1 rep max calculator
Computes your 1 rep max based on a collection of formulas. Not every forumla is represented here and each varies slightly. These are only estimates and may vary from true performance. The average of all the formulas is listed at the top of the table.
The calculations become less accurate with a greater number of reps and is capped at 15.
| formula | 1 rep max |
|---|---|
| Average | - |
| Brzycki | - |
| Epley | - |
| Lombardi | - |
| Mayhew et al. | - |
| O'Conner et al. | - |
| Wathan | - |
The table below displays your estimated max weight at each rep count based on your 1 rep max. These are just estimates and likely deviate from your "true" max at each rep range.
Your approximate working weights for various set x rep schemes are going to start around 80-85% of your max effort for the specified rep range. For example, if you have a 10 rep max backsquat of 285 lbs, your working weight will start around 220 lbs.
NOTE: This is for traditional lifts and bodybuilding movements, not Olympic Weightlifting.
| reps | % | weight |
|---|---|---|
| 1 | 100% | - |
| 2 | 95% | - |
| 3 | 93% | - |
| 4 | 90% | - |
| 5 | 87% | - |
| 6 | 85% | - |
| 7 | 83% | - |
| 8 | 80% | - |
| 9 | 77% | - |
| 10 | 75% | - |