1 (A cubic yard of gravel is 3'x3'x3' and weighs roughly 1.2 to 1.7 tons or more). 2  A 12'x25' single-car driveway 9 thick requires an estimated 10-14 tons, which can cost $100 -$850. 3  A 14'x100' driveway 6 thick requires about 26 tons of gravel, or $260 -$1,560 for just the stones.