View Full Version : Calculating dirt needed using sq footage and required depth?

Green Pastures
04-11-2007, 01:04 PM
There used to be a sticky with a link to a free site that would allow you to calculate the dirt (mulch, stone, whatever) needed (in cubic yards and ot tonnage) to fill a space using the known square footage and depth you wanted to fill.

I can't find it on this site.

I did several searches so don't be a smartalec please.


04-11-2007, 01:14 PM

1 Cubic yard 1 inch deep will cover 324 Square feet
1 Cubic yard 2 inch deep will cover 162 Square feet
1 Cubic yard 3 inch deep will cover 108 Square feet
1 Cubic yard 4 inch deep will cover 81 Square feet
1 Cubic yard 5 inch deep will cover 64 Square feet
1 Cubic yard 6 inch deep will cover 54 Square feet

(Length in Feet)( Width in Feet)*(Depth in Feet)=cubic feet
Example: Say you have an area that is 12' x 18 '. You want to cover it with 6" of material.
Multiply, 12' x 18' x *.5' to get 108 cubic feet. You see, 6" is .5 feet or 1/2 a foot.
Now, devide 108 cubic feet by 27 cubic feet(1 yard) to get your total yardage at 4 yards.

If you want a 3" cover you use 1/4' or .25'. A four inch cover is 1/3 foot or .33', etc.

04-11-2007, 01:14 PM
length (feet) x width (feet) x depth (feet) / 27 = yardage x 1.2 for compaction

Green Pastures
04-11-2007, 01:24 PM
Thanks....found the "free tools" tab at the top of the page.....;)

04-12-2007, 12:35 PM
I have been in this business for twenty-six years and have always used the following formula with good results.
Multiply your square footage by .003 for 1" coverage
.0061 for a 2" coverage .0092 for a 3" coverage and
.0123 for a 4" coverage. It takes 12.3 cubic yards of top soil to cover 1,000 square feet at 4". Hope this helps.

04-12-2007, 12:37 PM
areamulchandsoil dot com is what i use