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Mulch Calculator

Dĺžka (stopy)

Šírka (stopy)

Depth (in)

What is Mulch Calculator?

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A mulch calculator determines how many cubic yards of mulch or bark chips are needed to cover a garden bed to a specified depth. Mulch conserves moisture, suppresses weeds, moderates soil temperature, and improves soil as it decomposes.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Mulch Calculator

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1Volume = Length (ft) × Width (ft) × Depth (in) / 324 = cubic yards
2Rule: 1 cubic yard covers 324 sq ft at 1 inch depth
3Recommended depth: 2–4 inches (too thin = weeds, too thick = root rot)
4Around trees: keep mulch 3–6 inches away from trunk ("mulch volcano" harms trees)

Worked Examples

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Example 1

Given:Bed 8 ft × 12 ft · 3 in depth

Výsledok:≈ 0.74 cubic yards mulch needed

Mulch Coverage Guide (1 cubic yard)

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Depth	Coverage	Bags (2 cu ft each)
1 inch	324 sq ft	13.5 bags
2 inches	162 sq ft	6.75 bags
3 inches (standard)	108 sq ft	4.5 bags
4 inches (heavy)	81 sq ft	3.4 bags
6 inches (drainage)	54 sq ft	2.25 bags

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Pro Tip

Buy mulch by the cubic yard from bulk suppliers when covering more than ~6 cubic yards (162 sq ft at 3"). Bulk mulch is 30–50% cheaper per cubic yard than bagged. Use a tarp to protect your driveway.

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Did you know?

The US uses about 20 million cubic yards of mulch per year. Wood chip mulch from arborists is often free — many tree companies will deliver chips directly to homeowners rather than paying disposal fees.

References

›Mulch — Wikipedia

Formula-verified for precision

Reviewed October 2026

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Mulch Calculator