Mulch Calculator for Trees
Estimate mulch for rings around trees and shrubs at a moisture-holding depth.
A mulch ring around a tree is usually 3 inches deep and pulled back from the trunk to avoid rot. For a ring shape, switch the area shape to Border above and enter the outer size and ring width. The calculator starts at 3 inches.
Mulch Calculator
Estimate how much you need — and the cost.
- cubic feet 25
- cubic meters 0.708
- tons (US) 0.37
- tonnes 0.34
Tip: Never pile mulch against the trunk (a "mulch volcano") — leave a few inches of bare soil around the base.
How it's calculated
1 cubic yard covers about 324 sq ft at 1 in deep / about 108 sq ft at 3 in deep; one 2 cu ft bag covers about 12 sq ft at 2 in deep.
See the full Mulch Calculator for the complete how-to, unit conversions, and data sources.
Mulch Calculator for Trees FAQ
How deep should mulch be around a tree?
About 3 inches over the root zone, tapering to nothing at the trunk. Keep it off the bark to prevent rot and pests.
How do I calculate mulch for a tree ring?
Use the Border shape: enter the outer diameter and the ring width. The calculator finds the ring area and applies your depth.