RPE in Powerlifting: What It Means and How to Use It
· 6 min read · Iron Raven
RPE is a way of measuring how hard a set was by how many more reps you could have done. Used well, it lets your training follow how strong you are today, not how strong a spreadsheet assumed you would be.
What RPE means
RPE stands for rate of perceived exertion. In powerlifting it's rated on a 1–10 scale based on reps in reserve (RIR): how many more reps you could have done with good form. The version most lifters use was popularised by powerlifting coach Mike Tuchscherer, and researchers later tested a reps-in-reserve RPE scale for lifting (Zourdos and colleagues, 2016).
RPE
What it means
10
Maximal. No more reps, and no more weight.
9.5
No more reps, but you could have added a little weight.
9
One rep left.
8.5
Definitely one left, maybe two.
8
Two reps left.
7
Three reps left. Fast, confident reps.
6 and below
Warm-up and technique work.
The RPE chart in the Iron Raven app, prefilled from your maxes.
Why powerlifters use it
Percentages assume you are the same lifter every day. You aren't: sleep, stress, diet and the last session all change what you can lift. RPE lets the weight follow your day. "3 × 3 at RPE 8" asks for the same effort whether you're flying or flat, while "3 × 3 at 85%" might be too easy one week and a grind the next.
An RPE chart turns a target like "5 reps at RPE 8" into a percentage of your 1RM. Five reps with two in the tank is about the same effort as seven reps to failure, which works out to roughly 81% of your max. With a 180 kg squat, that's about 145 kg.
Use the chart to pick a starting weight, then let the RPE decide:
Start your top set at the chart's weight.
Rate the set honestly.
If it was easier than the target, add a little weight next set; if harder, take a little off.
Our RPE chart does this for any max and rounds to weights you can load.
Getting better at rating sets
Most lifters underestimate how many reps they have left, especially on higher-rep sets and in the first few months of using RPE. A few habits help:
Rate straight after the set, before you look at the numbers or talk to anyone.
Use bar speed as a check. If the last rep slowed down a lot, you were probably at RPE 9 or above.
Every so often, test it. On a safe lift with spotters or safeties, take a set you'd rate RPE 8 to failure occasionally and see how close you were.
Be most careful above 6 reps. Ratings are least accurate on long sets.
Common mistakes
Treating RPE as a target to beat. An RPE 8 set that turns into an RPE 9.5 grinder is a miss, not a win.
Using RPE to dodge hard work. It works in both directions: on a good day, the weight goes up.
Rating effort instead of reps left. A set can feel horrible and still have two reps left. RPE is about the reps, not the discomfort.
RPE in Iron Raven
Iron Raven logs RPE on your sets and uses it, with your weights and reps, when it writes your next week. The app's RPE chart prefills from your squat, bench and deadlift, and the 1RM calculator accepts an RPE so an RPE 8 set gives you a sensible estimate of your max.
