Reps in Reserve (RIR) & RPE Rate of Perceived Exertion 1RM Calculator
Calculate your estimated One-Rep Max (e1RM), load percentage, and true training intensity using the Reps In Reserve (RIR) and RPE scale (6 to 10) developed by Mike Tuchscherer (Reactive Training Systems) for autoregulated strength progression.
Estimated One-Rep Max (e1RM in kg)
Calculator Inputs
Estimated One-Rep Max (e1RM in kg)
Effective Percentage of 1RM (%)
Reps in Reserve (RIR)
Total Possible Reps
Working Weight Lifted vs Estimated 1RM (kg)
Modern powerlifting and hypertrophy autoregulation tool. Prevents excessive central nervous system burnout while ensuring optimal effective stimulus.
This tool is a mathematical wellness and fitness estimation model for general educational guidance only. The results do not constitute medical diagnosis, clinical advice, or treatment plans. Always consult a qualified physician or certified dietitian before starting any dietary regimen, exercise program, or making health decisions.
Calculation Methodology
RPE = 10 - RIR. Potential Reps to Absolute Failure = Performed Reps + RIR. Estimated 1RM (kg) = Weight Lifted * (1 + 0.0333 * Potential Reps).
Frequently Asked Questions
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