Star Trek Starship Size

Perhaps the most important characteristic of a hull is its Size, which dictates the length, beam (width), height, mass and number of decks which the ship possesses. In this system Size is rated along a scale ranging from 1 (probes and small shuttles) to 16 (a large Borg cube), though ships of Sizes beyond 16 may certainly exist.

The accompanying table indicates ranges for the Length, Beam, and Height of ships for each Size category. The ranges are guidelines, so you may vary the entries a little here and there. If your ship has dimensions which fit into different categories (for example, a length of 612 meters [Size 8], a beam of 350 meters [Size 7], and a height of 130 meters [Size 8], usually you should use its length to determine its Size, or choose the size into which most of its dimensions fall. The Game Master has the final say on a ship's Size category, and can alter various parameters if they don't fit their preconceptions of what a particular ship should be like.

Size	Length Range	Beam Range	Height Range	Minimum Hull	Maximum Hull
1	1 - 5 m	1 - 4 m	less than 2 m	1D	4D
2	6 - 50 m	4 - 10 m	2 - 5 m	1D	4D+1
3	51 - 99 m	11 - 25 m	6 - 20 m	1D+1	4D+2
4	100- 149 m	26 - 49 m	21 - 30 m	1D+1	5D
5	150 - 299 m	50 - 99 m	31 - 49 m	1D+1	5D+1
6	300 - 399 m	100 - 199 m	50 - 79 m	2D	6D
7	400 - 599 m	200 - 399 m	80 - 99 m	2D	6D+1
8	600 - 699 m	400 - 549 m	100 - 199 m	2D+2	6D+2
9	700 - 799 m	550 - 699 m	200 - 299 m	2D+2	7D
10	800 - 999 m	700 - 799 m	300 - 399 m	3D	7D+1
11	1,000 - 1,499 m	800 - 999 m	400 - 599 m	3D+1	7D+2
12	1,500 - 1,999 m	1,000 - 1,199 m	600 - 799 m	3D+2	8D
13	2,000 - 2,999 m	1,200 - 1,499 m	800 - 999 m	4D	8D+2
14	3,000 - 3,999 m	1,500 - 1,999 m	1,000 - 1,199 m	5D	10D
15	4,000 - 4,999 m	2,000 - 2,499 m	1,200 - 1,499 m	5D+2	11D+2
16	5,000 - 5,999 m	2,500 - 2,999 m	1,500 - 1,799 m	7D+2	14D+2

• Hulls: The Minimum ratings are the same for both Starfighter and Capital Scale ships. Maximum Hull ratings for Starfighter scale ships is twice the listed number. For example, a Starfighter scale Size 2 ship would have a Minimum Hull rating of 1D and a Maximum Hull rating of 8D+2, while a Capital scale Size 2 ship would have a Minimum Hull rating of 1D and a Maximum Hull rating of 4D+1.

Source

• Spacedock: The Advanced Starship and Construction Manual (page 17)
• thedemonapostle