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# how to figure cocrete yardage ...

Customer Question
how to figure concrete yardage...
how to figure concrete yardage for a 18ft. by 21ft carport
Submitted: 11 years ago.Category: General
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4/23/2006
Expert: Deborah, Research Analyst replied 11 years ago
Deborah, Research Analyst
Category: General
Satisfied Customers: 3,217
Experience: Past President of City Garden Club, Hobbies of Gardening, Mom/Grandma, International Cooking
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http://www.westrocinc.com/Tips/Figure_Concrete/figure_concrete.html

Here is the website to make the calculation. You could also ask at Home Depot
Expert: John D, BS Degree in Engineering. replied 11 years ago
John D, BS Degree in Engineering.
Category: General
Satisfied Customers: 9,666
Experience: Math, science and 25 years experience in computer programming
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The normal thickness of concrete in driveways is 4 to 5 inches. Using a thickness of 5 inches, here is the yardage:

18 ft x 21 ft x 5/12 ft = 157.5 cubic feet

Since 1 cubic yard = 3'x3'x3' = 27 cubic feet

Hence, the 157.5 cubic feet is equal to 157.5/27 cubic yards = 5.8 cubic yards.

Allowing for waste, you should order 6 yards of concrete.

John D, BS Degree in Engineering.
Category: General
Satisfied Customers: 9,666
Experience: Math, science and 25 years experience in computer programming
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John D, BS Degree in Engineering.
Category: General
Satisfied Customers: 9,666
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Experience: Math, science and 25 years experience in computer programming

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