The average weight of a sandstone boulder is
approximately 150 pounds per cubic foot. Limestone
boulders and granite boulders in most cases weigh
more. They average about 175 pounds per cubic foot.
To estimate the quantity, you need to convert the
area into cubic feet by multiplying length x width x
height. Once you have this number, multiply it by
the boulder's weight per cubic foot, then divide by
2000 to convert this number into tons.
