Work out rate of perceived exertion instantly with clear inputs, formula shown and shareable results.
In resistance training the RPE scale maps directly onto reps in reserve: RPE 10 means nothing left, RPE 8 means two more were possible. Adding those reserve reps to the reps performed gives the set's equivalent maximum, which the Epley relation converts to a percentage of one-rep max. Five reps at RPE 8 with 100 kg implies a 1RM near 123 kg.
Reps in reserve
RIR = 10 - RPE
Load as a share of 1RM
%1RM = 1 / (1 + (reps + RIR) / 30)
This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
Often yes, because it adapts to how you feel that day. Fixed percentages ignore sleep, stress and accumulated fatigue.
Poor at first - beginners typically underestimate how many reps they had left. Accuracy improves markedly after a few months of practice.