Probabilities – 3D6 System

Here are the probability tables for success in the 3D6 system.

Difficulty / Score	1	2	3	4	5
Easy — 1 success	42.1%	70.4%	87.5%	96.3%	99.5%
Average — 2 successes	7.4%	25.9%	50.0%	74.1%	92.6%
Difficult — 3 successes	0.5%	3.7%	12.5%	29.6%	57.9%

Difficulty / Score	1	2	3	4	5
Easy — 1 success	51.8%	80.2%	93.8%	98.8%	99.9%
Average — 2 successes	13.2%	40.7%	68.8%	88.9%	98.4%
Difficult — 3 successes	1.6%	11.1%	31.3%	59.3%	86.8%

With only two dice, it is impossible to reach a difficulty of 3 successes.

Difficulty / Score	1	2	3	4	5
Easy — 1 success	30.6%	55.6%	75.0%	88.9%	97.2%
Average — 2 successes	2.8%	11.1%	25.0%	44.4%	69.4%
Difficult — 3 successes	0%	0%	0%	0%	0%

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