Mulch Calculator
Calculate mulch volume for rectangular and circular garden beds. Compare costs between bagged (2 cu ft) and bulk delivery to find the most economical option.
Mulch
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Enter Values
Cost: 2 cu ft Bags
$40.50
Cost: Bulk Delivery
$35.00
Coverage Area
200 sq ft
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0.62 cu yd
Total Mulch Needed
Bagged Options
Bulk Delivery
Savings Tip
Bulk delivery saves $5.50 vs. bagged
Visualize This
1 cubic yard fills a 3 ft x 3 ft x 3 ft box
Covers 200 sq ft at 1" deep
The Formula
Mulch volume is calculated from the bed area and desired depth. One cubic yard covers approximately 162 sq ft at 2 inches deep.
Variable Definitions
Conversion Constant
324 = 27 (cu ft per cu yd) x 12 (inches per ft). Converts area x depth to cubic yards.
Cubic Yard
Standard unit for bulk mulch. 1 scoop from a landscape truck = approx 1 cubic yard.
How to Use This Calculator
- 1
Enter the garden bed length and width in feet.
- 2
Select desired mulch depth (2 inches is standard).
- 3
Choose bed shape (rectangle or circle).
- 4
Optionally enter prices to compare bagged vs. bulk cost.
Mulch is applied in a layer 2-3 inches deep on top of garden soil for weed suppression and moisture retention.
Understanding the Concept
Mulch is typically applied at 2-3 inches for weed suppression and moisture retention. One cubic yard of mulch covers ~162 sq ft at 2 inches deep. For larger areas, bulk delivery is significantly cheaper than bagged. A standard pickup truck can hold about 1-2 cubic yards. Practical example: a rectangular garden bed measuring 20 feet by 10 feet at 3 inches deep needs 200 sq ft of coverage. Using the formula: (200 × 3) / 324 = 1.85 cubic yards. You would need approximately 25 bags of 2-cubic-foot mulch or order 2 cubic yards in bulk. Bulk delivery at $35 per yard costs $70, while bagged at $4.50 per bag costs $112.50 — a clear savings for larger areas. Edge cases: for circular beds, measure the diameter at the widest point but remember that the actual planted area may be less if there are large shrubs or trees in the middle. For sloped beds, slightly deeper mulch helps prevent erosion runoff. Avoid piling mulch against tree trunks (volcano mulching) as it causes bark rot and insect infestation. Gravel or rubber mulch requires different depth calculations — rubber mulch is often applied at just 1-2 inches since it does not decompose.
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