Welcome to the forum.

If you can achieve the same result by other methods, don't bother with reporting parameters. You said you did the total step length and height as reporting parameters, too? Why? Couldn't those be just length parameters and then you create a new parameter that is the result of some formula between those two values, to get the angle?

Attached is an example of how to obtain a slope in 3 different formats, using the existing parameters:

I found reporting parameters to be useful only in very specific situations:

1. For instance, height and width of a custom curtain panel. This cannot be done with "normal" parameters because this dimensions are defined by the host (Curtain Wall) and not through parameters. Reporting parameters can do this cause they only "read" values and not set them
2. Let's say you have a window divided in two parts with a frame between them. In the old days, you would have to do this:

Width = total width of window. This could be a dimension in the family editor with parameter attached.
Width_left = width of left part. This could be a dimension in the family editor with parameter attached.
Width right = Width - Width left. This could NOT a dimension in the family editor with parameter attached, cause you would overconstrain the family. There is a workaround (width right = width - width left), but that is not always useable (when you need the clear glass width from a 4-piece window this formula would be: width - width glass1 - width glass2 - width glass3 - exterior frame thickness*2 - interior frame thickness*3). Hence the reporting parameter...

For anything else: don't use it. Use one of alf's methods instead.

Wow.. Thanks a lot.
I thought it had to be reporting parameter.. but it doesn't.
I managed to get the slope I wanted. Thank you!