How to Calculate Yard Gravel
When you are planning a new gravel driveway or want to place some gravel as a foundation for a patio or other area, it is necessary to figure out how much you need. Most companies sell gravel by the cubic yard. Calculating yard gravel requires the length and width measurements as well as the depth you want the gravel. When measuring, always round up rather than round down measurements. It is better to have more than you need than to not have enough for the job.

Measure the length of the area you want to cover with gravel with a tape measure. Write down the next highest whole foot and divide the measurement by three. For example, if you have a 26foot 6inch length, round the measurement up to 27 feet. Divide 27 feet by three and write down the resulting 9 yards.

Measure the width of the area you want to cover. Again, write down the next highest whole foot measurement down on a piece of paper (for example, 9) and divide the measurement by three.

Estimate the total depth you want to cover, expressed in feet, and divide by three. If you want to have a depth of 1 foot, 6 inches, your result would be .50.

Multiply all three measurements together to come up with the total cubic yards necessary for the project. Using the example measurements, 9 X 3 X .50, which equals 13.5 cubic yards.
Things You Will Need
 Tape measure
 Pencil
 Calculator
Tip
 You can also take the measurements in feet and multiply them together then divide the total by 27 (because there are 27 cubic feet in a cubic yard) to get the cubic yards. Using the figures in the example, 27 X 9 X 1.5 = 364.5 feet. Divide the total feet by 27 for a result of 13.5 cubic yards.