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