User blog comment:DMUA/Camelot: Blizzardcraft/@comment-28876888-20181204162822

Yes, both of those are plus.

Coincidentally, equation for a volume of a cylinder is pi x r^2 x h

Low-end volume would be pi x (1609.344/2)^2 x 8000 = 1.627e10 m^3

Not sure what you did here