Landscaping
Landscaping Compost Calculator
Compost for top dressing a lawn or amending a bed, at the rate the job needs.
Result
Top dressing a lawn uses a quarter to a half inch; any more smothers the grass. Amending a bed before planting uses two to three inches dug in. Those are very different rates and using the bed rate on a lawn kills it.
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About this calculator
How much compost for top dressing?
A quarter to a half inch, which is about one cubic yard per 650 to 1,300 square feet. The grass blades should still be visible afterwards.
Can I use too much?
Yes. Burying the crowns of the grass suffocates it, and heavy compost on clay can make drainage worse rather than better.
The formula
cubic yards = area x (depth / 12) / 27
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