Compost Calculator
Measure a bed or lawn area, choose a compost depth, and estimate how many bags or cubic yards to buy.
Estimate
0 bags
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Step-based measurements are estimates. For lawns, slopes, and irregular beds, measured dimensions will be more reliable.
Enter your area size and compost settings to calculate the result.
Lawn & Soil
How to use the compost calculator
Compost improves garden beds, lawns, and planting areas, but over-ordering can leave a heavy pile to move. This calculator estimates compost volume from area and depth, then compares bagged planning quantities against cubic yards.
Use lighter depths for top dressing and heavier amounts when building new beds or mixing soil. Compost texture and moisture vary, so bag counts and bulk volume can differ slightly from the estimate.
Planning notes
- Start with measured dimensions when possible, then use the calculator to compare options.
- Use shallow depths for lawn top dressing and deeper layers for new beds.
- Save the estimate to your project when you want it included in the overall material total.
Frequently asked questions
How deep should compost be for top dressing?
Around one quarter to one half inch is common for lawns; garden beds can use more.
Can I use compost instead of topsoil?
Compost is an amendment, not always a full soil replacement. Mix based on the project.