How do I calculate decomposed granite?

Multiply length by width to get square feet, multiply by decomposed granite depth in feet to get cubic feet, divide by 27 for cubic yards, then add a compaction or waste allowance. Convert cubic yards to tons using the material density from your supplier.

How deep should decomposed granite be for a path?

Many pedestrian paths use about 2 to 3 inches of compacted decomposed granite over a prepared base. Driveways, poor soil, or heavy-use areas may need a thicker base and local installation guidance.

How many tons are in a cubic yard of decomposed granite?

Decomposed granite commonly weighs about 1.3 to 1.5 tons per cubic yard, depending on moisture, gradation, and compaction. Use your supplier's density when ordering.

Landscape material calculator

Decomposed Granite Calculator

Estimate decomposed granite cubic yards, tons, bags, and material cost for a path, patio, side yard, seating area, or landscape bed.

DG needed 1.15 tons A 20 ft × 4 ft area at 3 in deep with 15% compaction/waste.

How to use this decomposed granite calculator

Enter the length, width, and finished depth for the area you want to cover. The calculator converts the volume into cubic yards, adds a compaction and waste allowance, and estimates tons from the density you choose.

For walkways and patios, decomposed granite is often installed in compacted lifts rather than dumped at full depth in one pass. If your supplier gives coverage per ton or per cubic yard, use that local number for your final order.

Decomposed granite planning tips

Add a compaction allowance. DG settles when watered and compacted, so 10–20% extra is common for small landscape projects.
Separate finished depth from base prep. A 2–3 inch DG surface may still need excavation, edging, weed fabric, or a compacted base layer.
Confirm the product type. Stabilized DG, loose DG, fines, and crushed granite screenings can quote different densities and prices.
Round up practical orders. Bulk suppliers may have delivery minimums; bagged DG is usually better only for tiny patches.

FAQ

What is the formula for decomposed granite coverage?

Use length × width × depth in feet to get cubic feet. Divide by 27 for cubic yards, add compaction or waste, then multiply by tons per cubic yard if you are ordering by weight.

How much does one yard of decomposed granite cover?

One cubic yard covers about 162 square feet at 2 inches deep, 108 square feet at 3 inches deep, or 81 square feet at 4 inches deep before compaction allowance.

Should I buy decomposed granite by the bag or by bulk delivery?

Bulk delivery is usually cheaper for paths, patios, and larger beds. Bags can make sense for repairs, small corners, and projects where delivery access is difficult.