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Probability Table

From PDX GURPS

Because GURPS uses 3d6, understanding the probability of rolling under a target can be non-intuitive, especially when coming from other RPG systems.

To that end, here is a table showing you the likelihood of rolling at or below a target.

# Success
3 0.46%
4 1.85%
5 4.62%
6 9.25%
7 16.2%
8 25.92%
9 37.5%
10 50%
11 62.5%
12 74.07%
13 83.79%
14 90.74%
15 95.37%
16 98.14%
17 99.53%
18 100%