RPE Calculator
Two tools in one: estimate your one rep max from any working set using RPE, then find the exact weight to load for your next set at any reps and RPE.
1) Estimate your 1RM from a set
2) Find your working weight
The RPE chart (% of 1RM)
This is the standard RPE-to-percentage chart the calculator uses. Rows are RPE, columns are reps. A set of 5 at RPE 8, for example, is about 81.1% of your one rep max.
| RPE |
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What is RPE?
RPE — Rate of Perceived Exertion — rates a set by how many reps you had left in reserve. RPE 10 means you could not have done another rep. RPE 9 means one more rep was there. RPE 8 means two more. Half points are common: RPE 9.5 means maybe one more rep, but not a full clean one. Because strength varies day to day — sleep, stress, food, fatigue — the same weight can be RPE 7 on Monday and RPE 9 on Friday. RPE-based training adjusts the load to the lifter in front of the bar today, instead of assuming every day is identical.
The chart works because, for a given RPE, each rep count corresponds to a fairly stable percentage of your max. It is least accurate for very high reps and for beginners, who tend to misjudge how close to failure they really are — one more reason to also sanity-check numbers with the classic one rep max calculator formulas, and to track your level on the strength standards page.
How to rate RPE honestly
Rate the set immediately after finishing, based on the last rep: how it moved and whether another rep would have kept good form. Bar speed is the best tell — if the last rep slowed to a grind, you were at RPE 9.5–10 whether it felt "okay" or not. Filming your top sets makes rating far more accurate. Most working sets in a good program live at RPE 6–9; living at RPE 10 every session is a fast route to stalling and injury.
Frequently asked questions
What does RPE mean in lifting?
RPE means Rate of Perceived Exertion. In strength training it rates how hard a set was on a 1–10 scale based on reps left in reserve: RPE 10 is a maximum effort with nothing left, RPE 9 means one more rep was possible, RPE 8 means two more reps, and so on.
How do I estimate my 1RM with RPE?
Do a set, note the weight, reps and honest RPE, then look up the percentage for that RPE and rep count on the RPE chart. Divide the weight by that percentage. For example, 140 kg for 5 reps at RPE 8 is 81.1% of your max, so your estimated 1RM is about 173 kg.
RPE vs percentages — which is better?
Percentages are simple but ignore daily readiness; a weight that is 85% on a good day can be 92% when you are tired. RPE adjusts the load to the day, which is why most modern powerlifting programs combine both: a percentage range with an RPE cap.
What is RIR and how does it relate to RPE?
RIR means Reps In Reserve — how many more reps you could have done. It maps directly to RPE: RPE 10 = 0 RIR, RPE 9 = 1 RIR, RPE 8 = 2 RIR, RPE 7 = 3 RIR. Many lifters find counting reps in reserve easier than rating RPE.