This is a repost of my Ship Size Comparison Chart, which I originally posted in the Academy forum. While SpiderMitch's Ship Chart is really cool and complete, it doesn't really show the sizes of the various ships against each other. (By intention, he has said, so I'm glad I could fill in that gap) Since we now have a single Federation ship forum, and this might get sticked, I thought I'd repost it.
This is taken from ingame, and all screenshots were taken at a standard distance (I edited a demo) so it should be completely accurate. I added some ship lengths that I researched from Memory Alpha and some other places, and it actually seemed to be pretty accurate. There were some discrepancies, but for the most part I was able to relate length in pixels to meters, which is how I estimated the sizes for those that I could not find listed.
Both a Federation and a Klingon version are included, although I included some Fed ships in the Klingon chart for comparison purposes. The Klingon ships get WAY bigger than the Federation with those carriers, and so their chart is to a smaller scale. (The smallest ships may be a bit harder to see)
Also, just for grins, I've added this chart with the Multi Vector Assault Mode sections, as well as some ships in that range (and the assembled ship) for reference.
FED 1.5 - Added background grid. Added Class F Shuttle and Peregrine Fighter. Corrected name of Dervish to Hermes and Destiny to Trident. Corrected Hermes nacelles, changing Hermes' estimated size and order in chart. Corrected spelling of Saber.
FED 1.4 - Added Oberth
MVAM 1.0 - Initial revision, to display Prometheus MVAM sections.
FED 1.3 - Changed yellow lighting to blue. (changed to Earth sector for screenshots)
KDF 1.0 - Initial revision, including 18 KDF ships, 2 shuttles, 2 fighters (from the carriers) and 6 Fed ships for comparison.
FED 1.2 - Reordered ships in strict order of length.
FED 1.1 - Removed lens flare. Added Delta Flyer and Tal'Kyr shuttles. Doubled up shuttle section. Corrected Assault Cruiser appearance from Noble to Sovereign, and corrected several canon lengths. Corrected Defiant to Tier 4/5.
FED 1.0 - Initial revision, including 23 ships and 3 shuttes. Ships are in order of estimated mass.