RPE to Percentage of 1RM Calculator

Map RPE 6-10 across 1-12 reps to % of 1RM (Tuchscherer / Reactive Training Systems table).

Inputs

Leave 0 to skip weight calculation.

Result

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General calculation reads

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How to use this calculator

  • Pick the RPE you hit on the set.
  • Enter reps performed.
  • Optionally enter known 1RM to compute the corresponding weight.
  • Use to calibrate intensity day-to-day.

About this calculator

RPE (Rate of Perceived Exertion) on the Mike Tuchscherer 6-10 scale: 10 = absolute max, 9 = 1 rep in reserve (RIR), 8 = 2 RIR, 7 = 3 RIR. Combined with rep count, it maps to a % of 1RM. The RTS table (Reactive Training Systems) is the standard reference: a set of 5 at RPE 8 = ~81%; a set of 3 at RPE 9 = ~89%. Once you understand the table, RPE-based programming lets you adjust weight day-to-day without rigidly chasing prescribed percentages.

Frequently asked

How accurate is RPE?+
For experienced lifters: ±0.5 RPE = ±2-3% of 1RM. Beginners under-rate effort consistently — most novice "RPE 7s" are actually RPE 9.
When to use RPE vs. fixed %?+
RPE is better for intermediate+ lifters. Beginners progress so fast that fixed % becomes inaccurate quickly anyway.
What is RIR?+
Reps in Reserve. RIR 0 = max effort, RIR 1 = could have done one more, RIR 2 = could have done two more. RIR 0 = RPE 10.
What about RPE 1-5?+
They're technically defined (1 = effortless) but rarely used — most training prescriptions live in 6-10.
Why not just use 1RM%?+
Your true 1RM varies day-to-day with sleep, stress, food. RPE is what you actually feel. Both have a place.

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