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Refer to the tables below for standard block sizes, including the nominal dimensions. The block’s thickness is not critical to finding how many blocks you need, but it is essential when estimating how much mortar and other masonry material you need. The most common sizes are 8″ high by 8″ wide and 8″ high by 16″ wide in varying thicknesses. You’ll need to know the size of the concrete block you’ll be using to determine how many blocks you need for your project.
#Building estimate calculator professional
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#Building estimate calculator install
Tools Needed to Install a Concrete Block Wall Use our block fill calculator to estimate the fill volume. Finally, divide cubic inches by 46,656 to find cubic yards of concrete needed. Multiply the cubic inches by the number of voids in the wall, typically 2 per block. Measure the length, width, and height of the void in inches, then multiply to get the void’s cubic inches. Try our mortar calculator to calculate how many bags are needed.Įstimating the concrete needed to fill the voids in concrete block involves finding the volume of the void in the block being used and multiplying that by the number of voids in the wall. You can also purchase pre-mixed bags of mortar, which generally yield around 12 blocks per 80-pound bag. Standard mortar requires a 1:3 cement to sand mix, which amounts to 1 yd 3 of sand for every seven bags of cement. On average, it takes about three bags of cement for every 100 blocks.ĭivide the number of blocks being installed by 33.3 to calculate how many bags are needed. Our calculator above may indicate a different quantity of blocks needed since it uses a more precise formula, accounting for partial blocks and cutoffs automatically.Ĭalculating the amount of mortar needed for the joints in a concrete block wall will vary depending on the mortar mix you use. We recommend adding 5%-10% additional blocks to account for broken blocks or blocks that need to be cut for the edges. If you’re using a standard 16″ x 8″ x 8″ block, find the number of blocks needed by dividing the wall square footage by 0.89. Multiply 16×8, and then divide by 144 to get the answer. The standard block size is 16″ wide x 8″ high. Now you need to figure out the square footage of the block you are using. Wall sq ft = width × height Step Two: Find Block Square Footage Once you have the wall measurements, calculate the square footage by multiplying the width times the height. There are several formulas to figure out how many concrete blocks are necessary for a wall project, but you’ll need to start by measuring the wall’s width and height in feet. If you’re building a retaining wall, then try our retaining wall calculator. Note: Retaining walls are a bit different from a typical concrete block wall.
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Simply enter the dimensions of your wall project, and the concrete block calculator will figure out how many blocks you need. Keep reading to learn the process to calculate the number of concrete blocks you need, or just use the calculator above. A concrete block wall typically requires 1 1/ 8 blocks per square foot.