Q:

# How can the amount of concrete blocks needed for a project be calculated?

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Calculate the number of concrete blocks needed for a project by determining the number of blocks to complete a row and the rows to reach the desired height. Standard blocks are 8 inches by 16 inches, including the mortar joints.

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To determine the number of blocks per row, a mason first measures the length of a wall in feet. He rounds any measurements over an even foot to the next number and determines the number of blocks each row requires by multiplying the measurement by 0.75. He calculates the number of rows by multiplying the height of the wall by 1.5. The total number of blocks to complete the project is the product of the blocks in a row times the number of rows. Concrete block suppliers recommend adding 5 to 10 percent to account for breakage and errors.

Manufacturers state the size of the block using width by height by length, so a 6 x 8 x 16 concrete block has a face size of 8 inches high and 16 inches long with a 6-inch width. While the face size remains the same for most concrete blocks, thickness varies but does not affect the number of blocks needed. If using blocks with a nonstandard face size, the mason converts the factors by dividing both height and width by 12.

## Related Questions

• A:

Concrete blocks, also known as concrete masonry units, cinder blocks and breeze blocks, come in a number of sizes, depending on the country of origin. Standard U.S. blocks, used throughout most of the world, are 16 inches long by 8 inches wide by 8 inches tall.

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• A:

To install glass blocks, make a frame for the blocks out of 1-by-6-inch lumber, mix glass-block mortar, spread the mortar on the bottom and sides of blocks, and install a layer of blocks from one corner of the frame to the other. Add more mortar, a metal retaining strip and additional layers of blocks.

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• A:

Cinder blocks come in a variety of shapes and sizes, so the weight range of cinder blocks varies significantly. The most commonly sized cinder blocks measure 8 by 8 inches by 16 inches, weigh 37 pounds.