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Estimating Resources


Calculating Circles

How to calculate Linear Feet Around a Circle

circle calc

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

driveway

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

Image of a driveway

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


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

Important

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.
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