How to Calculate Soil Volume in Raised Beds - Soil Calculator
4.5 cubic feet of compost (4.5 20-quart bags) 1.5 cubic feet of soilless potting mix; ... If you'll be filling more than one raised bed, you may want to buy your soil in bulk — by the cubic foot or cubic yard. Use the Soil Calculator to figure out the total amount of soil you'll need for each bed. ... Use 1/4 cup per square .