How Much Area Will a Ton of Gravel Cover? One ton of gravel covers 100 square feet at 2 inches thick, 80 square feet at 3 inches thick, 70 square feet at 4 inches thick or 60 square feet at 5 inches thick. ... How Do I Calculate How Much Gravel I Need? How Many Cubic Feet Are in a 53Foot Trailer? How Do You Calculate Population Density?