Question

About how much does one yard (27 cubic feet, or 0.76 cubic meters) of loose rock weigh? About how much does one yard of the same type of rock weigh when compacted?

Answer

One yard (27 cubic feet, or 0.76 cubic meters) of loose rock weighs about 1.35 tons (1.22 metric tons). One yard of the same type of rock compacted, weighs about 1.9 tons (1.72 metric tons). Different types and sizes of rock will vary from this, but for the type and size usually used for bearing surfaces under buildings, the above holds true.