The size of the Enterprise-E

The USS Enterprise (NCC-1701-E) was a 24th century Federation Sovereign-class starship operated by Starfleet. This ship was the sixth Federation starship to bear the name Enterprise.

I never really considered the size of the Enterprise-E until I looked at the LCARS graphics on the Enterprise-E's MSD (Master Situation Display).

There I noticed that the silhouette didn't match the real one of the spaceship.  

So I traced the Tourbolift LCARS graphic and that of the bridge's MSD (which are identical).

screen used tourbolift LCARS grahic by "Star Trek Fact Files"

 According to this MSD the ship has 24 decks.

• The premise for all my deck calculations: a deck is 2.5m + 0.5m for EPS cables, power cables, ... = 3m height for a deck. 
• My calculations follow a purely mathematical approach. I do not compare bridge modules or disk heights with each other. I always pull in decks based on the rows of windows and then calculate a physically plausible room height.

And in fact, with this MSD, the total length of the spaceship is calculated to be 572.2m if one deck has a height of 3m.

A design sketch version was used to draw the decks that didn't correspond to the blueprints of the later model or the CGI Enterprise-E.

design sketch "The Art of John Eaves"

design sketch with MSD overlap

For the correct silhouette I used the CGI image from Santa Barbara Studios' CGI model of the Sovereign-class. (Star Trek: The Magazine Volume 3, Issue 11, page 50). 

Now I compared it with the silhouette of the spaceship. 

Without doing any calculations, it is immediately clear that the total length of the MSD can't be correct because the final blueprint wasn't used for the MSD.

If we now use the height of 3m for a deck, we calculate a total length of 718.8m for the Enterprise-E.
The official length of 685,8m is therefore wrong.
And one more thing: If you look closely at the side view of the Enterprise-E (the real one), it has 26 decks (and not just 24 decks, like in the MSD).

Only in this configuration would the main engineering on deck 16 and the upper shuttle bay in the correct position.

The configurations on the Enterprise-E for Star Trek Nemesis made it slightly shorter because the warp nacelles were raised a little and pushed forward by 3.5%.
Additional phaser strips and photon torpedo launchers have also been added.
In the end the extended saucer detail beside the upper Shuttle bay had no effect at all in the side view because it was too flat to be seen there. Nevertheless, this extended detail gives the appearance of the Enterprise-E a more smooth look.

 This results in a length of 706.1m for the Nemesis configuration.