Gradient Units

Gradient can be expressed in the following ways:

Units Description  
1 IN ? A ratio of the rise to the run. For example: 1 in 20
PERCENT A percentage. (Rise / Run) * 100
DEGREES An angle in degrees. Arctangent (Rise / Run)
GRADIENT A raw gradient value. Rise / Run
PERMILLE Parts per thousand (Rise / Run) * 1000