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How many yards (or tons) do I need?

To determine how many Tons you need (applies to 1-Man Rock sales only)

For 1-Man Rock, you must determine how many cubic feet of space you will need to fill with rock.  To figure out the number of cubic feet, just measure the length, width, and height (in feet) and multiply them together.  For example, if you have a wall that you want to put up that is 16 feet long by 2 feet wide and 2 feet tall you have 64 cubic feet of space to fill (16x2x2=64 cubic feet). 

1 ton of 1-Man Rock fills about 15 cubic feet of space, so if you have 64 cubic feet of space, divide it by 15 to find out approximately how many tons you will need.  64/15= 4.26 tons.  

To determine how many Yards you need 

All bulk material from Joe’s Landscaping Supplies (except for 1-Man Rock) is sold by the Cubic Yard.  Please round your answer to the nearest full yard.  We do sell 1/2 yard increments but generally, they are more expensive because they are harder to measure and a smaller quantity.  1 cubic yard is 3’x3’x3′ or 27 cubic feet. 

We strongly recommend clicking on, the cubic yard calculator we found and enter in your length, width and height.  It will automatically calculate the number of cubic yards for you.  This is the easiest!!    You can also just keep reading for information on how figure it out for yourself 

A good rule of thumb for most landscaping materials is to apply them about 3-4 inches deep but it doesn’t hurt to overestimate since when you buy topsoil, for example, you’ll likely compact it down if you are planting grass, walking on it, and/or it will naturally settle, making the 3″ depth that you figured be, in reality, more like 1.5″ or 2″ deep.

Please note that 1 yard of material (such as bark) covers 108 square feet (about a 10’x11′ area) 3″ deep and 81 square feet 4″ deep.  Again, if you are trying to figure out how much Topsoil or Fill Dirt to order, make sure to add up to 25% more than the calculations show if you are compacting it down.

You can figure out on your own how many yards you need for the space that you have.  Just measure the length, then measure the width and multiply the two together. This will give you the number of square feet that you want to cover with material.  For example, if you have a 4’x30′ area, 4×30=120 square feet.  Then divide the number of square feet by one of the following numbers (according to how deep or thick you want the material to be):

For 2″ deep, divide by 162

For 3″ deep, divide by 108

For 4″ deep, divide by 81

For 5″ deep, divide by 68

For 6″ deep, divide by 54

For 12″ deep, divide by 27

For 24″ deep, divide by 13.5

The answer to this equation should give you the number of yards that you need. Remember that Topsoil and Fill Dirt compacts down so you may consider adding up to 25% more to your calculation. 

Area Calculations

Draw your site as accurately as possible –  graph paper works well.  For odd or complex shapes, divide the area into combinations of rectangles, triangles, and/or circles.  Use the following formulas to determine area (and the number of square feet)

How to determine the area of a CIRCLE

Multiply pi ( = 3.14) by the square of the radius.  If you know the diameter (which is the distance across a circle), the radius is 1/2 of the diameter.  So if the diameter is 8 feet across, the radius is 4 feet.  If a circle has a radius of 4 feet, square it to get 16 feet.  Then multiply it by pi (3.14) as shown below. 

3.14×16’=50.24 square feet.  Then divide the number of square feet by: 

For 2″ deep, divide by 162

For 3″ deep, divide by 108

For 4″ deep, divide by 81

For 5″ deep, divide by 68

For 6″ deep, divide by 54

The answer to this equation should give you the number of yards that you need.

How to determine the area of a RECTANGLE or PARALLELOGRAM

Multiply the base times the height.
If a rectangle or parallelogram has a base of length 15 feet and a height of 10 feet,
its area is 15’x10’=150 square feet.  Then divide the number of square feet by:

For 2″ deep, divide by 162

For 3″ deep, divide by 108

For 4″ deep, divide by 81

For 5″ deep, divide by 68

For 6″ deep, divide by 54

The answer to this equation should give you the number of yards that you need.

How to determine the area of a TRIANGLE

Multiply the base times one-half the height.
If a triangle has a base of length 20 feet and a height of 12 feet,
its area is 20’x6’=120 square feet.  Then divide the number of square feet by:

For 2″ deep, divide by 162

For 3″ deep, divide by 108

For 4″ deep, divide by 81

For 5″ deep, divide by 68

For 6″ deep, divide by 54

The answer to this equation should give you the number of yards that you need.

How to determine the area of a TRAPEZOID

Add the lengths of the 2 parallel sides
divide by 2 to get the average length of the parallel sides.
Multiply this by the height (distance between the parallel sides) to get how many square feet.  Then divide the number of square feet by:

For 2″ deep, divide by 162

For 3″ deep, divide by 108

For 4″ deep, divide by 81

For 5″ deep, divide by 68

For 6″ deep, divide by 54

The answer to this equation should give you the number of yards that you need