Potting Soil Calculator
Free potting soil calculator. Calculate exactly how much soil you need for containers, planters, raised beds, and pots in quarts, gallons, or cubic feet.
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Calculate Potting Soil for Any Container
Whether you're filling a small flower pot, a window box planter, or a large raised garden bed, knowing exactly how much soil you need prevents waste and ensures you buy the right amount. Our calculator supports rectangular, round, and tapered containers with results in quarts, gallons, and cubic feet.
How Soil Volume is Calculated
Soil volume depends on your container's shape. For rectangular containers, multiply length × width × depth. For round pots, use πr²h. Tapered pots require the frustum formula. Our calculator handles all shapes and converts between common units including quarts (the standard for bagged soil) and cubic feet.
Volume Formulas
Rectangular: V = L × W × D | Round: V = πr²h | Tapered: V = πh(r₁² + r₁r₂ + r₂²)/3Why Calculate Soil Volume?
Buy the Right Amount
Avoid multiple trips to the store or having excess soil sitting around.
Save Money
Bulk soil is cheaper per cubic foot than bags. Know your total needs before buying.
Plan Your Budget
Calculate total costs before starting your container garden project.
How to Measure Your Containers
Common Container Gardening Needs
Raised Bed Gardens
Calculate cubic yards for large beds that may need bulk delivery.
Patio Container Gardens
Determine quarts needed for a collection of decorative pots.
Window Boxes
Calculate soil for long, narrow planters mounted under windows.
Grow Bags
Fill fabric grow bags for vegetables, herbs, or flowers.
Frequently Asked Questions
There are approximately 25.7 dry quarts in a cubic foot. A standard 40-quart bag equals about 1 cubic foot.