RPE Calculator & Chart
Convert Rate of Perceived Exertion (RPE) and reps into a percentage of your 1RM — and estimate your max from any rated set. Based on the Reactive Training Systems chart.
How it works
RPE = reps in reserve
RPE 10 = no reps left, RPE 8 = ~2 in reserve, and so on. Fewer reps in reserve = higher %1RM.
Estimated 1RM
estimated 1RM = weight ÷ (%1RM ÷ 100), using the RPE × reps cell from the chart.
Why use RPE
RPE auto-regulates load to how you feel that day — stronger days let you push, tired days back off, without rewriting the whole program.
Frequently Asked Questions
What does RPE mean in lifting?
Rate of Perceived Exertion: a 1–10 scale of how hard a set was. RPE 8 means you had about 2 good reps left in the tank.
How do I convert RPE to percentage?
Look up your RPE and rep count in the chart. For example, 5 reps at RPE 8 is about 81% of your 1RM.
What is RIR?
Reps In Reserve — the inverse of RPE. RIR 2 equals RPE 8. Many lifters cue off RIR because "reps left" is easier to judge than a 10-point scale.
Auto-regulate your training.
Log RPE-rated sets in GainLogger and let your progress charts tell the story. Free on iOS & Android.