The weight of crushed rock will vary greatly depending on the type of the stone and the size and uniformity of the crush. The smaller the crush size, the heavier the load.
Solid rock is estimated at 2.5 to 3 tonnes per cubic metre. If rock is crushed into uniform sizes, the presence of open space between the particles causes the load to be lighter -- approximately 1.6 tonnes per cubic meter. Mixed sizes of crushed rock can range from 1.6 to 2.2 tonnes per cubic meter.
Sands & Chips
Weighing in at .92 tonnes are masonry sand, building sand, and stone chips or flakes. These are some of the lightest materials. The next level, at just under one tonne, are concrete sand and airfield sand.
Natural rocks, 12 to 24 inches, which are commonly used in landscaping, are approximately 1.18 tonnes per cubic meter. Two-inch to 12-inch oversized rocks are approximately 1.25 tonnes.
Gravel & Aggregates
Crushed aggregate, one-inch crushed concrete, recycled asphalt, 3/8-inch pea gravel, 2-inch sewer filter rock, and concrete and asphalt aggregate blends all weigh in at 1.07 tonnes. Pit run gravel follows at 1.25 tons per cubic meter, regardless of whether it is 2-inch or 4-inch. The heaviest of the crushed rock selections are Angular Rip Rap and white granite, weighing in at 1.34 tonnes per cubic meter.