Calculate compost in cubic yards and cubic feet from garden length, width and application depth. Add an allowance for uneven beds and spreading.
Enter your measurements and material details.
A thin top-dressing and a new raised-bed fill use very different compost depths.
Compost volume is area multiplied by application depth. The calculator converts inches to feet, cubic feet to cubic yards and then adds the chosen allowance.
Measure the bed or lawn area receiving compost. Choose the depth based on how the material will be used: top-dressing, soil amendment and bulk bed filling are different applications.
There are 27 cubic feet in one cubic yard.
Depth depends on the application and soil; the calculator does not prescribe a gardening rate.
Yes. Enter the lawn area and a shallow application depth.
A small allowance helps with uneven ground and settling.
No. Compost density varies too much for a reliable generic weight conversion.
Using the example inputs shown in the calculator — Area length (ft) = 20, Area width (ft) = 10, Compost depth (in) = 2, Extra allowance (%) = 5 — the result is 1.3 cubic yards. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Cubic feet: 35 ft³; Area: 200 sq ft. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this compost calculator, the inputs with the greatest practical effect are area length, area width and compost depth. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Compost Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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