How many yards are in 1 ton of 3/4 drainage gravel?

I need to buy some gravel for various jobs around the house. Examples are putting drainage pipes around the yard and making a cement patio, putting some under my deck to clean it up etc. Every place I call goes by tons and all I know is I need about 10 yards. Can anyone give me an approximation as to how many yards are in 1 ton of 3/4 drainage gravel?