BuildCalc Pro

Mulch & Soil Calculator

Calculate cubic yards of mulch, soil, compost, gravel, or sand needed for garden beds and landscaping.

How to Use This Calculator

1. Select Imperial or Metric. 2. Choose bed shape: rectangle or circle. 3. Enter dimensions and desired depth. 4. Select the material type for weight estimation. 5. Optionally enter cost per cubic yard. 6. Click "Calculate" for volume and bag estimates. Tip: 2-3 inches is standard mulch depth. For topsoil, 4-6 inches is typical for new beds.

How Much Mulch or Soil Do You Need? A Complete Guide

Landscaping with mulch, soil, or compost is one of the simplest ways to improve your yard's appearance and plant health. The challenge is buying the right amount — landscaping materials are sold by cubic yards, but most homeowners think in terms of area and depth.

The formula is straightforward: multiply length × width × depth (all in feet), then divide by 27 to convert cubic feet to cubic yards. For circular beds, use the formula: π × radius² × depth ÷ 27. Our calculator handles both rectangular and circular shapes automatically.

Recommended mulch depth is 2-4 inches for most applications. Use 2-3 inches around plants and flower beds, and 3-4 inches for weed suppression in open areas. Avoid piling mulch deeper than 4 inches, as this can suffocate plant roots and trap excessive moisture.

Material weight varies significantly. Mulch weighs about 400-800 pounds per cubic yard. Topsoil weighs approximately 2,000 pounds per cubic yard. Gravel can weigh 2,500-3,000 pounds per cubic yard. These weights affect delivery costs and whether you need a truck or trailer.

Buying in bulk (by the cubic yard) is much cheaper than buying bags. Bagged mulch costs roughly $4-$7 per 2 cubic foot bag, which translates to $54-$95 per cubic yard. Bulk mulch delivered costs $25-$50 per cubic yard — roughly half the bagged price.

Frequently Asked Questions

How many cubic yards of mulch for 1000 sq ft?

For 1,000 square feet at 3 inches deep, you need approximately 9.3 cubic yards of mulch. At 2 inches deep, you need about 6.2 cubic yards. Our calculator gives you the exact amount based on your specific depth.

How many bags of mulch equal a cubic yard?

One cubic yard equals 27 cubic feet. Standard mulch bags are 2 cubic feet, so you need 13.5 bags (round up to 14) to equal one cubic yard. Buying bulk delivery is usually cheaper for anything over 3 cubic yards.

What depth should mulch be applied?

Apply 2-3 inches of mulch around plants and in flower beds. Use 3-4 inches for weed suppression in open areas. Never exceed 4 inches as excessive mulch can damage plants by trapping moisture and preventing air circulation.

How much does a cubic yard of topsoil weigh?

A cubic yard of topsoil weighs approximately 1,800-2,200 pounds depending on moisture content. Wet soil can weigh significantly more. Make sure your vehicle or trailer can handle the weight before picking up bulk soil.