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Concrete and mortar are normally sold and used on a cubic volume basis (either cubic feet or cubic yards). Use the following to calculate the amount of concrete you need for a slab:
Cubic feet of Concrete = Slab thickness in feet x Slab width in feet
x Slab length in feet
1 cubic yard = 27 cubic feet
1 cubic foot = 1,728 cubic inches
In using the above equations, note that the volume of the final concrete mixture is approximately two-thirds the volume of the original cement-aggregate mixture. This occurs because the sand and cement fill in the void spaces between the gravel fragments.
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