Determining the sizes of the many Starfleet ships can be problematic. Occasionally, Paramount provides an exact figure of the length of a given vessel; other times, the size must be deduced from scenes of the Star Trek shows themselves. I have made some approximations regarding these sizes; the methods by which I determined them are listed on this page.

Note: The ships in the starship chart found in the back of the Star Trek Encyclopedia are not to scale. The sizes of the diagrams do not conform to the known lengths of the various Starfleet ships.

I have constructed a separate page dealing with the length of the Akira-class.

The size of the Ambassador-class has been given by Paramount.

The Constellation-class saucer is structured differently than the saucers of contemporary ships (Constitution-class, Miranda-class, etc.). Thus, this size is just an approximation; the actual size may be somewhat different. It could be anywhere from 200 meters to 330 meters.

The size of the Constitution-class has been given by Paramount.

The size of the Constitution-class (Type II) has been given by Paramount.

I have constructed a separate page dealing with the length of the Defiant-class.

The size of the Excelsior-class has been given by Paramount.

There is a small "fin" attached to the back of the engine nacelles of the Excelsior-class (Type II). Thus, this type of ship is approximately 2 meters longer than the standard Excelsior-class.

The size of the Galaxy-class has been given by Paramount.

The size of the Intrepid-class has been given by Paramount.

The Miranda-class saucer and engine nacelles are similar in structure to those of the Constitution-class (Type II) saucer. Using these references, a size of 245 meters can be determined. Previously, I has listed a 225 meter length for the Miranda-class; however, upon further investigation, I have discovered that the smaller length is incorrect.

The length of this class is presumably the same as that of the regular Miranda-class.

The length of this class is presumably the same as that of the regular Miranda-class.

The length of the Nebula-class can be deduced using the Galaxy-class saucer as a reference.

This length is merely a rough approximation. It was determined by scaling the decks and the bridge to a height somewhat smaller than those of most Starfleet ships (since the New Orleans is a warship). The true length could be greater, depending on what methods are used to evaluate the size, especially since no diagrams are available.

The Norway class appears to be a few meters shorter than the Akira-class. At one point in Star Trek: First Contact, a Norway passes just below an Akira, and it appears to be slightly smaller (even when perspective and depth perception are accounted for).

In "Equinox" (VOY), we see two diagrams comparing Voyager and the Equinox. One shows the Equinox to be about 140m, while the others show a length of approximately 180m. Interestingly, the external views of the ship imply a true length of the median of those numbers.

The size of the Oberth-class has been given by ILM.

The size of the Sovereign-class has been given by Paramount and many other "official" sources. However, the Star Trek Encyclopedia uses a 680 meter length for this class of ship. This is most likely just another error in that book.

The length of this class is presumably the same as that of the Miranda-class.

At one point in "Favor the Bold" (DS9), an Akira-class and Steamrunner-class ship are seen traveling within less than 50 meters of each other. The Steamrunner appears to be slightly larger.

The Yeager-class appears to be slightly shorter than the Intrepid-class, assuming that the saucers of the two ship types are the same, and the diagram in the Deep Space Nine Technical Manual is correct.