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Products from the Earth for Construction, Landscape & Decor

Calculating Circles

How to calculate the length around a circle

Circle Image

Formula: Diameter x 3.1416 = Linear Feet Around a Circle

Example: Length Around an 18 foot diameter round Swimming Pool

18 ft x 3.1416 = 56.55 ft (total linear feet around pool)

To add 2 feet of stone (3 inches deep) around this pool: 56.55 feet x 2 feet= 113.10 feet

113.10 feet x 0.25 (3 inch depth) = 28.28 Cubic Feet

28.28 / 27 = 1.05 Cubic Yards


How to calculate the square footage inside a circle

Image of a circle

Formula: Length x Width x 0.7854 = Square Feet

Example: Square footage inside a 24 foot diameter round Swimming Pool

24 feet x 24 feet = 576 feet

576 feet x 0.7854 = 452.39 Square Feet (total inside pool)

To add 4 inches of sand evenly across pool:
452.39 feet x .33 (4 inches depth) = 149.29 Cubic Feet

149.29 / 27 = 5.53 Cubic Yards

To be safe, always round up. You would order 6 Cubic Yards of sand.

Driveway/Pad Coverage

How to calculate coverage for a standard driveway or pad

Formula: Diameter x 3.1416 = Linear Feet Around a Circle

Example: Length Around an 18 foot diameter round Swimming Pool

18 ft x 3.1416 = 56.55 ft (total linear feet around pool)

To add 2 feet of stone (3 inches deep) around this pool: 56.55 feet x 2 feet= 113.10 feet

113.10 feet x 0.25 (3 inch depth) = 28.28 Cubic Feet

28.28 / 27 = 1.05 Cubic Yards


How to calculate coverage for an L-shaped driveway or pad

Example: L-Shaped Driveway or Pad to be covered with stone, 7 inches deep. The calculation is done in two sections.

18 feet x 40 feet = 720 Square Feet

10 feet x 40 feet = 400 Square Feet

400 feet + 720 feet = 1,120 Square Feet

1,120 x .58 (7 inch Depth) = 649.60 Cubic Feet

649.60 / 27 = 24.06 Cubic Yards

Aggregate Gradation Chart

Depth Estimating

Depth Chart

  • 1 inch = 0.08 feet
  • 2 inches = 0.17 feet
  • 3 inches = 0.25 feet
  • 4 inches = 0.33 feet
  • 5 inches = 0.42 feet
  • 6 inches = 0.50 feet
  • 7 inches = 0.58 feet
  • 8 inches = 0.67 feet
  • 9 inches = 0.75 feet
  • 10 inches = 0.83 feet
  • 11 inches = 0.92 feet
  • 12 inches = 1.00 feet
  • 13 inches = 1.08 feet
  • 14 inches = 1.17 feet
  • 15 inches = 1.25 feet
  • 16 inches = 1.33 feet
  • 17 inches = 1.42 feet
  • 18 inches = 1.50 feet

General Quantity Formulas

Length x Width = Square Feet

Square Feet x Depth = Cubic Feet

Cubic Feet / 27 = Cubic Yards

Note: When figuring quantities, remember to:

  1. double-check your measurements.
  2. allow for compaction (equals higher yield per CY).
  3. allow for a waste factor.
  4. always round up.

Due to the nature of our earth's products: color, exact sizing, and special characteristics cannot be guaranteed. Please be aware of computer monitors and desktop printers when selecting colors whereas they may appear different from the actual. Please visit our Terms and Conditions quality section for further details.

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