Using Ability Scores
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Each of a creature’s abilities has a score, a number that defines the magnitude of that ability. An ability score is not just a measure of innate capabilities, but also encompasses a creature’s training and competence in activities related to that ability.

A score of 10 or 11 is the normal human average, but adventurers and many monsters are a cut above average in most abilities. A score of 18 is the highest that a person usually reaches. Adventurers can have scores as high as 20, and monsters and divine beings can have scores as high as 30.

Each ability also has a modifier, derived from the score and ranging from −5 (for an ability score of 1) to +10 (for a score of 30). The Ability Scores and Modifiers table notes the ability modifiers for the range of possible ability scores, from 1 to 30.

Ability Scores and Modifiers

Score

Modifier

1

  • 5

2-3

  • 4

4-5

  • 3

6-7

  • 2

8-9

  • 1

10-11

+0

12-13

+1

14-15

+2

16-17

+3

18-19

+4

20-21

+5

22-23

+6

24-25

+7

26-27

+8

28-29

+9

30

+10

To determine an ability modifier without consulting the table, subtract 10 from the ability score and then divide the total by 2 (round down).

Because ability modifiers affect almost every attack roll, ability check, and saving throw, ability modifiers come up in play more often than their associated scores

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