http://www.google.com/search?q=how+to+calculate+data+excel&ie=utf-8&oe=utf-8&aq=t&rlz=1R1GGGL_en___US321&client=firefox-a
There are many websites in here that will teach you, depending on what you want to calculate and what form the results will take (percentage, etc.).
How do I calculate data using Excel
2 answers
IF you plan to use Excel in the future, there are good "Excel for Dummies" type books in the bookstore, I recommend them. There are so many things you can do that you cannot possibly remember, and you need a reference.