Mulch Calculator
Calculate the cubic yards and bags of mulch needed for a garden bed area and depth.
| Buying Option | Quantity |
|---|---|
| Bulk (by the yard) | 1.85 cubic yards |
| 2 cu ft bags | 25 bags |
Bulk delivery is usually cheaper per cubic yard for larger beds; bagged mulch is easier to haul in a car for small or oddly-shaped beds — both rows describe the same total volume.
- 2 cu ft Bags25
About the Mulch Calculator
This calculator converts a garden bed's area and desired mulch depth into cubic yards, plus the equivalent number of standard 2-cubic-foot bags — the two ways mulch is actually sold, whether you're having it delivered in bulk or hauling bags from a garden center.
It's used every spring or fall when refreshing garden beds, when planning a new landscaping bed from scratch, or when trying to decide whether a bulk delivery is worth it versus a trunk full of bagged mulch for a smaller area.
Enter the bed's square footage and how deep you want the mulch layer, and it returns both the bulk cubic-yard figure and the bagged equivalent side by side, so you can buy however suits the job.
How it’s calculated
Cubic yards are calculated as area (in square feet) times depth (converted from inches to feet by dividing by 12), divided by 27 — since a cubic yard equals 27 cubic feet (3 ft × 3 ft × 3 ft). That same total volume in cubic feet, divided by 2, gives the number of standard 2-cubic-foot bags.
Frequently asked questions
How deep should mulch be applied?
2 to 3 inches is the commonly recommended depth for most garden beds — enough to suppress weeds and retain soil moisture without smothering plant roots or trapping excess moisture against stems and trunks.
Is bulk mulch or bagged mulch cheaper?
Bulk mulch is typically cheaper per cubic yard for larger areas, since you're not paying for bagging, but most suppliers have a delivery minimum that makes bulk impractical for small beds — bagged mulch is usually more cost-effective and convenient below roughly 2-3 cubic yards.
Do I need to remove old mulch before adding new mulch?
Not usually — a fresh layer on top of old, mostly-decomposed mulch is standard practice. If old mulch has built up to more than 3-4 inches total, raking some out first helps avoid smothering roots or creating excessive moisture retention against the soil.
How often should garden beds be re-mulched?
Once a year is typical for most organic mulches, since they break down and settle over time — though a thin top-up rather than a full fresh layer is often enough if the existing mulch hasn't fully decomposed.
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