5
Consult the Size Categories Table in the Monster Manual (p. 6) or the Player's Handbook (p. 191).
The Monster Manual defines creature size as:
how much space a creature of a particular size controls in combat.
Size
Space
Tiny
2.5 × 2.5 ft
Small
5 × 5 ft
Medium
5 × 5 ft
Large
10 × 10 ft
Huge
15 × 15 ft
Gargantuan
20 × 20 ft or larger
A creature's ...
5
There's a little table in the Monster Manual, in the first chapter that explains how stats work. It also gives the space that monsters take up on the battlefield. It's on page 6 of the book.
The spaces are as follows:
Tiny: 2.5 by 2.5ft
Small: 5 by 5ft
Medium: 5 by 5ft
Large: 10 by 10ft
Huge: 15 by 15ft
Gargantuan: 20 by 20ft or larger.
In the case of ...
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