Question: Using D20 Stats with GURPS Character Creation

[Dragondog]

Originally Posted by Elliander

For example, so far, NO ONE has provided me information on how to convert monsters on the fly. Multiple people suggested I do that, and one link was shown where people have done it, but when I asked for specifics I just get a cop out so OF COURSE I'm going to pay less attention to people who give half suggestions with little or no relevant details.

For conversion d20 -> GURPS, Ejidoth posted some suggestions for the main stats, though it would have made things clearer if he had chosen not to include the WoD stuff as that didn't pertain to your question. So with some editing of his post, here goes.

Whatever is left of the arrow (->) is the d20 value of the stat and whatever is to the right of the arrow is the comparative GURPS value of the stat. Some of them are ranges, because the stats aren't perfectly comparable.

Originally Posted by Ejidoth

DESCRIPTIVE SCALING

d20 -> GURPS
(this is a decent conversion in general)

    1 -> 1-2
    2 -> 3-5
 3- 4 -> 6
 5- 6 -> 7
    8 -> 8
    9 -> 9
10-11 -> 10
12-13 -> 11
   14 -> 12
   15 -> 13
   16 -> 14
   17 -> 15
   18 -> 16

d20 STR -> GURPS ST
(should be very accurate for the most part)
 
    1 STR -> 5 ST
 2- 4 STR -> 6 ST
 5- 6 STR -> 7 ST
    7 STR -> 8 ST
 8- 9 STR -> 9 ST
   10 STR -> 10 ST
11-12 STR -> 11 ST
   13 STR -> 12 ST
   14 STR -> 13 ST
   15 STR -> 14 ST
   16 STR -> 15 ST
   17 STR -> 16 ST
   18 STR -> 17 ST
   19 STR -> 19 ST
   20 STR -> 20 ST
  +10 STR -> x2 ST

With skill values, I'd go with something like (if we go by the probability to succeed at a dc 10 task).

d20 -> GURPS
1-2 -> 11
3-4 -> 12
5-6 -> 13
7 -> 14
8 -> 15
9 -> 16
10 -> 17

Higher skills would be correspondingly higher. I wouldn't translate the skills themselves to GURPS skills at all, just leave them as is and let them cover what they cover and any other GURPS skill that seems applicable.

For other abilities, I wouldn't change what they cover, but you might have to change the values in ways that make them work with GURPS, e.g. damage compared to HP.

Of course, if you give monsters and PCs alike d20 like HP, that one thing wouldn't be an issue. But you'd have to figure out how to do that as there are no levels and classes in GURPS.