First Edition AD&D
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Advanced D20

Here are the 1st Edition AD&D combat matrices converted without compromise to 3rd edition D&D base attack bonuses.

CLERIC, DRUIDS,AND MONKS
Character BASE ATTACK BONUS PERFECT HITS on a roll of 20
Level Normal Medium Long Opponent's AC
1 to 3 0 -2 -5 20-25 (0 to -5)
4 to 6 2 0 -3 22-27(-2 to -7)
7 to 9 4 2 -1 24-29 (-4 to -9)
10 to 12 6 4 1 26-31(-6 to -11)
13 to 15 8 6 3 28-33 (-8 to -13)
16 to 18 10 8 5 30-35 (-10 to -15)
19 + 11 9 6 32-37(-12 to -17)

 

FIGHTERS, PALADINS, RANGERS, BARDS, AND 0 LEVEL HALFLINGS
AND HUMANS
Character BASE ATTACK BONUS PERFECT HITS on a roll of 20
Level Normal Medium Long Opponent's AC
0 -1 -3 -6 19-24 (1 to -4)
1 to 2 0 -2 -5 20-25 (0 to -5)
3 to 4 2 0 -3 22-27(-2 to -7)
5 to 6 4 2 -1 24-29 (-4 to -9)
7 to 8 6 4 1 26-31(-6 to -11)
9 to10 8 6 3 28-33 (-8 to -13)
11 to 12 10 8 5 30-35 (-10 to -15)
13 to 14 12 10 7 32-37(-12 to -17)
15 to 16 14 12 9 34-39 (-14 to -19)
17 + 16 14 11 36-41(-16 to-21)

 

MAGIC-USERS AND ILLUSIONISTS
Character BASE ATTACK BONUS PERFECT HITS on a roll of 20
Level Normal Medium Long Opponent's AC
1 to 5 -1 -3 -6 19-24 (1 to -4)
6 to 10 1 -1 -4 21-26 (-1 to -6)
11 to 15 4 2 -1 24-29 (-4 to -9)
16 to 20 7 5 2 27-32 (-7 to -12)
21 + 9 7 4 29-34 (-9 to -14)

 

THIEVES AND ASSASSINS
Character BASE ATTACK BONUS PERFECT HITS on a roll of 20
Level Normal Medium Long Opponent's AC
1 to 4 -1 -3 -6 19-24 (1 to -4)
5 to 8 1 -1 -4 21-26 (-1 to -6)
9 to 12 4 2 -1 24-29 (-4 to -9)
13 to 16 6 4 1 26-31 (-6 to -11)
17 to 20 8 6 3 28-33 (-8 to -13)
21 + 10 8 5 30-35 (-10 to -15)

 

MONSTERS (INCLUDING GOBLINS,
HOBGOBLINS, KOBOLDS AND ORCS)
Monster BASE ATTACK BONUS PERFECT HITS on a roll of 20
Hit Dice Normal Medium Long Opponent's AC
up to 1-1 -1 -3 -6 19-24 (1 to -4)
1-1. 0 -2 -5 20-25 (0 to -5)
1 1 -1 -4 21-26 (-1 to -6)
1+ 2 0 -3 22-27 (-2 to -7)
2-3+ 4 2 -1 24-29 (-4 to -9)
4-5+ 5 3 0 25-30 (-5 to -10)
6-7+ 7 5 2 27-32 (-7to -12)
8-9+ 8 6 3 28-33 (-8 to -13)
10-11+ 10 8 5 30-35 (-10 to -15)
12-13+ 11 9 6 31-36 (-11 to -16)
14-15+ 12 10 7 32-37 (-12 to -17
16+ 13 11 8 33-38 (-13 to -18)

 

ARMOR CONVERSION
Original Interpreted
-10 30
-9 29
-8 28
-7 27
-6 26
-5 25
-4 24
-3 23
-2 22
-1 21
0 20
1 19
2 18
3 17
4 16
5 15
6 14
7 13
8 12
9 11
10 10

 

 

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