How to Calculate Concrete Curbs & Gutters
Concrete is used for a variety of purposes, one of which is to create curbs and gutters. When filling areas with concrete, it is important to know how much you need so that you purchase the correct amount for your project. You can aptly calculate the concrete needed to create your curbs and gutters by calculating the area of the trench to be filled to create them. Does this Spark an idea?
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Instructions
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Know that the formula for calculating concrete is written as the following: ((Length X Width X Height)/27) X 1.05 = Total concrete needed plus 5% extra. This formula is compatible with measurements calculated in feet. The figure of 1.05 is included because it is usually recommended that you purchase 5% more concrete than what you need to ensure you have enough concrete in the event of mishaps.
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Measure the length, width and height of the trench to be filled to create the curb or gutter, and be sure to measure in feet. For instance, in this example, let's assume that the length of the curb or gutter is 100 feet, the width is 5 feet and the height is 1/3 feet.
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Multiply the length times the width times the height to determine how many cubic feet of concrete you need: 100 ft X 5 ft X 1/3 ft = 166.66 cubic feet.
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Divide the above product by 27 (3 cubic ft X 3 cubic ft X 3 cubic ft) to determine the number of cubic yards of concrete you need to make your curb or gutter: 166.66 cubic ft/27 cubic ft = 6.173 cubic yards. Converting the measurements to yards is essential because concrete is sold in cubic yards.
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Multiply the cubic yards needed to fill the trench by 1.05 to derive the total concrete needed plus 5% extra: 6.175 X 1.05 = 6.481 cubic yards.
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Tips & Warnings
If you measure the curb or gutter in inches, convert the inches to feet before completing the formula to make the ending conversion to yards easier.
Beware of forgetting to convert cubic feet to cubic yards; otherwise, you will not purchase the correct amount of concrete needed to fill your trench to best form your curb or gutter.
