# Max Lift Calculator

Calculate your one-rep max using various popular formulae. Estimate reps at a % of your 1RM.

% of 1RM | Weight | Reps of 1RM^{*} |
---|---|---|

100% | ||

95% | ||

90% | ||

85% | ||

80% | ||

75% | ||

70% | ||

65% | ||

60% | ||

55% | ||

50% |

^{*}Note: Reps of 1RM is calculated by rearranging each formula to solve for reps with the original 1RM result and the weight at X% of 1RM as inputs. Reps of 1RM may be inaccurate for certain formulae at a lower % of 1RM (most notably: Lombardi and Mayhew). Please keep this in mind when selecting "Average All" as the formula option. Mayhew's reps at 95% of max may also be negative. These are what I discovered as flaws in the formulae due to exponentiality, not a calculation error. The first three formulae - Epley, Brzycki and Lander - are better at predicting reps at a % of 1RM.