Assuming the very basics: stat increase, items and encounters I did this calculation:
How much hits do you need to bring down a monster of your level?
Code:
Lvl 1 - Hits vs Mnstr: 3 Mnstr HPs: 28 AtWill Dmg: 8 Enc.Dmg: 12
Lvl 2 - Hits vs Mnstr: 4 Mnstr HPs: 36 AtWill Dmg: 8 Enc.Dmg: 12
Lvl 3 - Hits vs Mnstr: 4 Mnstr HPs: 44 AtWill Dmg: 9 Enc.Dmg: 13
Lvl 4 - Hits vs Mnstr: 5 Mnstr HPs: 52 AtWill Dmg: 9 Enc.Dmg: 13
Lvl 5 - Hits vs Mnstr: 6 Mnstr HPs: 60 AtWill Dmg: 9 Enc.Dmg: 13
Lvl 6 - Hits vs Mnstr: 7 Mnstr HPs: 68 AtWill Dmg: 9 Enc.Dmg: 13
Lvl 7 - Hits vs Mnstr: 8 Mnstr HPs: 76 AtWill Dmg: 9 Enc.Dmg: 13
Lvl 8 - Hits vs Mnstr: 7 Mnstr HPs: 84 AtWill Dmg: 11 Enc.Dmg: 15
Lvl 9 - Hits vs Mnstr: 8 Mnstr HPs: 92 AtWill Dmg: 11 Enc.Dmg: 15
Lvl 10 - Hits vs Mnstr: 8 Mnstr HPs: 100 AtWill Dmg: 11 Enc.Dmg: 15
Lvl 11 - Hits vs Mnstr: 7 Mnstr HPs: 108 AtWill Dmg: 11 Enc.Dmg: 19
Lvl 12 - Hits vs Mnstr: 8 Mnstr HPs: 116 AtWill Dmg: 11 Enc.Dmg: 19
Lvl 13 - Hits vs Mnstr: 8 Mnstr HPs: 124 AtWill Dmg: 12 Enc.Dmg: 20
Lvl 14 - Hits vs Mnstr: 8 Mnstr HPs: 132 AtWill Dmg: 13 Enc.Dmg: 21
Lvl 15 - Hits vs Mnstr: 9 Mnstr HPs: 140 AtWill Dmg: 13 Enc.Dmg: 21
Lvl 16 - Hits vs Mnstr: 9 Mnstr HPs: 148 AtWill Dmg: 13 Enc.Dmg: 21
Lvl 17 - Hits vs Mnstr: 10 Mnstr HPs: 156 AtWill Dmg: 13 Enc.Dmg: 21
Lvl 18 - Hits vs Mnstr: 10 Mnstr HPs: 164 AtWill Dmg: 14 Enc.Dmg: 22
Lvl 19 - Hits vs Mnstr: 10 Mnstr HPs: 172 AtWill Dmg: 14 Enc.Dmg: 22
Lvl 20 - Hits vs Mnstr: 11 Mnstr HPs: 180 AtWill Dmg: 14 Enc.Dmg: 22
Lvl 21 - Hits vs Mnstr: 9 Mnstr HPs: 188 AtWill Dmg: 19 Enc.Dmg: 27
Lvl 22 - Hits vs Mnstr: 9 Mnstr HPs: 196 AtWill Dmg: 19 Enc.Dmg: 27
Lvl 23 - Hits vs Mnstr: 9 Mnstr HPs: 204 AtWill Dmg: 20 Enc.Dmg: 28
Lvl 24 - Hits vs Mnstr: 9 Mnstr HPs: 212 AtWill Dmg: 20 Enc.Dmg: 28
Lvl 25 - Hits vs Mnstr: 10 Mnstr HPs: 220 AtWill Dmg: 20 Enc.Dmg: 28
Lvl 26 - Hits vs Mnstr: 10 Mnstr HPs: 228 AtWill Dmg: 20 Enc.Dmg: 28
Lvl 27 - Hits vs Mnstr: 11 Mnstr HPs: 236 AtWill Dmg: 20 Enc.Dmg: 28
Lvl 28 - Hits vs Mnstr: 10 Mnstr HPs: 244 AtWill Dmg: 22 Enc.Dmg: 30
Lvl 29 - Hits vs Mnstr: 10 Mnstr HPs: 252 AtWill Dmg: 22 Enc.Dmg: 30
Lvl 30 - Hits vs Mnstr: 11 Mnstr HPs: 260 AtWill Dmg: 22 Enc.Dmg: 30
Assumptions:
Base damage ([W], dice of the power, etc.) = 4
Initial Stat bonus = 4
Encounter damage = 1[W] + 1[W] per tier + Stat Damage + Item Damage
Only encounter powers and at wills are used.
PC making damage is a non-striker.
Monster taking damage is Standard.