800 SF around a pool as large as yours actually seems a little light IMHO. I have a pool that measures 103 LF and 550SF and am installing 1100 SF of decking during my planned renovation. How wide are your pathways around your pool? I currently have 3' cement decking at the slimmest points around my pool and am replacing the slimmest points with 5' paver decking, and expanding the paver area significantly on one side of the pool. I'm actually looking at closer to 1600 SF total paver decking all told.
For deck calculations I'm fortunate in that I'm doing a reno, and could easily use Google Maps to draw out the decking dimensions and then Google Maps calculates the square footage, and then I simply subtracted 550 SF for the pool itself. Poof, instant SF calcs. Unless you have very recent satellite footage for your area that has your pool already in the pics, you won't be so lucky.