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About This Calculator
Purchasing the right amount of soil for garden beds, raised planters, and landscaping projects requires calculating volume from irregular shapes and varying depths. Too little soil means another trip to the supplier, while too much wastes money and creates disposal problems. This calculator converts bed dimensions into cubic yards or cubic meters and estimates the number of bags needed.
Quick Tips
- 1 One cubic yard of soil covers 108 square feet at 3 inches deep.
- 2 Raised garden beds need a minimum soil depth of 12 inches for vegetables.
- 3 Topsoil weighs about 2,000 lbs per cubic yard — plan delivery accordingly.
Example Calculation
Raised garden bed 8ft x 4ft x 1ft deep.
Volume: 32 cu ft | 1.19 cubic yards | About 16 bags (2 cu ft each) | Weight: ~1,600 lbs moist
How to Calculate Soil Volume
Multiply the length by the width to get the area in square feet. Convert the depth from inches to feet by dividing by 12. Multiply the area by the depth in feet to get cubic feet. Divide by 27 to convert to cubic yards. One cubic yard covers approximately 324 square feet at 1 inch deep.
Choosing the Right Soil
Topsoil is best for general landscaping and filling low spots. Garden soil is enriched with compost for planting beds. Potting mix is lightweight and used for containers. For raised beds, a mix of 60% topsoil, 30% compost, and 10% perlite or vermiculite provides good drainage and nutrients.
Frequently Asked Questions
A cubic yard of dry topsoil weighs approximately 2,000-2,500 pounds (1-1.25 tons). Wet soil can weigh significantly more, up to 3,000+ pounds. This is important for delivery truck capacity and load calculations.
For small areas (under 1 cubic yard), bagged soil is convenient. For larger projects, bulk delivery is more economical. A cubic yard equals about 13-14 bags of 2 cubic feet each, or 27 bags of 1 cubic foot each.
New lawns need 4-6 inches of quality topsoil. For overseeding existing lawns, 1-2 inches of topsoil or compost is sufficient. Garden beds typically need 8-12 inches of enriched soil for healthy root development.