your one-rep max and the exact weight to load.

two sides of one coin

RPE vs RIR.

RPE and RIR describe the same thing - how close a set is to failure - from opposite directions. RPE rates the effort on a 1 to 10 scale; RIR (reps in reserve) counts the reps you have left. They convert with one bit of arithmetic: subtract the RIR from 10 to get the RPE, or subtract the RPE from 10 to get the RIR.

RPE 10= 0 RIR (true failure, nothing left)
RPE 9= 1 RIR (one rep left)
RPE 8= 2 RIR (two reps left - the hypertrophy default)
RPE 7= 3 RIR (three reps left)

Because they are interchangeable, the choice is mostly about which one a lifter answers more honestly. Many find RIR easier because it asks a countable question rather than rating a feeling, while others prefer RPE as a single effort number. For a deeper look at reps in reserve on its own, see what RIR means, and for when to reach for each in a written program, read RPE vs RIR for programming.

a short history

Where the RPE scale came from.

The original scale was not built for lifting at all. Swedish psychologist Gunnar Borg developed the Borg Rating of Perceived Exertion scale in the 1960s to measure cardiovascular effort, and it ran from 6 to 20 - an odd range chosen so that multiplying a value by ten gave a rough estimate of heart rate during steady exercise. That 6 to 20 scale is still used in endurance and clinical settings today. Strength training later adapted the concept into the tighter 1 to 10 version now common in the gym, popularized for lifting by coach Mike Tuchscherer, who tied each number to reps in reserve so a rating could translate straight into how close a set was to failure. Same core idea of rating your own effort, reworked for the barbell.

for online coaches

How coaches apply RPE with remote clients.

RPE earns its keep in online coaching, where you cannot watch the bar move. Instead of prescribing a flat weight that ignores a client sleeping badly or peaking on a strong day, you prescribe an effort - "top set of 5 at RPE 8" - and let the client find the load that hits it. That single number carries the intent of a coach standing beside the rack, across any distance.

Write the effort as a cue

In Coachway's workout builder, there is no dedicated RPE field, so add the target in the exercise notes - for example "stop at RPE 8" - where it sits next to the sets, reps, and video demo the client sees.

Calibrate the number

New clients almost always stop short of the true effort they report. Have them take an occasional safe set close to failure so their sense of RPE 9 or 10 is anchored to something real, then trust their ratings more over time.

Read it back and adjust

Compare the RPE a client logs against the target. Too easy means add load next time; hitting failure early means pull it back. That loop is how progressive overload happens block to block.

The math is easy to run once and reuse. Try the RPE calculator to turn a target effort into a working weight, or the RIR calculator if your clients think in reps left instead. For the full workflow of introducing the scale and reading it back from check-ins, our guide on how to use RPE with online clients walks through it end to end.

questions lifters ask

Frequently asked questions.

What does RPE stand for?

RPE stands for Rating of Perceived Exertion - a 1 to 10 scale of how hard a set felt. In strength training, RPE 10 is a maximal effort with 0 reps left, and each point down means roughly one more rep in reserve. It lets you gauge and prescribe effort by feel instead of forcing a fixed percentage every session.

What is the RPE scale in weightlifting?

The lifting RPE scale runs 1 to 10 and maps directly to reps in reserve: RPE 10 equals 0 reps left, RPE 9 equals 1, RPE 8 equals 2, RPE 7 equals 3. Most hypertrophy work sits around RPE 7 to 9, while heavy strength top sets often stay near RPE 7 to 8 to keep technique sharp. Half points such as RPE 8.5 let you fine-tune the effort.

Is the RPE scale the same as the Borg scale?

Not quite. The original Borg scale, created by Gunnar Borg in the 1960s, ran from 6 to 20 to estimate cardiovascular effort and loosely track heart rate. Modern strength training uses an adapted 1 to 10 RPE scale, popularized for lifting by Mike Tuchscherer, that ties each number to reps in reserve. Same idea of rating effort, different range and purpose.

This article is general training education, not medical advice. Training near failure carries real injury risk - if you are new to lifting, returning from injury, or managing a health condition, work within your ability and consult a qualified professional before pushing to high effort.

Keep going: put the scale to work with the RPE calculator or the RIR calculator, estimate your max with the one-rep max calculator, and control your rep speed with the tempo calculator. To go deeper on the ideas around effort, read RPE vs RIR for programming, our explainer on training to failure, and the guide to progressive overload.

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