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To calculate the volume of concrete you need, you must measure the surface area of the slab and multiply this by the thickness of the slab. You usually measure the length and width of the slab in feet, thus giving you a value for area in square feet when you multiply them, but you usually measure thickness in inches.
The calculator will estimate the volume of concrete or aggregate needed for your project. To use the calculator: 1  Choose units of measure: English or Metric. 2  Enter the width, length, and thickness of the project.3  Select whether you are measuring thickness in feet or inches. 4  Click Calculate.he calculator will estimate the volume of concrete or aggregate needed for your project. To use the calculator: 1  Choose units of measure: English or Metric. 2  Enter the width, length, and thickness of the project.