1RM Calculator
Enter a weight and reps performed to calculate your estimated one-rep max.
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RPE ↔ RIR Chart (4–10)
Estimated single-rep efforts and percentages based on your 1RM.
RPE (Rate of Perceived Exertion) measures how hard a set feels on a scale of 1–10. RIR (Reps in Reserve) represents how many reps you could still perform before failure. For example, RPE 9 ≈ 1 RIR.
| RPE | RIR | % of 1RM | Weight |
|---|
Set Planner
Plan your sets based on desired RPE and rep target.
Results:
| Sets | — |
| Reps | — |
| RPE / RIR | — |
| Weight | — |
| % of 1RM | — |