1RM Calculator

Estimate your one-rep max from submaximal work using RIR.

Based on the Evolve Load/RIR Chart (Nuckols et al., 2023)

Weight Lifted

Reps Performed (1-30)

Reps in Reserve (RIR)

RIR = how many more reps you could have done

Data from meta-regression by Nuckols et al., 2023