How to Resurface a Gravel Driveway | eHow
For example, to calculate the volume of gravel needed to resurface a driveway that's 15 feet long and 6 feet wide to a depth of 3 inches, first multiply 15 by 6 to get the total area of 90 square feet. Divide 3 inches by 12 to get 0.25. Multiply 90 by 0.25 to get 22.5 cubic feet of gravel…