RPE Calculator
Convert an RPE and rep target into a working weight, or check the RPE of a set you just did.
Estimated load
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Take the quizHow RPE-based loading works
RPE (Rate of Perceived Exertion) describes how many reps you had left in the tank at the end of a set. An RPE of 10 means you couldn't have done another rep; an RPE of 8 means you had about 2 more reps in reserve.
This calculator uses a standard RPE-to-percentage chart, popularized by powerlifting coach Mike Tuchscherer, that maps a given rep count and RPE to a percentage of true 1RM. Enter your training max, target reps, and target RPE to get a working weight, or run the numbers backward after a set to estimate how heavy it really was.
RPE-based programming is more forgiving than fixed-percentage programming on days when you're feeling strong or run down, since the target adjusts to how the weight actually feels rather than a number fixed weeks in advance.
Where these numbers come from
The formulas and default values in this calculator are based on:
- Tuchscherer, M., "The Reactive Training Manual" RPE percentage chart (reps-in-reserve model)
These are planning estimates for training purposes. Check with a coach, trainer, or physician before starting a new program or maxing out.
Frequently asked questions
What's the difference between RPE and RIR?
RIR (reps in reserve) counts reps left directly; RPE is a 1–10 scale where RPE 10 = 0 RIR, RPE 9 = 1 RIR, and so on. They describe the same thing from opposite directions.
Is RPE accurate for beginners?
Newer lifters tend to underestimate how many reps they have left, since they haven't yet learned what true failure feels like. RPE gets more reliable with training experience.
Can I use this for any lift?
Yes — the RPE chart is lift-agnostic. Enter the training max for whichever lift you're programming.
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