Gravel Calculator

Calculating gravel requires moving sequentially through geometry and material density formulas. First, if you provide separate length and width inputs, the calculator determines the total surface area by multiplying length by width (Area = Length * Width). Next, multiplying this area by your desired layer depth yields the exact volume needed (Volume = Area * Depth). Because aggregates are typically sold by weight, the calculator then applies the specific density of your chosen gravel type (such as crushed stone, pea gravel, or river rock) using the formula Weight = Volume * Density. Finally, multiplying the total volume or weight by your local supplier's unit pricing provides an accurate total material cost.

Imagine you want to lay a fresh gravel driveway that measures 20 feet long by 10 feet wide, and you need a standard depth of 3 inches (0.25 feet). First, find the surface area: 20 ft * 10 ft = 200 sq ft. Second, calculate the cubic volume by multiplying the area by the depth: 200 sq ft * 0.25 ft = 50 cubic feet. To convert this into cubic yards, divide by 27, giving approximately 1.85 cubic yards. Assuming a standard gravel density of 2,600 pounds per cubic yard, you will need roughly 4,810 pounds, or 2.41 tons, of material. If local crushed stone costs $35 per ton, your total material cost will be 2.41 tons * $35 = $84.35.

Always order 5 to 10 percent extra gravel to account for settling, compaction, and uneven subgrade depths. Measure your project area in multiple spots to ensure your length and width dimensions are completely accurate before plugging them into the calculator. Keep in mind that different aggregate types have unique densities; lightweight materials like expanded shale require different tonnage calculations compared to heavy dense-grade limestone.