Mulch Ring Calculator

Calculate how much mulch you need for tree rings including volume, bags, weight, and cost.

Inputs

Ring Outer Diameter

Inner Diameter (trunk clearance)

Mulch Depth

Mulch Type

Tab to move between fields

Results

Mulch Volume

6.87 cu ft

≈ 10 buckets

Bags Needed (2 cu ft)

Total Weight137 lbs

Estimated Cost$16.00

Refresh Every12 months

How to Use This Calculator

Enter Ring Outer Diameter, Inner Diameter (trunk clearance), and Mulch Depth.
Set Mulch Type.
Review Mulch Volume (cu ft) and Bags Needed (2 cu ft).
Use Total Weight (lbs) and Estimated Cost ($) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Ring Outer Diameter

Ring Outer Diameter	Mulch Volume	Bags Needed (2 cu ft)
3.8	2.64 cu ft	2
8.3	13.33 cu ft	7
14	38.29 cu ft	20
18	63.42 cu ft	32

What each input means

Ring Outer Diameter: Outer diameter of the mulch ring in feet.
Inner Diameter (trunk clearance): Keep mulch 3-6 inches from the trunk. Enter the trunk-free zone diameter.
Mulch Depth: Recommended depth is 2-4 inches. Deeper than 4in can harm roots.
Mulch Type: 1=Wood Chips, 2=Bark, 3=Compost, 4=Pine Straw.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Ring Outer Diameter = 6, Inner Diameter (trunk clearance) = 1, Mulch Depth = 3, Mulch Type = 1 = 4 input(s) provided
Calculate Mulch Volume
Mulch Volume
6.87 = 6.87
Calculate Bags Needed
Bags Needed
4 = 4
Calculate Total Weight
Total Weight
137 = 137
Calculate Estimated Cost
Estimated Cost
16 = $16

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