Size

Tiny (<=2ft base, 2ft height)
Small (2-4ft, 2-4ft height)
Medium (4-7ft base, 5-7ft height)
Large (7-10ft base, 7-10ft height)
Huge (10-15ft base, 7-25ft height)
Gargantuan (>15ft base, >15ft height)
Astronomical (>5 mile base, >1 mile height)