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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.
Brick Calculators and Block Calculators Before you can build a retaining wall or any other masonry wall you will need to be able to calculate the concrete masonry blocks you will need to order.Use this calculator to calculate the amount of concrete block needed to construct a masonry wall.Nick Toth's Retaining Wall.o calculate the quantity of brick or block you need to know what size block or brick you want-the unit dimensions that matter to your quantity is length and height-width won't change the quantity, only the width of the wall you are building.