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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.