# Mayhew

> 1992

- Equation: `1RM = 100 × w / (52.2 + 41.9 × e^(−0.055 × r))`
- Variables:
  - `w`: Load lifted, same unit as the 1RM.
  - `r`: Repetitions completed.
  - `e`: Euler’s number.
  - `1RM`: Estimated one-repetition maximum.
- Authors: Mayhew, J. L.; Ball, T. E.; Arnold, M. D.; Bowen, J. C.
- Source: Journal of Applied Sport Science Research, 6(4), 200–206
- DOI: [10.1519/1533-4287(1992)006<0200:RMEPAA>2.3.CO;2](https://doi.org/10.1519/1533-4287(1992)006<0200:RMEPAA>2.3.CO;2)