Approximating CR

Traps/Hazards/Skill Challenges by CR
Desired CR	Low Saving	High Saving	Low Attack	High Attack	Low	Medium Damage	High
	Throw DC	Throw DC	Bonus	Bonus	Damage		Damage
1	9	12	1	2	1d6+2	1d6+2	2d6
2	9	13	3	4	2d6+1	2d6+2	3d6
3	10	14	4	6	3d6	3d6	3d6+2
4	10	15	6	8	3d6+2	4d6	4d6+2
5	11	15	7	10	4d6+1	5d6	5d6+2
6	11	16	9	12	5d6+2	6d6	7d6
7	12	17	9	13	6d6+2	7d6+2	8d6+2
8	12	18	11	15	7d6+2	8d6+2	10d6
9	13	18	12	17	8d6+2	9d6+2	11d6+2
10	13	19	13	18	9d6+2	11d6	13d6
11	14	20	14	19	11d6	12d6+1	14d6+1
12	15	21	15	21	11d6+2	13d6+2	15d6+2
13	15	21	16	22	13d6	14d6+2	17d6
14	16	22	17	23	14d6	15d6+2	18d6+2
15	16	23	18	24	15d6	17d6	20d6
16	17	24	19	26	17d6	19d6+2	23d6
17	18	24	20	27	19d6+2	22d6	25d6+2
18	18	25	21	28	21d6+2	24d6+1	28d6+2
19	19	26	21	29	23d6+2	27d6	31d6+2
20	20	27	22	30	25d6+2	29d6	34d6+1