1. Enter the total weight you lifted. 2. Enter the number of reps you performed. 3. Press Calculate.

The maximum amount of weight you can theoretically move for one repetition while maintaining good form.

There are two primary reasons why people need to find out their one rep max.

Using this simple formula.

(Weight / (1.0278 - (.0278 * Reps)))

The way to figure it out is by walking through each of the calculations, starting with the innermost brackets. Multiply .0278 by the number of Reps you completed. Then subtract the answer from 1.0278. Finally take the weight you lifted and divide it by your previous answer. The result is your One Rep Max.

Remember, the one rep max formula is only an estimate and there are several one rep max formulas available. Your actual one rep max may be higher or lower.