Mulch Annulus Calculator

Need to place mulch around a tree or in a circular border? This calculator determines exactly how much mulch is needed for a ring (annulus) shape.

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How to Use

  1. 1

    Step 1

    Choose your unit system (Imperial or Metric).

  2. 2

    Step 2

    Enter the Outer Radius of the entire mulch bed.

  3. 3

    Step 3

    Enter the Inner Radius (the empty space in the middle, like the tree trunk).

  4. 4

    Step 4

    Enter your desired mulch depth.

  5. 5

    Step 5

    Click Calculate to get the volume in yards and the number of bags.

Frequently Asked Questions

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