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"The Executors lenght has been a debate in the Star Wars community for a good 10-15 years now. Since 1980 it`s lenght has been listed as anything from 4 to 12 times as long as a standard star destroyer. The most commonly used lenght has been 5 times, or 8km, long.
The Eclipse-Class` first mentioned lenght, which was also the first time it appeared if memory serves me right, was stated to be around 17km long in the Dark Empire comics. Later publications has taken the Executor-Class` erroneous lenght of 8km which has circulated for many many years and simply stated that the Eclipse is twice as large/long. This in itself is not entirely false, atleast not if you use the term large. The Eclipse does have a much larger tonage value. While it may not be longer, it is definatly wider in most other directions (up/down and to the sides).
A few official sources, such as X-Wing: The Bacta War novel and the book From STAR WARS to Indiana Jones, has indeed stated the Executor-Class to be 11 times as long as an Imperator-Class (most commonly known as the Imperial-Class or simply ISD) star destroyer in the mid-90`s.
Meanwhile, some of LEC`s own games Dark Forces and Rebel Assault II defied the 8km value with their models, pitching them to be around 11 times as large as the ISD.
Measurements taken in 1998 of the model used in the movies, aswell as screen photo evidence, makes the Executor to be around 17.6km long. This if you take into account that Kuat Drive Yards built all their star destroyers, big and small since the Imperator-Class, with the same specs for the command tower (meaning, while they may look different, they are built after the same specifications (length, width, depth, etc....)).
The same year, StarWars.Com upgraded the Executors lenght to 12.8 km. This is coincidently the same as 8 miles long, suggesting that it`s an effort to amend the 8km falacy to only appear as if simply the wrong unit value has been used (km instead of miles). Atleast that`s my opinion of it. For whatever reason they did it, the value was further supported in the Behind the Magic multimedia-cd LucasArts released the same year. Still, the 8km falacy did lure its way onto the cd anyway, as you`ll find in some places the Executor is stated to be 8km long, and in others it`s 12.8km.
Roughly a year ago StarWars.com stated they did their own measurements of the model used in the films and ended up with a lenght of around 19km, or 12 times an ISD. It is unknown if they took into account the constant command tower specs, but most likely they did not.
Either that, or David West Reynolds did not make exact enough measurements 8 years ago.
Little info is known on how they came to that conclusion (atleast I haven`t found anything), but atleast we know they have measured the model this time.
In either case, saying it is 11 or 12 times as long as an ISD is the correct statement and noone can really arrest you for this.
If you use anything lower or higher though then you better be prepared to back it up with rock solid proof. - Jan Gaarni"