What will be my roof Pitch?

I'm building a greenhouse from old windows. We've done a rough layout of what windows go where and I'll build the length/width/height based on that. This is the side view, with the rough measurements. What will the roof pitch be? Roof calculators want me to type in the roof pitch, but that's what I'm trying to figure out.

 

My math my be rusty, but I think you’ll end up with about 4:12

 

Rusty but correct.

Don't forget to calculate for your overhang as well.

 

Thanks. I haven't decided what that will be yet, but it will overhang on all four sides.

 

I concur. I got 4.1428571429 as the pitch, to be precise.