#1
05-13-2014, 11:20 AM
 XC skier LawnSite Member Join Date: Apr 2009 Location: Poughkeepsie, NY Posts: 204
Stone Calculator?

Mulch, sand, stone dust, item 4 and concrete quantities are pretty easy to calculate but, what about stones? Say a customer wants to replace their mulched beds with decorative stone. If we're talking about the small white or red ones it's virtually the same as mulch but, if they want to use 3" river rock then things change because just one rock is greater than the depth that we would usually mulch and you would be able to see the fabric through the gaps. What formula would you use to determine how many yards of 1.5", 2" or 3" stone you would need per square foot.

Part 2: Does stone size affect production rates? I use the figure of 1.25 yds per man hour for mulch and 1 yd per man hour for the 1/4" stone so I would guestimate that as the stone size increases the production rate decreases- does it?
#2
05-13-2014, 11:25 AM
 AMW Landscaping LawnSite Senior Member Join Date: Apr 2013 Location: Cincinnati Ohio Posts: 621
Not sure on part one. Part two is yes. The weight of the stone will change because a yard of small and a yard of big rocks do not weigh the same. The smaller are also easer to handle and spread
#3
06-07-2014, 06:12 PM
 1idejim LawnSite Fanatic Join Date: Jul 2009 Location: State of Jefferson Posts: 7,205
http://fredburrows.com/calculator/calc.html
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#4
06-10-2014, 12:12 PM
 BlockHead23 LawnSite Member Join Date: Mar 2013 Location: Belleville, IL Posts: 38
We figure you get roughly about 80 square feet per ton of 3/4" -1.5" gravel. And 70 square foot per ton for 2.5"-3+" gravel
#5
06-10-2014, 12:36 PM
 ron mexico75 LawnSite Bronze Member Join Date: May 2009 Posts: 1,477

you can buy rock by the ton. They will tell you how much area it will cover. 1 ton of 1-2" river rock covers about 90sqft. So what you need to do is measure where its going... say 10'x4' = 40sqft divide by 90 is .44. So about 1/2 ton.
#6
06-11-2014, 12:18 PM
 XC skier LawnSite Member Join Date: Apr 2009 Location: Poughkeepsie, NY Posts: 204
Ok, but that is still kind of general. For a small area like 90 sf the difference is negligible; however, if we're talking 2,000 sf then you would certainly want a more exact formula. There is a big difference between 1" and 2" stone and what if you're using 3"? The gaps between each stone increase requiring more to achieve complete coverage, so you need 4" depth with 2" stone or 6" depth with 3" stone. Not only does the material usage go up but, also the trucking and especially the labor.
#7
06-11-2014, 02:28 PM
 1idejim LawnSite Fanatic Join Date: Jul 2009 Location: State of Jefferson Posts: 7,205
You mean that the calculator that I posted a link to isn't close enough for you guys?
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#8
06-11-2014, 10:48 PM
 Johnagain LawnSite Senior Member Join Date: Oct 2008 Location: Altoona, Florida Posts: 372
Here is what I use.

http://www.pebblejunction.com/gravel...calculator.cfm

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