Mulch quantity planning
Mulch Calculator
Estimate how much mulch you need from the area, layer depth, extra allowance and bag size.
Mulch Calculator
Estimate how much mulch you need from the area, layer depth, extra allowance and bag size.
Mulch estimate
How the estimate works
Plan mulch volume before you buy
Measure the area
Enter the total surface you want to cover with mulch in square metres.
Choose the layer depth
Enter the planned mulch layer in centimetres. A deeper layer requires proportionally more material.
Add an allowance
A small percentage can cover uneven ground, settling and minor measurement differences.
Convert volume to bags
Enter the bag volume in litres to see how many whole bags you need to purchase.
Frequently asked questions
What mulch depth should I enter?
Use the depth you plan to install. The suitable depth depends on the mulch material, plants and purpose, so follow the product or project recommendation.
How is mulch volume calculated?
The calculator multiplies area by layer depth, converts the result to cubic metres and litres, then applies any extra allowance.
Why is the number of bags rounded up?
Bagged mulch is purchased in whole bags, so the calculator rounds up to the next complete bag.