A practical RPE estimate
This calculator treats RPE as reps in reserve, then uses the adjusted rep count to estimate strength. It is a planning aid, not a substitute for coaching judgment.
Autoregulation
RPE calculator
Enter a set's weight, reps, and effort rating to estimate what that work says about your current strength.
Use the RPE calculator
This page includes an interactive RPE calculator for strength training. Open it in a browser to enter your numbers, switch units where supported, and save the result in Barbell Wiz.
- Use RPE to account for reps in reserve.
- Estimate strength without maxing out.
- Pair RPE notes with routine context in Barbell Wiz.
Use it after top sets
RPE estimates are most useful when the set was hard enough to tell you something but not so sloppy that technique made the number meaningless.
Reference
RPE to percentage chart
This RPE chart uses reps in reserve with the same Epley estimate as the calculator. The percentages are approximate, but they make RPE useful for turning a hard set into a planning number.
Adjusted reps = reps completed + (10 - RPE); e1RM = weight x (1 + adjusted reps / 30)Worked example
315 lb x 5 reps @ RPE 8 = 7 adjusted reps -> 388.5 lb estimated 1RM
RPE chart by reps
Approximate set weight as a percentage of estimated 1RM. RPE 10 means no reps left in reserve.
| Reps | RPE 10 | RPE 9 | RPE 8 |
|---|---|---|---|
| 1 | 96.8% | 93.8% | 90.9% |
| 3 | 90.9% | 88.2% | 85.7% |
| 5 | 85.7% | 83.3% | 81.1% |
| 8 | 78.9% | 76.9% | 75.0% |
| 10 | 75.0% | 73.2% | 71.4% |
Related
Keep building the same training system.
- TrackingRPE tracker
Track RPE, estimated maxes, top sets, backoffs, and strength progress with Barbell Wiz.
- Calculators1RM calculator
Estimate your one-rep max from weight and reps, then use the result for Training Maxes, percentages, and strength planning.
- TrackingWorkout tracker
Track strength workouts, planned sets, RPE, PRs, gear, and progression blocks with Barbell Wiz, a workout tracker built for lifters.
Track RPE where the rest of the session lives.
Download Barbell Wiz and keep estimates, notes, and history connected to the routine.