1RM calculator for Deadlift (Mayhew Ecuation)
With this calculator you can find out your 1RM approximate in deadlift, using the Mayhew equation.
Calculating the 1RM in deadlift is important to determine the intensity in a training program, which will help achieve the goals. Traditionally, various equations have been used to estimate the 1RM. Among the best known are the formulas of Epley (1985) and Brzycki (1993). All these equations have a certain margin of error, as they are not based on direct 1RM tests, but on projections derived from submaximal loads. The accuracy of these equations varies depending on the exercise. In an analysis conducted by LeSuer et al. (1997), it was investigated which equations offered the most accurate predictions of the 1RM in the three main powerlifting exercises.
For the specific case of the squat, it was concluded that the equations of Epley (1985) were the most accurate in terms of precision and lower margin of error. The margin of error is approximately 3% and 2%, respectively (according to studies).
In any case, it is always advisable that, if you want to achieve a lower margin of error and adjust the result to each personal case, you provide two different weights taken to failure and the number of repetitions performed with each weight:
However, knowing these margins, we have tried to optimize the accuracy of the estimation by applying a specific correction factor for each formula. In this way, by entering the weight lifted and the repetitions performed to failure, the calculator applies the following process:
- Epley: Calculates the 1RM using the original formula, correcting the final result with an adjustment that reduces the margin of error to 3%.
- Wathan: Applies its formula with an adjustment that minimizes the margin of error to 2%.
