From Gardener's Supply (www.gardeners.com)

Estimate How Much
Mulch You Need

Recommended Thickness for Common Mulch Materials

Bark Mulch, 3-4 in.
Cocoa Hulls, 1 in.
Compost, 1-3 in.
Leaves, 4-6 in.
Peat moss, 1 in.
Pine needles, 1-1 1/2 in.
Straw, 6-8 in.
Wood chips, 2-4 in.

Organic Material Needed to Cover 100-Square-Foot Area

Thickness of
Organic Material
Requirements per
100 Square Feet

6" 2 cubic yards
4" 35 cubic feet (1.3 cubic yards)
3" 1 cubic yard
2" 18 cubic feet
1" 9 cubic feet
1/2" 4 cubic feet
1/4" 2 cubic feet
Note: There are 27 cubic feet in 1 cubic yard.

Source: Plant Science, Cornell University

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Last updated: 7/9/19