Answer: Calculating the number of blocks you will need for your project really depends on the measurements of the blocks themselves. A 20 by 20 foot patio equals 400 square feet. A 12" x 12" block covers an area of one square foot. You will need 400 blocks. The rule of thumb is to order what you need plus 10% extra, in case you have to cut some to make them fit - but make sure you can return the unused material. Other sized blocks or pavers will need new calculations so check with the staff at your local garden center. They have calculation charts for each type brick, paver or concrete block. A weed killer for lawns should take care of the weeds. Best wishes with your project!
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