How much dodge do I get per point in Dexterity?
After Diablo 3 RoS Patch 2.1, which was release on 8/26/2014,
Dexterity no longer grants Dodge chance.
A character can only get dodge chance from skills now.
According to Click to Loot's combat guide:
Dex range Dodge% per point of Dex
1 - 100 0.100
101 - 500 0.025
501 - 1000 0.020
1001 - 8000 0.010
So, for example, 600 dexterity gives 100*0.1 + 400*0.025 + 100*0.02 = 22%
I was able to confirm these calculations myself on my high-dex character.