What Is RPE in Strength Training? A Practical RPE and RIR Guide
In strength training, RPE rates how close a set was to the limit. The version commonly used by lifters is tied to repetitions in reserve, or RIR.
| RPE | Approximate reps left | What it means |
|---|---|---|
| 10 | 0 | No additional good rep available |
| 9 | 1 | About one good rep left |
| 8 | 2 | About two good reps left |
| 7 | 3 | About three good reps left |
| 6 or lower | 4 or more | Light effort or warm-up territory |
Half points are useful when a set sits between two descriptions. They are still estimates, not laboratory measurements.
Use RPE after the set
Suppose the plan calls for 100 kg × 5 at RPE 8. You complete five stable reps and believe two more were available. Record RPE 8 and keep the planned progression. If one more rep was available, record RPE 9. If bar path or technique deteriorated, the technical limit matters even if the muscles could have forced another rep.
The MaxRep RPE 1RM calculator adds the estimated remaining reps to the completed reps before comparing 1RM formulas. This is more honest than treating every submaximal set as a true rep maximum.
RPE improves with practice
RPE can be useful for load prescription, but lifters do not estimate remaining reps perfectly. Accuracy tends to improve closer to failure and with lower rep counts. A recent systematic review also found that RPE scales can complement movement velocity and relative load rather than replace them. See the review of RPE, velocity, and resistance-training intensity.
Keep the rating method consistent. Record RPE immediately after the set, use the same exercise standard, and review several sessions before changing a program.
Compare feeling with movement
RPE answers, “How many reps did I think were left?” Velocity answers, “How fast did the rep move?” Those signals can agree or diverge. A set may feel hard because of poor sleep while the bar still moves normally, or it may feel ordinary while velocity drops more than usual.
Power VBT analyzes lifting video and records mean concentric velocity and bar path for each rep. Pair that record with RPE to learn how your ratings relate to actual movement. Download it for iPhone or Android.