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Irregular areas

Access our Bulk Landscape Materials Calculator Here - Click on the image above.For estimating quantity needed for irregular areas break the area up into smaller workable shapes. Measure each of them and assign them a letter. Calculate square feet for each and add the square footage together to figure total needed.

Rectangle

  1. Measure Length and Width (in feet)
  2. Length x Width = square feet
  3. Determine desired depth of material (see recommended depths and chart below)
  4. Square feet divided by sq. ft. per yard (from chart) = cubic yards needed
  5. Example: A rectangular area 16 feet long by 10 feet wide and you want 4 inches deep of stone.
  6. Calculations:
  7. 16 x 10 = 160 square feet
  8. 160 divided by 81 = 2 cubic yards (81 comes from the chart, 81 is how many square feet 1 cubic yard covers at a 4 inch depth)

Triangle

  1. Measure length and width of 2 sides
  2. Length x Width x 0.5 = square feet
  3. Square feet divided by sq. ft. per yard (from chart) = cubic yards needed
  4. Example: Given a triangle are where one side is 40 feet long, one side is 10 feet long and you want 4 inches deep of mulch or stone
  5. Calculations:
  6. 40 x 10 x 0.5 = 200 square feet
  7. 200 divided by 81 = 2.5 cubic yards (81 comes from the chart)

Circle

  1. Determine radius (1/2 distance of diameter or distance across)
  2. Formula: Radius x Radius x 3.14 = square feet
  3. Square feet divided by sq. ft. per yard (from chart) = cubic yards needed
  4. Example: Given a circle 30 feet across (15 ft radius) and you want 3 inches deep
  5. Calculations:
  6. 15 x 15 x 3.14 = 706.5 square feet
  7. 706.5 divided by 108 = 6.5 cubic yards

Conversion Chart – Square Feet to Cubic Yards

Converts square feet to cubic yards 1 cubic yard will cover the following amount of square feet at the given depth.

  • 1/4" deep 1296 square feet
  • 1" deep 324 square feet
  • 2" deep 162 square feet
  • 3" deep 108 square feet
  • 4" deep 81 square feet
  • 6" deep 54 square feet
  • 12" deep 27 square feet

Recommended Depth of Materials

  • Bark Mulches 3"
  • Stone less than 1" diameter 3"
  • 1-1 1/2" Riverstone 4"
  • Soil for Lush Lawns 4+"
  • Garden Soil in Flower Beds 6-12"
  • Lawn topdressing 1/4"
  • Pathways 4"