How to measure
Use the inside measurements of a raised bed and the actual depth you need to fill.
How the estimate works
Inside length × width × fill depth ÷ 12, with depth in inches. Add allowance and round to full bags.
A worked example
An 8 × 4 ft bed filled 12 in deep needs 32 cubic feet. With 10% allowance, buy 24 bags of 1.5 cubic feet.
Before you buy
Settling varies by soil blend. The allowance is adjustable; this tool does not prescribe a growing mix. Default values are illustrative starting points. Check the label and adjust them to your product.