Buying too little potting soil means a second trip to the garden center — the Potting Soil Calculator tells you exactly how much you need before you shop. Select your container shape (rectangular raised bed, circular pot, or tapered flower pot), enter your dimensions and number of containers, and get your soil volume in cubic feet, cubic yards, quarts, and liters.
Soil Needed
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Cubic Yards
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The amount of soil depends on your container's shape and size. Use our calculator to input your container dimensions and get the exact volume needed in cubic feet, yards, and quarts.
For shallow-rooted plants, 12-18 inches is sufficient. Medium-rooted plants need 18-24 inches, while deep-rooted vegetables require 24-36+ inches of soil depth.
Raised bed soil is heavier and designed for larger outdoor containers, while potting soil is lighter with better drainage for indoor pots and smaller containers.
For round pots, measure the diameter and depth. The calculator uses the formula: Volume = π × (diameter/2)² × depth to determine the soil volume needed.
Yes, old potting soil can be refreshed by mixing in compost, new potting mix, or fertilizer. Remove any dead roots and debris before reusing.
A cubic yard of potting soil typically weighs 500-800 pounds, depending on moisture content and soil composition. Dry soil is lighter than wet soil.
You can place cardboard or landscape fabric to suppress weeds, followed by coarse materials like branches or logs (hugelkultur method) to improve drainage and soil structure.