RPE Calculator
RPE (Rate of Perceived Exertion) measures how hard a set feels. Enter your set details to estimate your one-rep max and generate training prescriptions.
What is RPE?
RPE estimates effort and reps-in-reserve. @8 ≈ 2 reps left, @9 ≈ 1 left.
Your Lifts
Saved locally on this device. No account required.
Output Chart
| RPE\Reps | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | — | — | — | — | — | — | — | — | — | — |
| 9.5 | — | — | — | — | — | — | — | — | — | — |
| 9 | — | — | — | — | — | — | — | — | — | — |
| 8.5 | — | — | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — | — |
| 7.5 | — | — | — | — | — | — | — | — | — | — |
| 7 | — | — | — | — | — | — | — | — | — | — |
| 6.5 | — | — | — | — | — | — | — | — | — | — |
Prescriptions (3-10 reps @ RPE 7/8/9)
| Reps | @7 | @8 | @9 |
|---|---|---|---|
| 3 | — | — | — |
| 4 | — | — | — |
| 5 | — | — | — |
| 6 | — | — | — |
| 7 | — | — | — |
| 8 | — | — | — |
| 9 | — | — | — |
| 10 | — | — | — |
Understanding RPE in Strength Training
RPE — Rate of Perceived Exertion — is a way of quantifying how hard a set feels relative to your maximum effort. In strength training, the modern version is anchored to Reps in Reserve (RIR): how many more reps you could have completed before technical failure.
The scale works like this: RPE 10 means you gave everything — zero reps left. RPE 9 means one rep in reserve. RPE 8 means two reps left, and so on. Half-points exist (e.g., RPE 8.5 ≈ 1–2 reps in reserve) for finer precision as your self-awareness develops.
Why coaches prescribe RPE instead of fixed percentages
Fixed percentages assume your performance never varies — but sleep, stress, nutrition, and accumulated fatigue all affect what you can lift on a given day. A percentage-based program might say "squat 80% today," but 80% of a well-rested 1RM and 80% of a fatigued 1RM feel very different. RPE lets you autoregulate: if 80% feels like RPE 7, add weight. If it feels like RPE 9, back off. The effort target stays constant even when the absolute load doesn't.
Reading a prescription
A typical RPE-based prescription reads like "3×5 @RPE 8" — three sets of five reps, each taken to a weight where you have approximately two reps in reserve at the end. The Output Chart on this page shows the actual weights corresponding to those prescriptions, calculated from your current e1RM. The Prescriptions table (below the chart) makes this explicit for 3–10 reps at @7, @8, and @9.
Common beginner mistakes
New lifters almost always underrate their effort — calling a set RPE 7 when it was really RPE 9. This is normal. Accurate RPE rating is a skill that develops over months as you learn what true muscular failure feels like. When in doubt, rate conservatively (higher) to avoid accumulating hidden fatigue across a training week.
Learn more in the What is RPE? and RPE vs. Percentage-Based Training guides. For a step-by-step walkthrough of every feature on this page, see How to Use the RPE Calculator. To learn how RPE fits into a broader training framework, read Autoregulation in Strength Training.