Different types of AC

[Tyrael]

I can't find anything in PHB/DMG that explicitly states the different variants of Armor Class and whether or not they all stack. Off the top of my head, there's Dodge AC, Deflection AC, Armor AC, Natural AC...hmm.

What about items? Can you stack a Chain Shirt +3 with Bracers +3, Amulet of NatArmor+3, and Ring of Protection+3?

[Logic]

I can't find anything in PHB/DMG that explicitly states the different variants of Armor Class and whether or not they all stack. Off the top of my head, there's Dodge AC, Deflection AC, Armor AC, Natural AC...hmm.

What about items? Can you stack a Chain Shirt +3 with Bracers +3, Amulet of NatArmor+3, and Ring of Protection+3?

Of that example, the bracers do not stack with the Chain shirt, since both provide "Armor Bonuses" to Armor Class.

[brian c]

Basically, if you have two bonuses with different types, they stack. Two of the same type, you use the higher. The exception is Dodge, which always stacks (two different +1 Dodge bonuses give you +2). Also, Natural Armor stacks with any actual natural AC the creature has.

[Ulzgoroth]

Also, Natural Armor stacks with any actual natural AC the creature has.

That's because items that give natural armor are written as giving an enhancement bonus to your natural armor (which is normally zero for humanoids), rather than giving you a set natural armor value.

[Citizen Joe]

I can't find anything in PHB/DMG that explicitly states the different variants of Armor Class and whether or not they all stack. Off the top of my head, there's Dodge AC, Deflection AC, Armor AC, Natural AC...hmm.

What about items? Can you stack a Chain Shirt +3 with Bracers +3, Amulet of NatArmor+3, and Ring of Protection+3?

I'm getting my numbers from SRD online
ok...
BASE AC 10
Chain shirt give + 4 armour bonus +3 enhancement bonus for a total of + 7
Bracers of armour give a +3 armour bonus (force) which does not stack, but does count for touch attacks
Amulet of Natural armour +3 enhances your natural armour (0) to 3
Ring of Protection +3 give a +3 deflection bonus

Everything but bracers was a different AC bonus source so they all stack for a total of AC 23
for touch attacks, natural armour and armour bonus don't count except for force effects. So you get +3 bracers (armour bonus) and +3 Ring (deflection) for AC 16
Note also that the chain shirt limits your dexterity bonus to no more than +4.

[Person_Man]

There are WotC articles that specifically address this, here, here, here, and here.

[Douglas]

The various bonus types and stacking rules for them are found here in the SRD or on page 21 of the DMG.

[Starbuck_II]

I'm getting my numbers from SRD online
ok...
BASE AC 10
Chain shirt give + 4 armour bonus +3 enhancement bonus for a total of + 7
Bracers of armour give a +3 armour bonus (force) which does not stack, but does count for touch attacks
Amulet of Natural armour +3 enhances your natural armour (0) to 3
Ring of Protection +3 give a +3 deflection bonus

Everything but bracers was a different AC bonus source so they all stack for a total of AC 23
for touch attacks, natural armour and armour bonus don't count except for force effects. So you get +3 bracers (armour bonus) and +3 Ring (deflection) for AC 16
Note also that the chain shirt limits your dexterity bonus to no more than +4.

Bracers only count for Incorporeal touch attacks: That scorching ray: Uses your deflection, Dex, and dodge, but not force, count for that.