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Pathfinder Unchained / Fractional Base Bonuses

Bonuses by Level

Source Pathfinder Unchained pg. 41
The table above presents fractional values for the base save and base attack bonuses. To determine the total base save bonus or base attack bonus of a multiclass character, calculate the fractional values for each of the character’s classes using the table and add them together.

This rule affects only multiclass characters, and such characters will have a number of attacks depending on their combined base attack bonuses from several classes. For this reason, the table does not list the multiple attacks gained by characters with a BAB of +6 or greater. Just remember that a second attack is gained when a character’s total BAB reaches +6, a third at +11, and a fourth at +16, just as normal. For a character who’s an 11th-level fighter and a 9th-level rogue, adding a BAB of +11 to a BAB of +6-3/4 yields a BAB of +17 (rounded down from +17-3/4), with additional attacks with BABs of +12, +7, and +2, respectively.

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Bonuses by Level