Fleet Charts
The fleet charts provide a size comparison of canon Federation and alien ships. The charts only include vessels whose structure or on-screen evidence allows at least a coarse size estimation and only if a good side view is available. Please note that not necessarily the "official" sizes as in print publications are listed. Many ship sizes are controversial because the evidence is contradictory.
Charts
Annotations
Fleet Charts in TIFF Format - the above charts in the same resolution but higher quality
Fleet Chart Annotations - the above charts, along with the sources and references for the ship lengths 
See Also
Starship Size Table - a list of starship sizes as given in several publications
Starship Sizes - some general thoughts about how to determine a ship's size
Credits
Thanks to Boris S. for compiling the sizes of some alien ships. Side views are created from actual CG models or taken from official publications wherever possible. Thanks to Alexander Hartmann, Chris Spinnler, Black Knight, Masaki Taniko, Masao Okazaki, Michael Swantak, Kristian Trigwell, jbobroony, Admiral Horton and Valdore17 for some of the ship diagrams. A number of images from the Star Trek Fact Files have been provided by Neutral Zone Starship Database and The Guardian of Forever. Special thanks to Alice Orbán for preparing some of the images.
Starship Size Comparison @ Star Trek Minutiae
