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Base Attack Bonus

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Base attack bonus, commonly referred to as BAB, is a characters base modifier to a roll to hit an opponent with a melee attack. A character's BAB determines the number of attacks per round. Many combat feats cannot be taken until a high enough BAB is reached.

Contents

Additional attacks

A character gains a second attack per round when his or her base attack bonus reaches +6, a third with a base attack bonus of +11 or higher, and so forth to a maximum of six attacks at +26 BAB.

When an additional attack is gained the attack bonus for this attack is 5 points lower than the previous lowest attack.

Any other modifiers on attack rolls apply to all these attacks normally, but bonuses do not grant extra attacks.

Example:
A character with +6 BAB has one attack at +6 and a second attack at +1. When this character reaches +11 BAB, this second attack has reached +6 and gains a 3rd attack with +1. If the same character were to use a +5 sword, the number of attacks still remains the same, as the +5 attack bonus from the sword does not count towards number of attacks. Only BAB is used to make that determination.

Multiclassing

When a character multiclasses each class, the BAB progression is based on the class level. Each class provides separate BAB progressions, even if the BAB each class provides is of the same type the progressions do not follow on.

Example:
A level 20 Rogue (a medium BAB) has a +15 BAB, while a character with 10 Rogue levels and 10 Monk (also a medium BAB) levels would gain +7 BAB from each class, for a total of +14 BAB at Character Level 20.
Another example could be a character that (for some reason) had 1 level each of rogue, bard, and cleric - all classes with medium BAB progression. Such a character would have a total of +0 BAB at Level 3.

Multiclass Suggestions:

4 attacks per round (+16 BAB)
≤16 Cleric + ≥4 Fighter
12 Cleric + 4 Rogue + 4 Fighter
12 Cleric + 3 Rogue + 5 Fighter
12 Cleric + 2 Rogue + 6 Fighter
11 Cleric + 4 Rogue + 5 Fighter
8 Cleric + 6 Rogue + 6 Fighter
≥12 Fighter + ≤8 Wizard
10 Fighter + 7 Cleric + 3 Wizard
8 Fighter + 8 Cleric + 4 Wizard

3 attacks per round (+11 BAB)
≤18 Wizard + ≥2 Fighter
16 Wizard + 4 Cleric
≤14 Wizard + ≥6 Cleric

Progression by Class

A character's BAB progression is based on their class or classes.

Tier 1 ( BAB = class level )

  • Fighter
  • Paladin
  • Ranger
  • Barbarian

Tier 2 ( BAB = [class level * 0.75] rounded down )

Tier 3 ( BAB = class level / 2 )

Table

The various progressions are as follows:

Level Tier 1 Tier 2 Tier 3
1 1 0 0
2 2 1 1
3 3 2 1
4 4 3 2
5 5 3 2
6 6/1 4 3
7 7/2 5 3
8 8/3 6/1 4
9 9/4 6/1 4
10 10/5 7/2 5
11 11/6/1 8/3 5
12 12/7/2 9/4 6/1
13 13/8/3 9/4 6/1
14 14/9/4 10/5 7/2
15 15/10/5 11/6/1 7/2
16 16/11/6/1 12/7/2 8/3
17 17/12/7/2 12/7/2 8/3
18 18/13/8/3 13/8/3 9/4
19 19/14/9/4 14/9/4 9/4
20 20/15/10/5 15/10/5 10/5
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