How Much Soil for a 15-Inch Round Planter?
Calculate the cubic inches and quarts of potting soil needed for a large 15-inch diameter round planter.
How to use this tool
- Select whether your pot is round (cylindrical) or square.
- Enter the inside diameter (or side length) and inside depth in inches.
- The calculator returns the volume in quarts and cubic feet.
Large 15-inch planters are common for tomatoes and shrubs — find the exact soil volume before buying potting mix.
Frequently asked questions
- How much potting soil does a 12-inch pot hold?
- A 12-inch round pot that is 10 inches deep holds about 19.6 quarts (0.65 cu ft) of potting mix. Most bags are sold in 8-quart or 2 cu ft sizes.
- How many quarts in a cubic foot of potting soil?
- One cubic foot equals 25.75 dry quarts. A standard 2 cu ft bag of potting mix holds about 51.5 quarts.