15 cubic feet of what? - Different substances have different densities. There is no general conversion between volume and mass (or volume and weight).
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Knowing that 1 cubic foot is pretty much equal to 100 pounds or 0.05 ton, 1 ton of gravel is around 20 cubic feet.
a cubic ton
Without knowing the density of the material it is not possible.The question has no meaning. A ton is a measure of mass, cubic feet is a measure of volume. It makes as much sense as asking how heavy one hour is.
1 ton, but I don't know whether that's a short ton or a long ton. A cubic ton is a measurement of volume (i.e. how much space it takes up). A cubic ton of sand is how much space a ton of sand takes up. A cubic ton of timber is how much space a ton of timber takes up, and as timber is lighter than sand, a cubic ton of timber is larger than a cubic ton of sand, even though they both weigh the same. As for the volume of a cubic ton of sand, I have no idea. You could get a rough answer this way: "m" divided by "d" where m =one ton in whatever units you are using (e.g. kg) and d = density of sand (in the same units)
Different types of stone have different densities and therefore different weights per cubic foot, rendering this question unanswerable unless you know the weight of the stone per cubic unit.