Calculate how much compost you need for garden beds, raised beds, lawns, topdressing, planting areas, and soil amendment projects. Estimate cubic feet, cubic yards, bags, weight, coverage, and total compost cost.
Compost from area:
The calculator multiplies project area by compost depth to estimate the compost volume needed.
Raised bed / rectangle:
Enter length, width, and compost depth to estimate compost for a bed, planter, or rectangular area.
Known volume:
Enter an existing compost volume to convert it into cubic feet, cubic yards, gallons, liters, bags, weight, and cost.
Soil mix compost amount:
Enter total soil mix volume and desired compost percentage to estimate the compost portion of the mix.
A compost calculator helps estimate how much compost to buy before spreading, filling beds, amending soil, or mixing potting soil.
It can be useful for raised beds, vegetable gardens, flower beds, lawns, container gardening, tree planting, soil improvement, and bulk compost delivery planning.
Your result shows compost volume before and after extra allowance, cubic feet, cubic yards, cubic meters, gallons, liters, bags needed, estimated weight, bag cost, bulk compost cost, and total cost. These are planning estimates based on your area, depth, bag size, density, and prices.
Multiply the project area by the compost depth using the same unit. Convert the result to cubic feet, cubic yards, or bags as needed.
For many garden beds, a 1 to 2 inch layer is common for yearly amendment, while new beds may use a deeper layer depending on soil condition.
One cubic yard equals 27 cubic feet.
Bags can be easier for small projects, while bulk compost is often better for larger beds, lawns, or landscaping projects.