Should I include my cover when calculating the amount of colour pages in my book?

No, all of our binding options include the cover printed as standard - when inputting your mono and colour pages, this should match your PDF exactly.

Example a 200 page paperback with with 150 colour pages and 50 mono pages should be detailed as below:

If a page has colour and mono, you would not need to add that as a mono page and colour page.