Yes, that is correct, and the disparity in BAB becomes more evident
the more classes you have and the greater the difference between them.
This is especially true of prestige classes.

Take a not uncommon build: Rogue 3/ Wizard 5/Arcane Trickster 2.

Here we have a 10th level caster, if he was straight rogue he'd have a
+7 BAB, instead he's got a +5, +2/+2/+1 respectively.

Regards,
-Benjamin

On Wed, Jul 1, 2009 at 14:22, Philip "thecimmerian"
Senturia<thecimmerianebay@...> wrote:
>
> But let's say you are 5th and 5th level (10th total).  You would have a +6 BAB
by adding 3 and 3 together, but you would have had +7 if you were 10th in either
one of the classes.  I assume this is a penalty for multi-classing, assuming my
calculation is accurate.  Is it accurate?
>
>
> Philip Senturia
> thecimmerianebay@...
>
> --- On Wed, 7/1/09, Mr Jay Fisher <rhikhan@...> wrote:
>
>
> For your second question, I'm not sure what you are asking as the BAB is
precisely laid out for each class and level.  For example: If you are using a
class that has a medium BAB advancement rate, you have a +0 +1 +2 +3 +3 +4 +5 +6
+6 +7, etc. progression.  If you are 4th level going to 5th, you do not get an
additional BAB until you get to 6th level.  If you are multiclassed (say for
example, 4th level and 5th level), you add the two BABs together (you are
actually 9th level in this example).  So you would have a BAB of +6 (which is
what you would have anyway if you were 9th level with a single class on this
progression) .  The same holds true when multiclassing on fast or slow
progressions as well.
>
> Clear as mud?  :-)
>
> Jay Fisher
> LSJ Campaign Coordinator
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