About the Mulch Calculator
Enter the size of the bed and the depth to spread and get the volume of mulch to order or the number of bags to buy.
Mulch Calculator formula
volume = length × width × depthMulch Calculator
Work out how much mulch you need for a garden bed in cubic metres, yards and bags.
- Enter your numbers
- Results update as you type
- Copy the answer or share the link
Runs in your browser. Your data and files never leave your device.
Results are estimates. Allow for waste, local conditions and supplier guidance before you buy.
Frequently asked questions
How deep should mulch be?
Usually 5–10 cm (2–4 inches). Thicker layers suppress weeds better but keep mulch away from plant stems.
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