How to calculate decomposed granite
Example: a 4 ft × 40 ft path at 3 inches is 160 × 3 ÷ 12 = 40 cubic feet = 1.48 cubic yards. With 15% extra for compaction that's about 1.7 yards — roughly 2.4 tons.
How deep should DG be?
| Use | Compacted depth |
|---|---|
| Mulch-style ground cover around plants | 2 in |
| Garden paths and walkways | 3 in |
| Patios and seating areas | 3–4 in |
| Light-traffic driveways (over a stone base) | 4–6 in |
Why add extra?
DG is spread loose, then wetted and compacted in 1–2 inch layers, which reduces its volume noticeably. The calculator adds 15% by default. Stabilized DG (with a binder) gives a firmer, less dusty surface for patios.
Frequently asked questions
How much does a cubic yard of decomposed granite weigh?
Roughly 2,600–3,000 lb (about 1.4 tons), depending on moisture.
How much area does a ton of DG cover?
About 75 sq ft at 3 inches deep, or 115 sq ft at 2 inches (before compaction).
Do I need a base under decomposed granite?
For paths, compacted native soil plus landscape fabric is often enough. For patios and driveways, use 3–4 inches of compacted crushed stone first.
What is stabilized decomposed granite?
DG mixed with a binder that hardens after watering and compaction, making a firmer surface that resists erosion.
Related calculators
These figures are estimates for planning only. Material weights and coverage vary by supplier, moisture and compaction. Always confirm quantities and prices with your supplier before ordering. See our terms & disclaimer.