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RPE to Percentage Calculator

Turn RPE and reps into a %1RM estimate for smarter load selection.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Rate of Perceived Exertion (RPE), in its strength-training form (the Borg-derived 1-10 scale popularized by Mike Tuchscherer’s RTS system), rates how hard a set felt relative to failure, and each RPE-and-rep-count combination maps to an established percentage of your one-rep max through published RPE charts built from thousands of tracked training sets. An RPE of 8 at 5 reps, for example, corresponds to a materially different %1RM than an RPE of 8 at 12 reps.

Powerlifters and strength athletes use RPE-to-percentage conversion to program training loads without needing a current 1RM test — since RPE is self-reported effort, it naturally adjusts for daily fluctuations in strength from sleep, stress and fatigue in a way a fixed percentage-of-1RM program cannot, while the conversion table still lets a coach translate a felt effort into a concrete load recommendation for programming and load selection.

This calculator takes an RPE rating and rep count and returns the corresponding percentage of your one-rep max.

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