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RPE/RIR Training Weight Calculator Plan working weight from 1RM, reps and RPE/RIR or estimate your e1RM from a test set.
Calculation note This calculation is for general orientation only. The result is based on your inputs and the stated assumptions, and may contain rounding.
Terms of use Explanation
How RPE/RIR Training Weight Calculator works The model treats repetitions plus RIR as estimated repetitions to technical failure.
e1RM e1RM = Weight × (1 + (reps + RIR) ÷ 30)The inverse formula provides the working weight for a known 1RM.
Practice
Practical examples For illustration only – your own calculation is what counts.
5 reps at RPE 8 A set of five repetitions and two RIR are planned from a 1RM of 120 kg.
Result: The model provides working weight, percentage, RPE and RIR.
Test set with reserve 100 kg is lifted five times with an estimated two repetitions in reserve.
Result: The e1RM is calculated from seven modeled repetitions to failure.
Estimate RIR too optimistically An incorrect reserve shifts the e1RM significantly.
Evaluate only clean reps and compare the estimate over multiple sets.
FAQ
Frequently asked questions What does RIR mean? RIR means Repetitions in Reserve: the estimated number of clean repetitions that would still have been possible.
How are RPE and RIR related? On the 10 scale used here, RPE = 10 − RIR. RPE 8 corresponds to approximately two RIR.
Does the calculator use a fixed RPE percentage table? No. It transparently extends the published Epley formula by adding repetitions and RIR.
RPE/RIR and e1RM remain subjective and modeled values, respectively; the accuracy decreases with very high repetition numbers. Sources
Sources and references Related calculators
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