RPE to %1RM calculator
Last updated: April 28, 2026
RPE (Rate of Perceived Exertion) is a subjective 1-10 set difficulty scale. RPE 10 = total failure. RPE 8 = 2 reps left in reserve. The other way to program strength, alongside %1RM.
The calculator converts a (reps, RPE) pair into the matching 1RM percentage, using consensus tables (Tuchscherer, Helms).
Corresponding %1RM
%
RIR (reps in reserve)
Reps left before failure.
RPE → %1RM table (common references)
| RPE | 2 reps | 4 reps | 6 reps | 8 reps | 10 reps |
|---|---|---|---|---|---|
| 10 | 96% | 89% | 82% | 74% | 67% |
| 9 | 92% | 85% | 78% | 70% | 64% |
| 8 | 88% | 82% | 74% | 67% | 60% |
| 7 | 85% | 78% | 70% | 64% | 57% |
| 6 | 82% | 74% | 67% | 60% | 54% |
Consensus tables (Tuchscherer, Helms). Calibrate to your own feel after 2-3 weeks of RPE tracking.
RPE and %1RM, two sides of the same coin
%1RM is fixed: 80% of your 1RM, regardless of daily form. RPE is auto-regulated: you target a feel, the load adapts. If you are tired, 80% will feel like RPE 9 instead of planned 7. RPE catches that, %1RM does not.
RIR: the inverse of RPE
RIR (Reps In Reserve) counts reps left before failure. RPE 8 = RIR 2. RPE 10 = RIR 0.
Programming with RPE
- Max strength: 1-3 reps @ RPE 8-9.
- Strength volume: 4-6 reps @ RPE 7-8.
- Hypertrophy: 8-12 reps @ RPE 7-9.
- Deload: stay at RPE 6-7 to recover without losing.
Calibrate your RPE
RPE is subjective: it takes 2 to 3 weeks to lock in. Indicators: bar speed on the last rep, mental effort, ability to add reps at the same speed.
FAQ
Is my RPE reliable on day one?
No. Most athletes underestimate RPE early (think 8, actually 6). Compare RPE to last-rep video for 2-3 weeks to calibrate.
RPE and accumulated fatigue?
On a tired day, your RPE 8 may match a lower %1RM than usual. Normal, and that is the system's strength: you do not force on a bad day.
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