Mulch Trapezoid Calculator

Calculate the exact volume of mulch needed for a trapezoidal garden bed (a shape with two parallel sides of different lengths). Enter the lengths of the two parallel sides, the height between them, and the mulch depth.

ft
The longest parallel side
The shorter parallel side
Distance between top and bottom width

How to Use

  1. 1

    Step 1

    Choose your unit system (Imperial or Metric).

  2. 2

    Step 2

    Enter the Bottom Width (one of the parallel sides).

  3. 3

    Step 3

    Enter the Top Width (the other parallel side).

  4. 4

    Step 4

    Enter the Height (the straight-line distance between the top and bottom sides).

  5. 5

    Step 5

    Enter your desired mulch depth.

  6. 6

    Step 6

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

Frequently Asked Questions

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