RPE to %1RM calculator
Free RPE calculator and chart. Convert between RPE, reps in reserve, and percent of 1RM using the Reactive Training Systems table for autoregulated training.
RPE, or Rating of Perceived Exertion, is a 1-to-10 scale that describes how hard a set felt. An RPE 8 set means "two reps in reserve": you could have done two more with good form. RPE 10 means "no reps in reserve": you could not have done another. A percentage program prescribes the same weight on a good day and a bad one; rating each set records which day you had.
The chart on this page maps RPE and rep count to a percentage of your one-rep max. It comes from Mike Tuchscherer's Reactive Training Systems table, which is widely used in powerlifting. Enter your 1RM, target RPE and rep count to get the working weight that should land you there. MuscleBuddy does not read this chart when it moves your load: logging a set above or below its target RPE moves the next session's load by a fixed percentage per RPE point, about 3.5% of the load. Use the chart to pick a working weight from a known 1RM.
Full RPE-to-%1RM chart
| RPE | 1r | 2r | 3r | 4r | 5r | 6r | 7r | 8r | 9r | 10r |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 100.0 | 95.5 | 92.2 | 89.2 | 86.3 | 83.7 | 81.1 | 78.6 | 76.2 | 73.9 |
| 9.5 | 97.8 | 93.9 | 90.7 | 87.8 | 85.0 | 82.4 | 79.9 | 77.4 | 75.1 | 72.3 |
| 9 | 95.5 | 92.2 | 89.2 | 86.3 | 83.7 | 81.1 | 78.6 | 76.2 | 73.9 | 70.7 |
| 8.5 | 93.9 | 90.7 | 87.8 | 85.0 | 82.4 | 79.9 | 77.4 | 75.1 | 72.3 | 69.4 |
| 8 | 92.2 | 89.2 | 86.3 | 83.7 | 81.1 | 78.6 | 76.2 | 73.9 | 70.7 | 68.0 |
| 7.5 | 90.7 | 87.8 | 85.0 | 82.4 | 79.9 | 77.4 | 75.1 | 72.3 | 69.4 | 66.7 |
| 7 | 89.2 | 86.3 | 83.7 | 81.1 | 78.6 | 76.2 | 73.9 | 70.7 | 68.0 | 65.3 |
How this works
Heavier weights move slower and feel harder, so at a fixed rep count, how hard a set felt reflects how close the load was to your max. Mike Tuchscherer of Reactive Training Systems turned that into a table.
Each row is a target RPE and each column a rep count. The cell is the percentage of your 1RM that should produce that combination: RPE 8 for 5 reps is 81% of 1RM. With a 100 kg bench 1RM, a set of 5 at RPE 8 should be around 81 kg.
Why RPE works: it accounts for daily readiness. Sleep, stress, food and accumulated fatigue all change how heavy a given weight feels. A percentage program has you lift the same weight either way, so some days it's too easy and some days too hard. An RPE target lets you push on good days and back off on bad ones while keeping the effort of the set about the same.
How to use the chart in practice: if your program prescribes "5 × 5 at RPE 8," look up the percentage (81%), multiply by your current estimated 1RM, and round to the nearest plate-friendly weight. After the set, rate the RPE you hit. If it was 8, keep the weight. If it was 9, take off a few percent next session; if it was 7, add a few. MuscleBuddy uses about 3.5% per RPE point.
Limits of the chart: it was built for trained lifters doing 1–10 reps on compound lifts. It holds up worse on high-rep accessory work, where muscular endurance varies a lot between people. Newer lifters also judge reps in reserve less accurately, so if you're new, treat the number as a starting point, start a little under it, and adjust from how the sets go over a few weeks.
Frequently asked questions
- What is RPE?
- Rating of Perceived Exertion: a 1-to-10 scale describing how hard a set felt. RPE 10 means no reps in reserve; RPE 8 means two reps left in the tank. Rating sets lets you set today’s load by how today feels.
- What is RIR and how does it relate to RPE?
- Reps in reserve counts down as RPE counts up: RIR = 10 − RPE. RPE 10 is 0 RIR, RPE 9 is 1 RIR, RPE 8 is 2 RIR. Many coaches prefer RIR because the question is more concrete: "how many more reps could you have done?"
- How accurate is the RPE-to-%1RM chart?
- It is a practitioner’s chart built from coaching data, and trained lifters program the squat, bench and deadlift from it. It is less reliable for newer lifters, who judge reps in reserve less accurately, and for high-rep accessory work.
- Should I program in RPE or in percentages?
- RPE adapts to the day, which helps when sleep, stress or fatigue swing. Percentages are easier to plan and to follow. Many programs combine them: a prescribed percentage, capped by an RPE target.
- What RPE should I train at?
- Common ranges: RPE 7–9 for hypertrophy work, RPE 8–9 for strength work, RPE 9–10 for heavy singles when peaking. Sets to RPE 10 cost the most recovery, so most programs use them sparingly.
- Why does the same RPE feel different on different days?
- Readiness moves with sleep, food, stress and accumulated fatigue. RPE-based training lets you adjust the load to that instead of forcing a fixed weight.
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