Boyd Epley developed a chart for predicting the one repetition maximum weight during bench pressing.



(1) The person warms up thoroughly with light weights, calisthenics and stretching exercises.

(2) A weight is selected that is expected to result in failure within the target number of repetitions (see below)

(3) The reps are performed in a slow, continuous manner with no more than 2 seconds rest between lifts.

(4) If the person reps to failure within the repetition limits, then calculate the predicted 1 repetition maximum.

(5) If the person does not rep to failure within the repetition range, let the person recover then try with a lighter or heavier weight as needed.


predicted 1 repetition maximum weight in pounds =

= (0.033 * (number of reps performed) * (weight used in pounds)) + (weight used in pounds)



• According to Mayhew et al (2002) the estimates are about 2 percentage points less than the estimates given by Mayhew equation, up until about 13 repetitions. After this the divergence increases to 7 percentage points at 20 repetitions.


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