Sci-Fi Starship Size Comparison Chart. After one glance I snorted, "what, no Death Star?" Asked and answered:
First, the Death Star is so friggin' huge that it doesn't fit on even the largest chart I've made. And that's even for the low-ball estimate of the size, which brings me to my second point: No one can agree just how big the Death Stars actually were, so there's no point in doing their sizes.
That's spectacularly and deliciously nerdy.
Update: The Death Star is listed here. (thx, everyone)