Strength
As of 2026-04-24
How RPE to Percentage Converter works
Methodology for the RPE to Percentage Converter: formulas, coefficients, data sources, assumptions, and known limitations.
Scope
Converts RPE and reps to a percentage of 1RM using the Tuchscherer RPE chart.
Formula
pct_1rm = table(rpe, reps) from Tuchscherer's published RPE chart.
Coefficients
| Parameter | Value | Note |
|---|---|---|
| Chart row count | RPE 6 to 10 in 0.5 steps | |
| Chart column count | Reps 1 to 12 |
Data sources
- Zourdos MC, Klemp A, Dolan C, et al. Novel resistance training-specific rating of perceived exertion scale measuring repetitions in reserve. J Strength Cond Res. 2016;30(1):267-275. — PMID 26049792. Peer-reviewed RIR-based RPE chart covering the same cells as Tuchscherer's original table.
- Helms ER, Cronin J, Storey A, Zourdos MC. Application of the repetitions in reserve-based rating of perceived exertion scale for resistance training. Strength Cond J. 2016;38(4):42-49. — Practical-application companion paper.
- Tuchscherer M. The Reactive Training Manual. Reactive Training Systems, 2008. — Original coaching manual; self-published and not peer-reviewed.
Assumptions
- User can reliably self-report RIR; novices over-estimate reserve by 2–3 reps.
Approximation range
Chart accuracy within ~3% of 1RM for experienced lifters on bench and squat.
Limitations
- RPE drift on high-rep sets is substantial; prefer RPE for 1–6 rep sets.
- RPE for deadlift and accessory lifts is less calibrated than for the competition lifts.
Reproducibility
RPE 8 x 5 reps ≈ 84% of 1RM (from Tuchscherer chart).
Change log
- 2026-04-24: methodology page first published.
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