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Here's a good cement calculator to help you figure the amount of cement or concrete you need to do your project. Most people call concrete "cement" when in fact cement is just one ingredient along with sand, aggregate and water that is used to make concrete.
If you're mixing the concrete by hand and you need to calculate the amount of Pre-Mixed concrete bags needed to do your project, this calculator will also figure the amount of bags you need.
Concrete Bag Calculator
How many Bags of Concrete Do You Need?