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Mulch, Soil & Gravel Calculator

Calculate bulk cubic yards and bag counts (2 cu ft & 3 cu ft) for mulch, topsoil, and gravel landscaping beds. Features weight estimates.

Bulk Material Needed (Cubic Yards)
1.4815yd³
Volume in Cubic Feet40 ft³
Standard 2 cu ft Bags (Mulch)20 bags bags
Large 3 cu ft Bags (Mulch)14 bags bags
Approx. Weight for Wood/Bark Mulch0.67 tons (1,333.33 lbs) tons
3D Geometric Profile
Step 1: Calculate Total Coverage Area60 ft²
Formula: Area = Length × Width
Substitution: 10 ft × 6 ft = 60 ft²

Find the total square footage of garden bed or landscaping to cover.

Step 2: Convert Depth to Feet and Calculate Cubic Feet40 ft³
Formula: V_ft3 = Area × (Depth / 12)
Substitution: 60 ft² × (8 in / 12) = 60 × 0.6667 = 40 ft³

Converting layer depth into feet provides the total volume in cubic feet.

Step 3: Convert Cubic Feet to Cubic Yards (divide by 27)1.4815 yd³
Formula: Cubic Yards = Cubic Feet / 27
Substitution: 40 / 27 = 1.4815 yd³

Bulk mulch, topsoil, and gravel suppliers sell by the cubic yard (1 yard = 27 cubic feet).

Quick Answer

Calculates bulk cubic yards for landscape beds: Area (sq ft) × (Depth in inches ÷ 12) ÷ 27. For a 200 sq ft garden bed at 3 inches mulch depth, you need 1.85 cubic yards (or 25 standard 2-cubic-foot bags).

Mulch, Soil & Gravel Calculator Formula & Sizing Rules

Cubic Yards = (Area sq ft × (Depth in / 12)) / 27
Mathematical Variable Legend for Mulch, Soil & Gravel Calculator Formula & Sizing Rules
VariableDefinitionStandard Units
AreaGarden bed or landscape surface areasq ft
DepthTarget layer thickness (typical: 2" to 4")inches

Recommended Material Depths for Landscaping

For flower beds and weed suppression, 3 inches of shredded bark mulch is ideal. For new lawns or raised vegetable garden beds, 4 to 6 inches of topsoil is recommended. For driveways and pathways, 3 inches of crushed stone or gravel over landscape fabric provides a stable surface.

Common Project Sizing Mistakes

  • Applying mulch deeper than 4 inches, which suffocates plant root systems
  • Forgetting that 1 cubic yard equals 13.5 two-cubic-foot bags

Frequently Asked Questions

How many bags of mulch are in a cubic yard?▼
One cubic yard (27 cu ft) equals 13.5 bags of 2-cubic-foot mulch or 9 bags of 3-cubic-foot mulch.
How deep should mulch be applied?▼
A depth of 2 to 3 inches is recommended for established garden beds. More than 4 inches can prevent water from reaching soil.
How many square feet does 1 cubic yard of mulch cover?▼
At 3 inches deep, 1 cubic yard covers 108 square feet. At 2 inches deep, it covers 162 square feet. At 4 inches deep, it covers 81 square feet.
How much does a cubic yard of mulch, topsoil, or gravel weigh?▼
Dry wood mulch weighs 600–800 lbs per yard. Topsoil weighs approx 2,000–2,600 lbs (1 to 1.3 tons) per yard. Crushed stone gravel weighs approx 2,700–3,000 lbs (1.4 to 1.5 tons) per yard.

Authoritative Sources & Reference Standards

  1. Guide for the Use of the International System of Units (SI), NIST Special Publication 811 — National Institute of Standards and Technology (NIST). Verified 2026-10-01.

    Official SI unit definitions, conversion factors (Appendix B), and precision standards for cubic meters, liters, and US customary units.

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Reviewed by:VolumeCalculator.org Editorial Team·Last updated: 2026-10-01
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