RPE Calculator
An RPE calculator turns a set you have already done into an estimated one rep max. Enter the weight, the reps and how hard the set felt on the RPE scale (where 10 is a maximal effort and 8 leaves about 2 reps in the tank), and you get your projected max.
RPE based loading lets you autoregulate: instead of chasing a fixed weight, you train to a target effort and let the load adjust to how you feel that day.
Calculate Your 1RM
RPE to percentage chart
The RPE scale maps onto a percentage of your one rep max. This chart shows the percentage for a single rep at each RPE; the calculator extends it across rep ranges.
| RPE (1 rep) | % of 1RM |
|---|---|
| RPE 10 | 100% |
| RPE 9.5 | 98% |
| RPE 9 | 96% |
| RPE 8 | 92% |
| RPE 7 | 89% |
Percentages are for a single rep. As reps increase at the same RPE, the percentage of your 1RM drops, which is why the calculator uses the full RPE and rep chart rather than this single-rep snapshot.
FAQ
- What is RPE in lifting?
- RPE stands for Rating of Perceived Exertion, a 1 to 10 scale for how hard a set feels. An RPE of 10 is a maximal effort with nothing left, while an RPE of 8 means you could have done about two more reps.
- How does the RPE calculator estimate my 1RM?
- It takes your weight, reps and RPE, looks up the matching percentage of your one rep max on the RPE chart, and works back to your estimated 1RM. It is a quick way to gauge your max without a true maximal attempt.
- What is RIR and how does it relate to RPE?
- RIR means reps in reserve, the number of reps you had left. It is the mirror of RPE: RIR = 10 minus RPE. So RPE 8 is about 2 reps in reserve, and RPE 10 is 0 reps in reserve.
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