The RPE Scale: Train by Feel, Progress by Numbers
The short version: RPE (Rating of Perceived Exertion) rates how hard a set feels on a 1-10 scale. It pairs with reps in reserve (RIR), RPE 8 means about 2 reps left in the tank. Use it to adjust intensity to your daily readiness instead of chasing fixed numbers.
Some days the bar flies up; other days your "easy" weight feels brutal. Fixed percentages of your one-rep max ignore that. The RPE scale fixes it by letting you train to a target effort rather than a target number, so a great day pushes you further and a rough day doesn't break you. Here's how to use it.
What is the RPE scale?
RPE stands for Rating of Perceived Exertion, how hard an effort feels to you. The concept comes from Dr Gunnar Borg, whose original scale ran from 6 to 20. Modern strength training uses a simpler 1-10 scale, popularised by Mike Tuchscherer, where the number reflects how close a set was to failure.
An RPE of 10 is a maximal set, no more reps were possible. An RPE of 8 means the set was hard but you could have done about two more good reps. Below 5, the effort is light enough to be a warm-up.
RPE and reps in reserve (RIR): the conversion chart
The easiest way to apply RPE is through reps in reserve (RIR), how many reps you had left. The relationship is simple: RIR = 10 - RPE.
| RPE | Reps in reserve | What it feels like |
|---|---|---|
| 10 | 0 | Maximal, no more reps possible |
| 9.5 | 0-1 | Maybe a tiny bit more |
| 9 | 1 | One solid rep left |
| 8 | 2 | Strong, controlled, two left |
| 7 | 3 | Challenging but comfortable |
| 5-6 | 4+ | Warm-up or technique work |
← Faites défiler horizontalement pour voir toutes les colonnes →
Most lifters find it easier to ask "how many reps did I have left?" and convert: 2 reps left → RPE 8.
How to autoregulate your training with RPE
Autoregulation means adjusting the load to your readiness on the day instead of forcing a fixed weight. If your program calls for a top set at RPE 8 and 100 kg feels like RPE 9, you drop the weight slightly; if it feels like RPE 7, you add a little. The target effort stays constant while the load flexes with your fatigue, sleep and stress.
For most goals:
- Hypertrophy: working sets at RPE 7-9 (1-3 reps in reserve).
- Strength: top singles and triples at RPE 8-9, leaving a small margin.
- Deload / technique: keep everything at RPE 5-6.
A structured program, like the one in Fit'Distance, lets you log the RPE of each set and see how your real effort tracks against the plan over time.
Common RPE mistakes to avoid
- Sandbagging every set at RPE 10: training to failure constantly multiplies fatigue and slows recovery without extra growth.
- Mis-rating early in a program: RPE accuracy improves with experience. Beginners often underestimate how many reps they truly have left.
- Ignoring the bar speed: if reps slow down sharply, your RPE is climbing fast even if it still "feels" okay.
RPE in brief
The RPE scale rates effort from 1 to 10 and pairs with reps in reserve (RIR = 10 - RPE). Train most working sets at RPE 7-9, reserve RPE 10 for testing, and let the number, not the weight on paper, guide each session so your training matches how your body actually feels that day.
FAQ
What is the RPE scale?
What is the RPE scale?
RPE stands for Rating of Perceived Exertion, how hard an effort feels. In strength training the modern scale runs from 1 to 10, where 10 is a maximal effort with nothing left and 8 means you could have done about two more reps. It lets you set intensity by feel rather than by a fixed percentage of your max.
How does RPE relate to reps in reserve (RIR)?
How does RPE relate to reps in reserve (RIR)?
They are two sides of the same coin: RIR = 10 - RPE. RPE 8 ≈ 2 reps in reserve, RPE 9 ≈ 1 rep left, RPE 10 = 0 reps left (a true maximal set). Many lifters estimate RIR first, then convert to the RPE target on their program.
What RPE should I train at to build muscle?
What RPE should I train at to build muscle?
For hypertrophy, keep most working sets between RPE 7 and 9 (1-3 reps in reserve), hard enough to grow, far enough from failure to protect the next set. Save RPE 9.5-10 for occasional testing.
Is RPE better than training by percentage of 1RM?
Is RPE better than training by percentage of 1RM?
They answer different questions. Percentages plan the load ahead of time; RPE adjusts it to your readiness on the day. Pairing a percentage plan with an RPE cap lets you autoregulate around sleep, stress and fatigue.
