There is some debate after the release of the trailer from E3 regarding the length of the UNSC Infinity. The trailer says it’s 3.5 miles long. Previous to this it was stated to be 3.5 kilometers long.

To illustrate both sizes, I’ve created two comparison graphics. I had to fudge the perspective in Photoshop to straighten out the Infinity since we as yet do not have a good clean side view of the ship. It’s close enough for this comparison though.

Here is how it stacks up against the UNSC Spirit of Fire, a Star Wars Star Destroyer, and a succession of Empire State Buildings turned on their side to show scale.

This is the Infinity at 3.5 kilometers long (click to make bigger):

This is the Infinity at 3.5 miles long (click to make bigger):

Clearly either way it’s gargantuan next to the other ships. Since the trailer stated miles and this is the newest information, I’m going to go with it being 3.5 miles long.

To show it against something real, here it is placed against midtown Manhattan (New York City, New York). The white line denotes 3.5 miles long. The UNSC would measure from Times Square all the way to the end of Central Park. Folks, that is MASSIVE!