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Old 05-13-2014, 11:20 AM
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XC skier XC skier is offline
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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?
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Old 05-13-2014, 11:25 AM
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CuttingEdge LawnCare CuttingEdge LawnCare is offline
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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
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Old 06-07-2014, 06:12 PM
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http://fredburrows.com/calculator/calc.html
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Old 06-10-2014, 12:12 PM
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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
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Old 06-10-2014, 12:36 PM
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I received this answer several years ago when I had the same question as you.

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.
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Old 06-11-2014, 12:18 PM
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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.
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Old 06-11-2014, 02:28 PM
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You mean that the calculator that I posted a link to isn't close enough for you guys?
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Old 06-11-2014, 10:48 PM
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Here is what I use.

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