One ton of gravel is approximately 18 cubic feet. One and a half tons of gravel equals 1 cubic yard, which is approximately 27 cubic feet. One ton of gravel covers an estimated 80 to 100 square feet when poured 2 inches deep.
A cubic yard is 3 feet long, 3 feet wide and 3 feet high. Loose gravel is typically sold by the cubic foot, but knowing how the square feet of the area to be covered helps determine how many tons are needed. To get an estimate of how many tons of gravel are needed, square footage is determined by multiplying the length of the area by the width of the area and then multiplying that by 100.