Estimate how much compost you need for garden beds, raised beds, lawns, top dressing, soil amendment, and planting areas. Calculate compost volume, cubic feet, cubic yards, bags needed, bagged compost cost, bulk compost cost, and compost coverage.
Rectangular mode:
The calculator multiplies length, width, and compost depth to estimate compost volume.
Round mode:
The calculator uses diameter to estimate circular area, then multiplies by compost depth.
Known area mode:
The calculator uses your entered square footage and compost depth to estimate total compost needed.
Raised bed mix mode:
The calculator estimates compost as a percentage of the total raised bed or garden soil mix.
A compost calculator helps estimate how much compost to buy before improving soil, filling beds, top dressing lawns, or preparing vegetable gardens.
It can help compare bagged compost and bulk compost, estimate total cost, and plan the right amount of compost for garden beds, lawns, raised beds, flowers, trees, shrubs, and planting areas.
Your result shows estimated compost volume in cubic feet and cubic yards, bags needed, estimated bagged compost cost, estimated bulk compost cost, coverage area, compost depth, extra material allowance, and compost mix amount when using the raised bed mix option.
Multiply the area by the compost depth in feet. If your compost depth is in inches, divide it by 12 first. Then divide cubic feet by 27 to convert to cubic yards.
A common compost layer for garden beds is about 1 to 2 inches. Heavy soil improvement may use more, while light seasonal refreshing may use less.
Lawn top dressing often uses a thin layer, commonly around 1/4 to 1/2 inch. Thicker layers may smother grass if spread too heavily.
One cubic yard equals 27 cubic feet. Bagged compost is often sold in cubic feet, while bulk compost is usually sold by the cubic yard.
No. This is an estimate. Actual compost needs can vary based on bed shape, slope, soil condition, settling, compaction, moisture, and spreading depth.