Dungeons & Dragons Banner

D20 System image

DRAGON SPACE AND REACH TABLE

SIZE
SPACE
REACH
Tiny
2.5 ft.
0 ft. (5 ft. with bite)
Small
5 ft.

5 ft.
Medium
5 ft.
5 ft. (10 ft. with bite)
Large
10 ft.
5 ft. (10 ft. with bite)
Huge
15 ft.
15 ft. (20 ft. with bite)
Gargantuan
20 ft.
15 ft. (20 ft. with bite)
Colossal
30 ft.
20 ft. (30 ft. with bite)

A dragon's bite attack has reach as if the creature were one size category larger.
All other attacks are made with the standard reach for the dragon's size.

Based on the entry in Dungeons & Dragons Monster Manual 3.5