Mulch Calculator
Cover your beds to the right depth without over-buying.
Your numbers
$
Your results
Volume (cu ft)
Volume (cu ft)
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Volume (cu yd)
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Bags needed
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Bag cost
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Mulch Calculator by TheCalcTools
How the Mulch Calculator works
Enter the bed area and the depth of mulch.
Volume is area × depth in feet.
Divide by the bag size for the number of bags; buy by the cubic yard when you need more than about 5 yards.
The formula
Cubic feet = area × depth(in) ÷ 12Cubic yards = cubic feet ÷ 27
Worked example
Using the default values shown in the calculator:
| Bed area (sq ft) | 250 |
|---|---|
| Depth (in) | 3 |
| Bag size (cu ft) | 2 |
| Price per bag | $4.5 |
- 250 sq ft × 3 in ÷ 12 = 62.5 cu ft (2.31 cu yd).
- That is 32 two-cu-ft bags, costing $144.00.
Result:
| Volume (cu ft) | 62.5 |
|---|---|
| Volume (cu yd) | 2.31 |
| Bags needed | 32 |
| Bag cost | $144.00 |
Frequently asked questions
How deep should mulch be?
Usually 2–3 inches around plants. Keep it away from stems and tree trunks to avoid rot.
Bags or bulk?
Bags suit small jobs. Bulk delivery is usually cheaper per cubic yard on larger beds.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.