1. Divide the number of square feet by 9 to calculate the equivalent in square yards. For example, if you have 90 square feet, divide 90 by 9 to get 10 square yards. 2. Divide the
http://www.ehow.com/how_7891906_calculatesquarey...

multiply. the width by length ie 18feet x 12feet =216 divide by 9 =24sq yards.
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Knowing how to calculate square footage will come in handy when it comes time to estimate materials for that next doityourself job. You'll save time, money and extra trips to the
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You multiple the width by the length.
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