Coins to Gold?

I just bought coins and I wanted to know if they can be converted to gold for my characters. If they can , how is that done?

You can buy gold from other players with coins here:
My Account -> Trade -> choose your realm and character and Item Trade.

Remember that gold squish (50% of all players gold is removed) is about to happen at 4th of january, so best to only buy as much as you will use so you don't lose it in the gold squish.

Selling gold for coins is also a good way to get the BiS items without having to pay real money for them. I sell gold for coins on my multiboxing team and got wrathful weapons on all my characters (5 characters) in 3 weeks by selling crafted items on ah and doing dailies.

Thanks I appreciate the answer. And thanks for the info on Jan 4th, didn't know that was comming