Navid MoazzezNavid Moazzez
Conseil en IA

Free Mulch Calculator (+ Guide)

A free mulch calculator for beds and tree rings, in cubic yards or bags.

Navid Moazzezpar Navid Moazzez·Mis à jour 3 oct. 2026·2 min de lecture·
How much mulch you need
Video on Coverr

See how much mulch your beds need in cubic yards or bags, at the depth Penn State Extension suggests.

1

Your numbers

Add an area for each bed. A circle around a tree takes the distance across it.

2

Your result

Fill in the fields above to see your result.

Try next

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This free mulch calculator works out how much mulch your beds and tree rings need, in cubic yards for a delivery or in bags.

It takes rectangles, circles and triangles, so a bed and the ring around a tree go in together.

I built it because mulch comes in bags and in bulk by the yard, and the count decides which you buy.

Here's how deep to spread it, a worked example, and the mistakes to avoid.

key_takeaways.mdTL;DR

Key takeaways

Penn State Extension suggests a 2 to 4 inch layer, and says more than 4 inches may harm a tree's roots.
For finely textured or double-shredded mulch, it suggests 1 to 2 inches.
Cubic yards = square feet × depth in inches ÷ 12 ÷ 27.
A 20 by 4 foot bed plus a tree ring 8 feet across, at 3 inches, takes 1.21 cubic yards, or 17 bags of 2 cubic feet.

What is a mulch calculator?

A mulch calculator turns the size of your beds and the depth you want into the mulch to buy.

It gives cubic yards for a bulk delivery, and bags of 1.5, 2 or 3 cubic feet.

How deep to spread mulch

Penn State Extension's guide to mulching trees gives the depths, and warns when the layer's too deep.

MulchDepth
Organic mulch2 to 4 inches
Finely textured or double-shredded1 to 2 inches
Poorly drained soilLess

It also says to keep mulch off the trunk: 3 to 5 inches away from young trees, and 8 to 10 inches from mature ones.

Work out your mulch0/4

A worked example

Here's the example the calculator loads: a 20 by 4 foot bed and a tree ring 8 feet across, 3 inches deep.

80 + 50.3 = 130.3 square feet. × 3 ÷ 12 = 32.6 cubic feet, or 1.21 cubic yards. That's 17 bags of 2 cubic feet.

Mistakes to avoid

These are the slips that come up most.

  • Piling mulch against the trunk
  • Spreading more than 4 inches
  • Leaving the depth in inches when dividing by 27

Who is the mulch calculator for?

It's for gardeners and anyone tidying their beds, and these tools help around it.

Spread it 2 to 4 inches deep, and your trees will thank you.

Plan your money with your AI

Take your numbers further in

ChatGPTClaudeGeminiGrokPerplexity

Mulch Calculator FAQs

Questions about the mulch calculator? Here's what to know.

A mulch calculator works out how much mulch your beds need, in cubic yards or bags.

Multiply square feet by the depth in inches, divide by 12, then divide by 27 for cubic yards.

2 to 4 inches, by Penn State Extension, and 1 to 2 for finely textured mulch.

13.5 bags of 2 cubic feet, or 9 bags of 3 cubic feet.

About 108 square feet at 3 inches deep.

3 to 5 inches from young trees and 8 to 10 inches from mature ones, by Penn State Extension.

Yes, switch to meters and type the depth in centimeters.

Yes, it's free with no sign-up.

It runs in your browser, and your numbers stay on your device.

I did.

I'm Navid Moazzez, and I made the mulch calculator as one of my free tools on navid.me.

More about me.

Navid Moazzez

AI business strategist & AI OS builder

Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.

Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.

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