Slope Calculation Plugin?

wyldscape

Hi, I'm a Landscape Architect, we do a lot of site grading which involves disabled ramps, walkways and landings. Is there a script out there that can calculate the slope of a surface for me? As in 1:16 (6.3%), 1:20 (5.0%), 1:6 (16.7%). That sort of thing.

Revit has a tool which has 'Spot Elevation' 'Spot Coordinate' and 'Spot Slope'. I'm not comparing the two but would love if sketchup had a plugin which could provide these features.

Cheers