1RM calculator
Put in a set you've done and see the most you could likely lift for one rep, along with what each of seven well-known formulas says.
Estimated 1RM
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Enter a set's weight and reps.
| Formula | 1RM |
|---|---|
| Epleyw × (1 + r/30) | — |
| Brzyckiw × 36 / (37 − r) | — |
| Lander100w / (101.3 − 2.67123r) | — |
| Lombardiw × r^0.10 | — |
| Mayhew100w / (52.2 + 41.9e^(−0.055r)) | — |
| O'Connerw × (1 + 0.025r) | — |
| Wathan100w / (48.8 + 53.8e^(−0.075r)) | — |