RPE Calculator
Convert RPE (Rate of Perceived Exertion) and rep count to an estimated 1RM. Based on the Tuchscherer RPE chart.
Training Weights from This 1RM
| Reps | RPE 8 | RPE 9 | RPE 10 |
|---|
Full RPE Percentage Chart
| Reps | RPE 6 | RPE 6.5 | RPE 7 | RPE 7.5 | RPE 8 | RPE 8.5 | RPE 9 | RPE 9.5 | RPE 10 |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 86% | 88% | 89% | 91% | 92% | 94% | 96% | 98% | 100% |
| 2 | 83% | 85% | 86% | 88% | 89% | 91% | 92% | 94% | 96% |
| 3 | 81% | 82% | 83% | 85% | 86% | 88% | 89% | 91% | 92% |
| 4 | 78% | 79% | 81% | 82% | 83% | 85% | 86% | 88% | 89% |
| 5 | 75% | 76% | 78% | 79% | 80% | 82% | 83% | 85% | 86% |
| 6 | 72% | 73% | 75% | 76% | 77% | 79% | 80% | 82% | 83% |
| 7 | 69% | 70% | 72% | 73% | 74% | 76% | 77% | 79% | 80% |
| 8 | 66% | 67% | 69% | 70% | 71% | 73% | 74% | 76% | 77% |
| 9 | 63% | 64% | 66% | 67% | 68% | 70% | 71% | 73% | 74% |
| 10 | 60% | 61% | 63% | 64% | 65% | 67% | 68% | 70% | 71% |
RPE-Based Training Explained
RPE-based programming, popularised by Mike Tuchscherer and later adopted widely in powerlifting coaching, solves a fundamental problem with fixed-percentage programs: your strength varies day to day. On a good day, 80% of 1RM might feel like RPE 7. On a poor recovery day, the same weight might be RPE 9. Fixed percentages ignore this variation; RPE-based training adapts to it.
The chart above was derived by Tuchscherer from thousands of logged training sessions, mapping subjective RPE ratings against objective performance data. Each cell shows the percentage of true 1RM that a given rep count at a given RPE corresponds to. Enter a weight, reps, and your RPE from a recent set, and this calculator estimates your 1RM and shows what weights you should hit for other rep and RPE targets.
Frequently Asked Questions
What is RPE in weightlifting?
RPE stands for Rate of Perceived Exertion. In powerlifting, RPE is measured on a 1-10 scale where RPE 10 means you could not do another rep (true max effort), RPE 9 means you had 1 rep left in the tank, RPE 8 means 2 reps left, and so on. It allows coaches to prescribe training intensity in a flexible, auto-regulated way.
What is RIR and how does it relate to RPE?
RIR (Reps In Reserve) is the inverse of RPE proximity to failure. RPE 10 = 0 RIR, RPE 9 = 1 RIR, RPE 8 = 2 RIR, RPE 7 = 3 RIR. Both systems describe how close a set was to failure - RIR is often more intuitive for beginners.
How accurate is RPE-based training?
RPE accuracy improves with experience. Novice lifters tend to underestimate RPE (thinking they are at 8 when closer to 6). After 6-12 months of deliberate RPE tracking, most lifters can judge their RIR within 1 rep. The percentage estimates from this calculator are most reliable for experienced lifters.
What percentage of 1RM is RPE 8 at 5 reps?
According to the Tuchscherer RPE chart, 5 reps at RPE 8 corresponds to approximately 80% of your 1RM. This means you moved a weight you could lift for 7 reps maximum, but stopped at 5. The calculator shows this conversion for all rep and RPE combinations.
Can I use RPE to find my 1RM without maxing out?
Yes - this is one of the main uses of RPE. Perform a heavy single at RPE 9 (1 rep left in reserve) and the calculator will estimate your true 1RM as approximately 105% of that weight. This is safer than a true max attempt and gives reliable enough data for programming.