# RPE to % 1RM

> 2016

- Equation: `RPE 10 = 0 RIR; % 1RM from Helms Table 2 (estimated cells besides measured anchors)`
- Variables:
  - `RPE`: Rate of perceived exertion. This chart uses integers 6–10.
  - `RIR`: Repetitions in reserve. RPE 10 is 0 RIR.
  - `% 1RM`: Estimated percent of a one-repetition maximum.
- Authors: Helms, E. R.; Cronin, J.; Storey, A.; Zourdos, M. C.
- Source: Strength and Conditioning Journal, 38(4), 42–49
- DOI: [10.1519/SSC.0000000000000218](https://doi.org/10.1519/SSC.0000000000000218)

Conversion chart from Helms et al. 2016, based on mean RIR-RPE scores in Zourdos et al. 2016 (DOI 10.1519/JSC.0000000000001049). The paper treats 1×100% as measured and most other cells as estimations. Squat-specific in the source; not an absolute conversion.