Expanding on the first calc on Sora's page.

[Zevind]

When the calc was presented, on Ansem's 6th report, it noted that it was only one world, specifically, that was planet sized. Perhaps I am reading this wrong, but is it proper to assume all of the worlds were planet sized?

 

[KuuIchigo]

They are planets. Check here.

 

[Zevind]

I must've gotten confused when reading the entire thing on the wiki.