Mulch Calculation Formula:
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The mulch calculation converts square footage and depth into cubic yards of mulch needed. This helps gardeners and landscapers determine how much mulch to purchase for their projects.
The calculator uses the mulch formula:
Where:
Explanation: The equation accounts for converting square footage with depth to volume, then converting to standard mulch measurement units (cubic yards).
Details: Accurate mulch calculation prevents over-purchasing (saving money) or under-purchasing (requiring additional trips to the store). It ensures proper coverage for plant health and weed suppression.
Tips: Measure your garden area in square feet, decide on desired mulch depth (typically 2-4 inches), and enter these values. All values must be positive numbers.
Q1: What's the typical mulch depth?
A: For most applications, 2-4 inches is recommended. Use 2 inches for annual beds, 3-4 inches for perennial beds and around trees/shrubs.
Q2: How do I measure my garden area?
A: Break irregular areas into rectangles, calculate each rectangle's area (length × width), and sum them for total square footage.
Q3: Should I account for existing plants?
A: You can subtract approximately 10-20% for established plantings, or measure just the open areas needing mulch.
Q4: How many bags is this calculation?
A: Most bagged mulch comes in 2 cu ft bags. There are 27 cu ft in 1 cu yd, so multiply cubic yards by 13.5 to get number of 2 cu ft bags needed.
Q5: What if I want bulk delivery?
A: Bulk mulch is typically sold by the cubic yard. This calculator gives you the exact amount to order from landscape supply companies.