Enter the vertical rain speed (m/s) and the horizontal rain speed (m/s) into the Rain Angle Calculator. The calculator will evaluate the Rain Angle.

## Rain Angle Formula

The following two example problems outline the steps and information needed to calculate the Rain Angle.

RA = ATAN ( RSY / RSX)

Variables:

- RA is the Rain Angle (degrees)
- RSY is the vertical rain speed (m/s)
- RSX is the horizontal rain speed (m/s)

To calculate the rain angle, take the inverse tangent of the vertical rain speed over the horizontal rain speed.

## How to Calculate Rain Angle?

The following steps outline how to calculate the Rain Angle.

- First, determine the vertical rain speed (m/s).
- Next, determine the horizontal rain speed (m/s).
- Next, gather the formula from above = RA = ATAN ( RSY / RSX).
- Finally, calculate the Rain Angle.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

vertical rain speed (m/s) = 5

horizontal rain speed (m/s) = 3

RA = ATAN ( RSY / RSX)** **= ?