Creatures smaller than Small or larger than Medium have special rules relating to position, reach, and weapon size.
| Size Category | Size Modifier* | Height or Length | Weight | Space | Natural Reach (Tall) | Natural Reach (Long) |
|---|---|---|---|---|---|---|
| Fine | +8 | 6 in. or less | 1/8 lb. or less | 1/2 ft. | 0 ft. | 0 ft. |
| Diminutive | +4 | 6 in. - 1 ft. | 1/8 lb. - 1 lb. | 1 ft. | 0 ft. | 0 ft. |
| Tiny | +2 | 1 ft. - 2 ft. | 1 lb. - 8 lb. | 2-1/2 ft. | 0 ft. | 0 ft. |
| Small | +1 | 2 ft. - 4 ft. | 8 lb. - 60 lb. | 5 ft. | 5 ft. | 5 ft. |
| Medium | +0 | 4 ft. - 8 ft. | 60 lb. - 500 lb. | 5 ft. | 5 ft. | 5 ft. |
| Large | -1 | 8 ft. - 16 ft. | 500 lb. - 2 tons | 10 ft. | 10 ft. | 5 ft. |
| Huge | -2 | 16 ft. - 32 ft. | 2 tons - 16 tons | 15 ft. | 15 ft. | 10 ft. |
| Gargantuan | -4 | 32 ft. - 64 ft. | 16 tons - 125 tons | 20 ft. | 20 ft. | 15 ft. |
| Colossal | -8 | 64 ft. or more | 125 tons or more | 30 ft. | 30 ft. | 20 ft. |
Very small creatures take up less than 1 square of space. This means that more than one such creature can fit into a single square. A Tiny creature typically occupies a space only 21/2 feet across, so four can fit into a single square. Twenty-five Diminutive creatures or 100 Fine creatures can fit into a single square. Creatures that take up less than 1 square of space typically have a natural reach of 0 feet, meaning they can't reach into adjacent squares. They must enter an opponent's square to attack in melee. This provokes an attack of opportunity from the opponent. You can attack into your own square if you need to, so you can attack such creatures normally. Since they have no natural reach, they do not threaten the squares around them. You can move past them without provoking attacks of opportunity.
Very large creatures take up more than 1 square. Creatures that take up more than 1 square typically have a natural reach of 10 feet or more, meaning that they can reach targets even if they aren't in adjacent squares. A creature with greater than normal natural reach usually gets an attack of opportunity against you if you approach it, because you must enter and move within the range of its reach before you can attack it.