Size

A creature or an object belongs to a size category: Tiny, Small, Medium, Large, Huge, or Gargantuan. A creature's size determines how much space the creature occupies in combat. An object's size affects its Hit Points.
Creature Size and Space | | Size
| Space (Feet)
| Space (Squares)

| Tiny
| 2½ by 2½ feet
| 4 per square

| Small
| 5 by 5 feet
| 1 square

| Medium
| 5 by 5 feet
| 1 square

| Large
| 10 by 10 feet
| 4 squares (2 by 2)

| Huge
| 15 by 15 feet
| 9 squares (3 by 3)

| Gargantuan
| 20 by 20 feet
| 16 squares (4 by 4)