How To Calculate How Much Concrete To Buy For Your Project

There are several formulas to know that it will make it easier for you to calculate how many concrete bags to buy for your project. Whatever the size of the bag you planned to use, you can calculate how much concrete to buy.

We know that there are 27 cubic feet on the cubic yard – 3 x 3 x 3. We know that there are 1728 cubic inches in cubic feet – 12 x 12 x 12. You can find more information about the best cement calculator website at .

prism cement

Now we need to know three more things. How many cubic feet have the bag he will make? How many cubic feet do you need for your project? What size bag is brought by your supply builder ?


If you buy a bag 80 #, you can make it. 66 cubic feet of your project. Because we know there are 1728 cubic inches in cubic feet, we multiply 1728 x.66 and find that bag 80 # will do 1140 cubic inches of the project.

Now, let's count the number of cubic inches we need. For example, we want to make some concrete flags for small trails. They will all have the same size – 8 x 12 x 2.5 so 240 cubic inches.

If our project only requires four stones, one bag will do it. If we need 20 stones, we should buy five bags and have some remaining for other projects. If you have a bigger project, you must see some sand sent to your work area and buy a bag of cement Portland. You will save money, but you have to mix your ingredients.