How this is calculated
Mulch coverage depends on the area of your beds and how deep a layer you want: Volume = Length × Width × Depth. We convert depth from inches to feet, calculate cubic feet, then convert to cubic yards (÷27) and round up to the nearest quarter yard for bulk pricing. Bags are estimated at one standard 2 cubic ft bag per calculation, so you can compare the cost of bagged versus bulk delivery before you order.
FAQ
Typically 2 to 3 inches for most garden beds. Up to 4 inches helps with weed suppression, but avoid piling mulch against plant stems or tree trunks — this traps moisture and invites rot, pests, and fungal disease.
Standard mulch bags hold 2 cubic feet each. This calculator converts your volume into both cubic yards and standard bags, so you can compare pricing between bagged and bulk options.
Bulk delivery by the cubic yard is usually cheaper once you need more than about 3 cubic yards. For small garden beds or touch-up jobs, bags are far more convenient since there's no leftover pile to deal with.
Shredded hardwood or bark mulch is the most common choice, breaking down over 1-2 years to enrich the soil. Cedar and cypress resist decay and repel some insects. Rubber mulch lasts longer but doesn't feed the soil, so it suits playgrounds and paths more than planting beds.
Common Mistakes to Avoid
Piling mulch up against tree trunks and plant stems (a "mulch volcano") — it traps moisture against the bark and invites rot and pests.
Applying mulch thicker than about 4 inches, which can suffocate roots instead of protecting them.
Pro Tips
Refresh just the top inch or two each year instead of stripping and replacing the whole layer.
Keep a few inches of bare soil between the mulch and any trunk or stem.
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