Thank you for using Just Answer!
Attached is a link to a concrete calculator that will breakdown the cubic yards of concrete needed and the number of bags for the pour.
Just enter the variables you provided and the results should be as follows:
0.22 yards of concrete needed. 20 bags of 40 lb pre-mix concrete needed or 14 bags of 60 lb pre-mix concrete or 10 bags of 80 lb pre-mix concrete.
Feel free to post any follow-up questions you may have.