Calculating Circles

Example 1 - Length Around a Circle

(Diameter x 3.1416 = Linear Feet Around a Circle)

Sample, 18' round Swimming Pool:

• 18' x 3.1416 = 56.55' (total linear feet around pool)
• To add 2' of stone around this pool 3" deep:
  56.55' x 2' = 113.10'
• 113.10' x 0.25 (3" depth) = 28.28 Cubic Feet
• 28.28 / 27 = 1.05 Cubic Yards

Example 2 - Square Footage Inside a Circle

(Length x Width x 0.7854 = Square Feet)

Sample, 24' round Swimming Pool:

• 24' x 24' = 576'
• 576' x 0.7854 = 452.39 Square Feet (total inside pool)
• To add 4" of sand evenly across pool:
  452.39' x .33 (4" 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.