Mulch Calculator
How much mulch do you need? Enter your bed size and depth for yards, bags, and cost.
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Cubic feet needed—
2 cu ft bags needed—
Estimated cost (bags)—
Shop mulch by the bag →
How this calculator works
It multiplies your bed’s length, width and depth to find the volume, then converts that into cubic yards (for bulk) and 2-cubic-foot bags (the common store size).
Worked example — a 20 ft × 5 ft bed at 3 inches deep:
20 × 5 × (3 ÷ 12) = 25 cubic feet → 25 ÷ 27 = 0.93 cubic yards. In bags: 25 ÷ 2 = 13 bags.
Bags or bulk?
Under about 1 cubic yard (~13 bags), bagged mulch is convenient. For larger areas, bulk delivery is usually cheaper per unit — the break-even is often around 1.5–2 cubic yards.
Frequently asked questions
How many bags of mulch are in a yard?
13.5 bags of the standard 2 cubic foot size make up one cubic yard.
How deep should mulch be?
2–3 inches is ideal — enough to suppress weeds and hold moisture without smothering roots.
Planning a landscaping project
Measure each section separately when a bed or lawn is not a perfect rectangle, then add the sections together. Depth, moisture, compaction, and the way a supplier loads material can change the final quantity, so use the result as a purchasing estimate and confirm the supplier's coverage information.
How to use this estimate
- Measure the project in the units shown and recheck your measurements before ordering.
- Use the waste allowance as a planning buffer, not as a substitute for a detailed material takeoff.
- Compare the result with the package yield, coverage, or weight listed by your supplier.
- Prices are user-entered estimates and may change by location, product, delivery, and season.
Accuracy and limitations
Calculapedia provides educational planning estimates. It does not inspect your site, select products, guarantee quantities, or replace a contractor, engineer, architect, building official, or supplier. Confirm the final quantity and any safety or code requirements before buying or building.