How the mulch calculator works
Multiply length by width for the area, then multiply by the depth in feet to get cubic feet. Divide by 27 for cubic yards. The calculator adds 10% by default because mulch settles and edges are never perfectly flat; you can switch that off.
Worked example. A 10 ft by 10 ft bed at 3 in deep is 100 sq ft. Depth in feet is 3 / 12 = 0.25, so the volume is 100 x 0.25 = 25 cubic feet. Adding 10% for settling gives 27.5 cubic feet, which is 1.02 cubic yards (27.5 / 27). In 2 cu ft bags that is 14 bags (27.5 / 2 = 13.75, rounded up).
Quick reference: how far mulch goes
| Depth | 1 cubic yard covers (sq ft) | One 2 cu ft bag covers (sq ft) | One 3 cu ft bag covers (sq ft) |
|---|---|---|---|
| 1 in | 324 | 24 | 36 |
| 2 in | 162 | 12 | 18 |
| 3 in | 108 | 8 | 12 |
| 4 in | 81 | 6 | 9 |
Coverage before any waste allowance. Most beds look best at 2 to 3 inches.
Buy it delivered in bulk
Need three or more cubic yards? Bulk mulch is sold by the cubic yard and delivered loose. Local landscape suppliers usually quote a delivery fee, so ask for the total before you order.
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Tools you'll want for the job
Spreading mulch goes faster with the right kit.
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Frequently asked questions
- How much mulch do I need for a 10x10 bed?
- At 3 inches deep with a 10% allowance you need about 1.02 cubic yards, or 14 bags of 2 cubic foot mulch.
- How deep should mulch be?
- Two to three inches is the usual range for garden beds. Use the depth slider to see how it changes your quantity.
- Should I buy bags or bulk?
- Bags suit small jobs. For three cubic yards or more, bulk delivery is often cheaper per cubic foot, but delivery fees vary, so compare your local quotes.