Coop Design Math Question

[Mouthpear]

Hello and first post!

So I'm planning my coop right now. I bought the plans off of Etsy (pic below) but will be heavily modifying the design to suit my needs. I'd like to have around 8 chickens. The dimensions of my coop will be 7' x 4', with 3-4 nesting boxes.

Now my biggest question is about the run calculations. The coop will be raised of the ground by around 2', so the space under will also be used for the run. Do I include the 7' x 4' under the coop into my run calculation? I'm planning the external run to be 8' x 8' but if I'm not to include the space under the coop, I understand that I'll need to make it around 8' x 10' to accommodate 8 chickens.

View attachment 3500187

Yes include it.