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If you have ever stared at the open and empty ground around your trees, shrubs, or any other landscaping projects and though: “How much mulch do I need?” but didn’t know where to start, we can help. At 1-800-MULCH PRO we provide an effective tool that lets you estimate how much you will need to effectively cover any area. The numbers provided by our mulch calculator chart will make it easier to figure out what it will cost to get enough of your choice of organic or synthetic mulch. 

All you need is a couple basic measurements, and the mulch calculator will do the rest. At 1-800-MULCH PRO we are committed to helping you find the information and the professionals you need to complete your projects with the right amount of mulch and very little of it going to waste. Use the calculator to make sure that you aren’t spending too much on your project and then take advantage of our service to find the best mulching suppliers nearest you.


There are several steps you must take in order to determine how much mulch you will need for your project:

Step 1: Measure your Landscape Beds or Area You Wish To Mulch

  • Every landscape is different. You can use this as a guide to determine the square footage of your landscape.

Measuring a Circular landscape bed:


If you have a circular bed you are looking to mulch, you need to measure the radius. The radius is the distance from one edge of the bed to the center of the circle. Multiply the radius by itself. Then multiply the result by (pi) 3.14 to get the area of the circle. For example:

If the radius of the circle is 10 feet, multiply 10 by 10 to get 100, then multiply 100 by 3.14. You get 314 feet. That is the area inside the circle, in square feet.


Measuring a Triangle Landscape Bed


When measuring for mulch in a triangular bed, it gets complicated. To find the area of a triangle, multiply the base by the height, and then divide by 2. (If the base is 5 feet and the height is 3 feet, that would be 5 x 3 = 15, then divide by 2: 

5 x 3 / 2


Measuring a Square or Rectangular landscape bed:

If you are looking to mulch a square or rectangular landscape bed, simply measure the length and the width with a tape measure. Then multiply the length by the width. For example:If your length is 40 feet and your width is 8 feet than the total square footage is 320.

40ft x 8ft = 320


STEP 2: Subtract Plants From Total Square Footage:
You do not need to mulch your plants, just around them. Depending on how many plants, flowers or trees you have in your landscaped bed you may be able to significantly reduce the amount of mulch you will need for your job. In order to subtract the plant occupation you will need to guess the percentage of the total bed you are looking to mulch that is taken up by plants. Use below as a guide.

Generally it’s:
10 % for lightly occupied landscaped beds
15% for moderately occupied landscaped beds

20% for heavily occupied landscaped beds 

STEP 3: Determine The Depth Of Mulch You Would Like To Use

It is recommended that you mulch at a 3 inch to 4 inch depth. Be sure that you do not over-mulch. This can be a real problem. Over applying mulch can lead to your trees and plants dyeing.

STEP 4: Do The Math
To calculate the volume of mulch you’ll need, multiply the square footage of the area to be covered (SF) by the depth of the mulch (DM). Multiply the result by 0.0031 to determine the number of cubic yards you’ll need.

The equation looks like this:
SF x DM x 0.0031 = Cubic Yards. 

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