RPE Calculator
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RPE (Rate of Perceived Exertion) vs RIR (Reps in Reserve)

Both RPE and RIR are auto-regulation tools, but they approach intensity from slightly different angles. RPE focuses on overall exertion, while RIR strictly counts how many more reps you could perform.

RPE (Rate of Perceived Exertion)

Pros

  • Accounts for systemic fatigue
  • Can be used for cardio as well
  • Standardized across powerlifting

Cons

  • Subjective
  • Can be confusing for beginners

RIR (Reps in Reserve)

Pros

  • Highly objective on sets near failure
  • Easy to understand (e.g. 2 reps left)
  • Directly correlates to hypertrophy

Cons

  • Breaks down on very low rep sets (e.g., 1RM attempts)
  • Hard to gauge accurately on exercises like squats

The Verdict

Use RIR for bodybuilding and hypertrophy training (sets of 6-15). Use RPE for powerlifting and top-end strength (sets of 1-5).

Frequently Asked Questions

Use RIR for bodybuilding and hypertrophy training (sets of 6-15). Use RPE for powerlifting and top-end strength (sets of 1-5).