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Well, there are many things that need to be considered before you can accurately estimate the cost of building a concrete patio. Firstly, depending on where you live, a building permit may be required and could be expensive. Also, the material you buy depends on your area's climate. For example, if your ground freezes during the winter you will need to buy a special kind of concrete mixture. Ultimately, the cost varies per person/place.
Check out these sites. This has a concrete calculator that will tell you what you need. http://www.raineri-materials.com/redimix/rm-calc.htm http://www.hansonaggeast.com/calc_concrete.cfm
One yard of concrete will cover approximately 90 square feet at a depth of 3-1/2". At an even 3-1/2", you will need just over 3 yards. This does not allow for any footings, turndowns, or a thicker slab.
Depends on the size of your patio.