by 
The Curious Bag
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<h4 class="dechead">On One Hand: Get only what you need
If you don't want to risk having more materials than you need, carefully measure the area that you want your brick patio to be. Multiply the length by the width to give you the total square footage. With a standard brick (4 inches-by-8 inches) you need 45 bricks for 10 square feet. For other bricks calculate surface area and divide it into the patio surface area to find out number needed.
On the Other: Plan for the Unexpected or Additional
You can eliminate the risk of running out of bricks in you have 5 percent to 10 percent extra so that you can cover any brick breakage and for keeping for future repairs.
Bottom Line
The number of bricks you need for a patio depends on the size of the patio and whether you prefer to have extra on hand for edging or accents. Having available bricks ready to use for mishaps and mistakes can keep you from running back and buying more midway through the design.
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