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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.
Use the slab calculator to figure the concrete needed for the porch surface. Use the footing calculator to calculate the sides of the porch and the steps. Here is an example: This porch has 9 sq. feet of porch surface, so enter in the slab calculator 4 thickness by 3' width by 3' length.