One-rep max calculator
Estimate your 1RM from a set you actually did. Four different estimators — Epley, Brzycki, Lombardi and Mayhew — plus their mean. The unit is whatever you enter (kg or lb).
| Formula | Estimated 1RM |
|---|---|
| Epley | 116.7 kg |
| Brzycki | 112.5 kg |
| Lombardi | 117.5 kg |
| Mayhew et al. | 119.0 kg |
| Average | 116.4 kg |
Formulas: Epley w·(1 + r/30); Brzycki w·36/(37 − r); Lombardi w·r^0.10; Mayhew w / (0.522 + 0.419·e^(−0.055·r)).
Source: One-repetition maximum — Wikipedia, with original citations to Epley (1985), Brzycki (1993), Lombardi (1989) and Mayhew et al. (1992).