Free tool
One rep max calculator
Enter the heaviest set you've completed and EIDOLON estimates your one rep max (1RM), along with the training weight for every rep range.
Estimated one rep max
263 lbs
Training percentages
| % of 1RM | Weight | Approx. reps |
|---|---|---|
| 100% | 265 lbs | 1 |
| 95% | 250 lbs | 2 |
| 92% | 240 lbs | 3 |
| 89% | 235 lbs | 4 |
| 86% | 225 lbs | 5 |
| 83% | 220 lbs | 6 |
| 81% | 215 lbs | 7 |
| 78% | 205 lbs | 8 |
| 75% | 195 lbs | 9 |
| 73% | 190 lbs | 10 |
| 67% | 175 lbs | 12 |
| 60% | 160 lbs | 15 |
How the 1RM estimate works
EIDOLON uses an Epley-style formula with a logarithmic correction for high-rep sets, so a heavy triple and a 20-rep set both convert to a realistic max. Estimates are most accurate between 1 and 10 reps.
Turn your maxes into a strength map
A single 1RM only tells you about one lift. EIDOLON takes all of your personal records and grades each muscle from Untrained to Mythic against bodyweight- and sex-relative standards, then estimates your body composition from total force production.
Build your strength map