How much landscaping rock do I need? | MDI Rock
L × W = Square footage of coverage area. Square feet of coverage area ÷ coverage area per 1 ton = tons of rock needed. Using this formula, you can see that if you're looking to cover 360 square feet with 1"-3" size rocks, you're probably going to need 4.5 tons. If you're using smaller materials, say 3/4"-1", you may need only 3 ...