# help with calculation

Discussion in 'Landscape Architecture and Design' started by FIREMAN Q, May 31, 2008.

1. ### FIREMAN QLawnSite Senior Memberfrom New London County, CTPosts: 260

I am working on an estimate for leveling off a backyard and need some help.

The area is 135w x 90L and it will need to be brought up about 18" over the 90' at the end of the grade. I was also planning on putting 3-4" of topsoil on top of the fill. I just can't seem to figure out a firm number for the fill. Any help would be great. thanks

2. ### Summit L & DLawnSite Senior Memberfrom South TexasPosts: 269

length x width x depth (in inches) / 324 = total cubic yards

Now how much do you need to charge to put it down? You have to answer this question by knowing how much it cost you to do business and what type of work you want to represent.

Hope this helps.

3. ### FIREMAN QLawnSite Senior Memberfrom New London County, CTPosts: 260

thank you. I am hung up on this because of the taper. I visualize it as a triangle of sorts. Starting at 1" and ending up at 18". Its not going to be
18" through out the entire length. Is this going to change the cubic feet?

4. ### AI IncLawnSite Fanaticfrom Southern NHPosts: 25,593

yes , go with 60% of total from prior amount.

5. ### IsobelLawnSite Senior Memberfrom West of BostonPosts: 548

approximately 340 cubic feet is what I came up with, just for fill.

((1.5' x 90')/2 [that's your triangle]) * 135' = cubic feet

cubic feet/27 = cubic yds

6. ### FIREMAN QLawnSite Senior Memberfrom New London County, CTPosts: 260

thanks for the help

7. ### JNyzLawnSite Bronze Memberfrom Conshohocken, PAPosts: 1,086

Don't forget the compaction factor.

8. ### FIREMAN QLawnSite Senior Memberfrom New London County, CTPosts: 260

what should I expect for compaction?

9. ### FIREMAN QLawnSite Senior Memberfrom New London County, CTPosts: 260

is that 340 yards?

yes.
sorry.