RPE to Percentage of 1RM
RPE 8 means you had two more in you. Add the reps left to the reps done for the maximum possible at that weight, then drop about 3% off your one-rep max per rep.
Your numbers
Share of 1RM
82%
Weight lifted (kg)
98.4kg
Count
2
Formula
Share of 1RM = 100 − (Reps + (10 − RPE (1–10))) × 3
The 3%-per-rep rule is an approximation. It holds well up to five reps and drifts beyond ten.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| RPE (1–10)How hard it felt, self-rated; 10 means nothing left. | 8 | 4 ~ 10 |
| RepsHow many times you lifted it. | 5 | 1 ~ 15 |
| 1RM (kg)The most you could lift exactly once — an estimate. | 120 | 1 and up |
Step by step
Quick reference table
Results when only RPE (1–10) changes and everything else stays put.
| RPE (1–10) | Share of 1RM (%) | Weight lifted (kg) (kg) | Count |
|---|---|---|---|
| 4 | 70 | 84 | 6 |
| 6 | 76 | 91.2 | 4 |
| 8 | 82 | 98.4 | 2 |
| 10 | 88 | 105.6 | 0 |
What each result means
| Result | At default values |
|---|---|
| Share of 1RM (%)What share of your one-rep max that weight is. | 82 |
| Weight lifted (kg) (kg)The weight you actually lifted. | 98.4 |
| CountA plain count of items; it often ends up as the denominator. | 2 |
Common mistakes
The 3%-per-rep rule is an approximation. It holds well up to five reps and drifts beyond ten.
Glossary
- RPE (1–10)
- How hard it felt, self-rated; 10 means nothing left.
- Reps
- How many times you lifted it.
- 1RM
- The most you could lift exactly once — an estimate.
- Share of 1RM
- What share of your one-rep max that weight is.
- Weight lifted (kg)
- The weight you actually lifted.
- Count
- A plain count of items; it often ends up as the denominator.
Frequently asked questions
Q. How is RPE to Percentage of 1RM calculated?
Share of 1RM = 100 − (Reps + (10 − RPE (1–10))) × 3 — RPE 8 means you had two more in you. Add the reps left to the reps done for the maximum possible at that weight, then drop about 3% off your one-rep max per rep.
Q. Can you walk through an example?
With RPE (1–10) 8, Reps 5, 1RM 120kg, the answer is Share of 1RM 82%.
Q. What do I need to enter?
Enter RPE (1–10), Reps, 1RM. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only RPE (1–10) moves the answer to RPE (1–10) 4 → Share of 1RM (%) 70 and RPE (1–10) 10 → Share of 1RM (%) 88. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The 3%-per-rep rule is an approximation. It holds well up to five reps and drifts beyond ten.
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These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.