How to Calculate Thickness Gravel for Yard

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The thickness of gravel is a product of the square yardage calculation. Square yardage is the amount of material that is used when it is sold by a supplier. Spreading gravel to a specific depth in your yard will require a predetermined area. To do this you need to take proper measurements and use simple math to calculate the cubic yardage, for the required amount of gravel.

Things You'll Need

  • Tape measure
  • Multiply the width by the length to calculate the square footage. Measure the width and length of your yard where you want the gravel. Make a note of the square footage, such as 100 sq ft.

  • Determine the depth or thickness that you want the gravel, such as 4 inches.

  • Divide 4 by 12 to calculate the amount of feet for four inches. The result is .333 feet.

  • Multiply .333 by the square footage that you calculated in step 1, which is .333*100 for a result of 33.3 cubic feet.

  • Calculate the cubic yardage of gravel by dividing 33.3 by 27 for a result of 1.23 cubic yards.

  • Divide 33.3 cubic feet by 100 for a result of .333 cubic feet. This is the amount of gravel that covers 1 square foot.

  • Divide 27 by .333 to calculate the cubic foot amount for 1 square yard, which is 81. This means that an area the measures 9 foot by 9 foot can be covered with 4 inches of gravel.

Tips & Warnings

  • Add 10 percent to the total cubic yard amount of gravel that is spread in your yard to allow for settling.

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References

  • Big Book of Home How-To; Better Homes and Gardens; 2003
  • Photo Credit Jupiterimages/Photos.com/Getty Images
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