Free tool

RPE and RIR calculator

The weight to load for your next set, from a set you have already done.

Short answer: Enter a recent set and your target; the calculator estimates your 1RM with the Epley formula and gives the weight for your target reps and reps in reserve.

Weight of a recent set80 kg

Reps you did5 reps

Reps left in reserve2 RIR (RPE 8)

Target reps8 reps

Target reps in reserve2 RIR (RPE 8)

Target weight: 74 kg
Of estimated 1RM: 75%
Estimated 1RM: 98.7 kg

Uses the same Epley estimate as the 1RM calculator, counting reps in reserve as reps you could still do. RPE is 10 minus reps in reserve. Round to the nearest weight you can load. Nothing you enter is saved or sent anywhere.

Educational information for adults aged 18 and over. It does not diagnose, treat or manage any medical condition. If you have a health condition, or symptoms that worry you, speak to your doctor or a health professional.