Every number on this page is arithmetic you can check: Torchline budgets 1,500 XP per character at level 11 for a standard fight, scales it by party size, then by the difficulty band. Below each table are the SRD 5.1 creatures that actually land in that budget.
Budgets by party size and difficulty
Difficulty
Party of 3
Party of 4
Party of 5
Party of 6
Skirmish — resources barely dented
2,475
3,300
4,125
4,950
Standard — a real fight, rarely lethal
4,500
6,000
7,500
9,000
Hard — someone will probably go down
7,200
9,600
12,000
14,400
Brutal — a character can die here
10,800
14,400
18,000
21,600
These are effective-XP budgets: a group of monsters is multiplied up before it is compared against them, so a budget of 6,000 does not mean 6,000 XP of monsters.
What actually fits, for a party of four
The crowd multiplier is the part that catches people out. Two creatures count for 1.5× their XP, three to six count double, seven to ten count 2.5×, eleven or more count triple. So the XP you can spend per creature falls fast as the group grows.
Skirmish — budget 3,300
A lone threat — about 3,300 XP each (×1 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Giant Ape
Beast
Huge
7
12
157
2,900
Oni
Giant
Large
7
16
110
2,900
Shield Guardian
Construct
Large
7
17
142
2,900
Stone Giant
Giant
Huge
7
17
126
2,900
Young Black Dragon
Dragon
Large
7
18
127
2,900
A pair — about 1,100 XP each (×1.5 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Black Pudding
Ooze
Large
4
7
85
1,100
Chuul
Aberration
Large
4
16
93
1,100
Couatl
Celestial
Medium
4
19
97
1,100
Elephant
Beast
Huge
4
12
76
1,100
Ettin
Giant
Large
4
12
85
1,100
A group of four — about 413 XP each (×2 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Ankheg
Monstrosity
Large
2
14
39
450
Awakened Tree
Plant
Huge
2
13
59
450
Azer
Elemental
Medium
2
17
39
450
Bandit Captain
Humanoid
Medium
2
15
65
450
Berserker
Humanoid
Medium
2
13
67
450
A swarm of eight — about 165 XP each (×2.5 crowd multiplier)