Volume Calculation:
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The bulk compost volume calculation helps determine how much compost you need for your gardening or landscaping project. It converts area and depth measurements into cubic yards, the standard measurement for bulk compost purchases.
The calculator uses the volume equation:
Where:
Explanation: The equation converts square footage at a given depth into cubic yards, which is how bulk compost is typically sold.
Details: Accurate volume calculation ensures you purchase the right amount of compost - not too little that your project is incomplete, and not too much that you waste money and material.
Tips: Measure your garden area in square feet, decide on your desired compost depth (typically 2-4 inches for top dressing, converted to feet), and enter these values. The calculator will show how many cubic yards of compost you need to order.
Q1: How do I measure my garden area?
A: For rectangular areas, multiply length by width. For irregular shapes, break into smaller rectangles or use online mapping tools to measure.
Q2: What depth should I use for compost?
A: For new gardens: 3-4 inches. For existing beds: 1-2 inches. For lawns: 1/4-1/2 inch. Remember to convert inches to feet for the calculator (divide by 12).
Q3: Why divide by 27?
A: There are 27 cubic feet in 1 cubic yard (3 feet x 3 feet x 3 feet). Bulk compost is sold by the cubic yard.
Q4: Should I order extra compost?
A: It's often recommended to order 10-15% more than calculated to account for settling and uneven application.
Q5: How much does a cubic yard of compost cover?
A: At 3 inch depth: ~108 sq ft. At 1 inch depth: ~324 sq ft. At 6 inch depth: ~54 sq ft.