OSR-3.x-ACKs Conversion Table

[Zardnaar]

I have decided to make a thread with conversion tables for THAC0 (ToHit Armor Class 0), Base Attack Bonus (BAB) and attack throws (AT) for Adventurer Conqueror King (ACKs). This is so you can use what ever you like in most OSR/3rd ed and ACKs type games. I have been running 2nd ed off and on for the last year along with ACKs and I have plugged BAB into 2nd ed and inverted AC with no problems from a mechanical PoV. One could also plug THAC0 into 3rd ed I suppose. One can also convert OSR material to ACKs as well including old BECMI modules.

THAC0	BAB		AT
20	+0		10+
19	+1		9+
18	+2		8+
17	+3		7+
16	+4		6+
15	+5		5+
14	+6		4+
13	+7		3+
12	+8		2+
11	+9		1+
10	+10		0
9	+11		-1
8	+12		-2
7	+13		-3
6	+14		-4
5	+15		-5
4	+16		-6
3	+17		-7
2	+18		-8
1	+19		-9

AD&D/BECMI AC	3.x AC	ACKs AC
10	10	0
9	11	1
8	12	2
7	13	3
6	14	4
5	15	5
4	16	6
3	17	7
2	18	8
1	19	9
0	20	10
-1	21	11
-2	22	12
-3	23	13
-4	24	14
-5	25	15
-6	26	16
-7	27	17
-8	28	18
-9	29	19
-10	30	20

 

[SirKerry]

Thanks for posting, just what I was looking for.

 

[Zardnaar]

Thanks for posting, just what I was looking for.

Old thread lol.

 

[SirKerry]

Yep, I noticed it was a post from just under a decade ago, but it was literally exactly what I was looking for as I'm converting a bunch of ACKS stuff for (personal) use with the OSE ruleset in Fantasy Grounds.

 

[Zardnaar]

Yep, I noticed it was a post from just under a decade ago, but it was literally exactly what I was looking for as I'm converting a bunch of ACKS stuff for (personal) use with the OSE ruleset in Fantasy Grounds.

Glad to be of service then. It's what I was playing before 5E landed.