Estimate how many cubic yards of compost you need. Each dimension has its own unit selector (in/ft/yd/m).
Compost is sold by the cubic yard. Find each area's volume (length x width x depth), divide by 27 for cubic yards. A 1-2 inch topdressing suits most beds; one cubic yard covers about 160 sq ft at 2 inches. Use the unit selector and add a little for settling.
Use the compost calculator for topdressing lawns, amending beds and building new planting areas. The result is based on area and depth, then converted to cubic yards with an allowance for settling.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.