Wathan

Equation

1RM = 100 × w / (48.8 + 53.8 × e^(−0.075 × r))

Variables

w

Load lifted, same unit as the 1RM.

r

Repetitions completed.

e

Euler’s number.

1RM

Estimated one-repetition maximum.

Year

1994

Authors

Wathen, D.

Source

Essentials of Strength Training and Conditioning, Human Kinetics, pp. 435–439

DOI

None

Notes

Commonly called Wathan; the original author is Wathen.

Estimate a 1RM