View Full Version : converting square feet into tons for stone

11-07-2006, 02:06 PM
Looking for some help converting square feet of walkway for the amount of stone I need to put under it into tons.

11-07-2006, 02:56 PM
what, like 21a or 57s?

length x width x depth= cu. ft.

cu. ft. / 27= cu. yds.

cu. yds. x 1.8 tons per cubic yard= tons needed

11-07-2006, 05:49 PM
Yes Thanks Paper

11-07-2006, 05:55 PM
If you are doing a large job do not forget to multiply by a compaction/settlement factor. If it is a small job you should be okay with that formula.


11-07-2006, 07:03 PM
what, like 21a or 57s?

length x width x depth= cu. ft.

cu. ft. / 27= cu. yds.

cu. yds. x 1.8 tons per cubic yard= tons needed
we always used cu. yrds x 1.25 for tonage

11-07-2006, 07:09 PM
tons per cubic yards is different from material to material.1.8 is high so thats a good bet.

11-07-2006, 07:16 PM
I thought you multiplied square feet x .08 per inch of material needed and divided by 27 to get number of yards needed?

11-07-2006, 10:33 PM
same idea, cedar- i.e., for a 6" base you'd multiply times 0.5, etc...

Now the coolest thing in the world is a ProjectCalc calculator that'll do all the math for you. I keep one on my desk, one in my truck, and one with the laser transit.... just in case.

11-07-2006, 11:11 PM
call your stone supplier, they usually refer to stone in tons and they have the conversions there

11-08-2006, 07:07 AM
depends on how they load it.
if they weigh you then they sell by tons, if they just use a loader they sell per yard.

11-08-2006, 01:05 PM
Generally speaking:

For loose stone (drainage, river rock, etc.) we use 1.5 tons per cubic yard.

For QP we use 1.8 tons per cubic yard.

As said above your stone supplier (if they sell by weight) will provide the amount you need if you supply them with the square footage and depth of desired stone.

Of course if you get loaded by a front end loader and you know its a two yard bucket and onoly need one yard just tell him half a bucket. Has been working well for us over the years.

Matt k
11-24-2006, 09:11 PM
This is from ICPI, we use it all the time and it is right on for compacted base material.

Square feet divided by 175, multiply by depth in inches, multiply by 1.1= tons needed.

Example: 800 square foot patio at 6" for pedestrian use

800 divided by 175= 4.6, 4.6 x 6 (")= 27.4, 27.4 x 1.1= 30 ton of compacted material

***This helps with setting bed estimating as well, not as close as base material, but helpfull. When using it for concrete sand, the amount comes out a little heavy.