How the scale works
In strength training, RPE is anchored to reps in reserve (RIR) — how many more clean reps you could have done when the set ended. RPE 10 means nothing left; RPE 8 means about two reps were still in the tank.
The table below is the practical mapping most lifters use.
| RPE | Reps in reserve | What it feels like |
|---|---|---|
| 10 | 0 | Could not do one more rep |
| 9.5 | 0–1 | Maybe one more, no guarantee |
| 9 | 1 | One solid rep left |
| 8 | 2 | Two reps left — the classic working zone |
| 7 | 3 | Bar moves fast, effort is honest but comfortable |
| 6 | 4+ | Warm-up / speed work territory |
Why train by RPE instead of fixed percentages
A percentage-based plan assumes your strength is identical every session. It isn’t — sleep, stress, food and accumulated fatigue move it around. A weight that is 75% on paper can feel like 85% on a bad day.
Working to a target RPE (say, 4 sets at RPE 7–8) keeps the stimulus constant even when the load has to change. That is autoregulation: heavier on good days, lighter on rough ones, progress on both.
How to calibrate your RPE
Beginners usually underestimate effort: what feels like RPE 9 is often RPE 7. Two fixes work well. First, occasionally take a set to technical failure in a safe exercise — that recalibrates what “nothing left” means. Second, film your top sets: bar speed slows sharply in the last two reps before failure, so video is honest feedback.
Expect your ratings to become reliable after a few weeks of paying attention. Precision beyond half a point is not the goal — consistency is.
How seto uses RPE
Every exercise page shows a target RPE next to its set and rep protocol, and the app’s progression logic reads your logged effort to decide when to add weight. See it in context in the exercise library.