Enter the weight and reps you completed. The calculator gives an approximate one-rep max that can be used to compare workouts and track progress.
The adjustment uses a reps-to-%1RM table: the strength profile estimates higher and the endurance profile lower. It is capped at ±5% and does not alter a single rep.
| Reps | Weight | % of 1RM |
|---|---|---|
| 1 | — | — |
| 2 | — | — |
| 3 | — | — |
| 4 | — | — |
| 5 | — | — |
| 6 | — | — |
| 7 | — | — |
| 8 | — | — |
| 9 | — | — |
| 10 | — | — |
Weights are calculated backwards from the selected formula and profile. They are estimates, not guaranteed results.
This is an estimate, not a command to test a max single. Technique, fatigue and exercise choice still matter.
Estimated 1RM helps compare sets with different weights and reps. For example, 80×8 and 90×5 can be put on one scale.
It is useful when you want to understand whether the training load is really moving forward instead of only looking at the weight on the bar.
The calculator gives you a quick estimate. In GYM Planner, estimated 1RM becomes part of your training log and helps you see progress over time:
