Challenge Rating

A creature's challenge rating tells you how great a threat the monster is. An appropriately equipped and well-rested party of four adventurers should be able to defeat a monster that has a challenge rating equal to its level without suffering any deaths. For example, a party of four 3rd-level characters should find a monster with a challenge rating of 3 to be a worthy challenge, but not a deadly one.
Monsters that are significantly weaker than 1st-level characters have a challenge rating lower than 1. Creatures with a challenge rating of 0 are insignificant except in large numbers; those with no effective attacks are worth no experience points, while those that have attacks are worth 10 XP each.
Some monsters present a greater challenge than even a typical 20th-level party can handle. These monsters have a challenge rating of 21 or higher and are specifically designed to test player skill.

Experience Points

The number of [experience points (XP) a monster is worth is based on its challenge rating. Typically, XP is awarded for defeating the monster, although the GM may also award XP for neutralizing the threat posed by the monster in some other manner. Unless something tells you otherwise, a monster summoned by a spell or other magical ability is worth the XP noted in its stat block.

Experience Points by Challenge Rating

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Challenge	XP
0	0 or 10
1/8	25
1/4	50
1/2	100
1	200
2	450
3	700
4	1,100
5	1,800
6	2,300
7	2,900
8	3,900
9	5,000
10	5,900
11	7,200
12	8,400
13	10,000
14	11,500
15	13,000
16	15,000
17	18,000
18	20,000
19	22,000
20	25,000
21	33,000
22	41,000
23	50,000
24	62,000
25	75,000
26	90,000
27	150,000
28	120,000
29	135,000
30	155,000

Proficiency Bonus by Challenge Rating

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Challenge	Proficiency Bonus
0	+2
1/8	+2
1/4	+2
1/2	+2
1	+2
2	+2
3	+2
4	+2
5	+3
6	+3
7	+3
8	+3
9	+4
10	+4
11	+4
12	+4
13	+5
14	+5
15	+5
16	+5
17	+6
18	+6
19	+6
20	+6
21	+7
22	+7
23	+7
24	+7
25	+8
26	+8
27	+8
28	+8
29	+9
30	+9