Decomposed Granite Calculator
Estimate decomposed granite for pathways, patios and xeriscape ground cover by area and depth. Plan on about 3 inches for a walkable surface.
Decomposed Granite calculator
How it's calculated: Length ft × width ft × (depth in ÷ 12) = cubic feet; add 5% waste and divide by 27 for cubic yards, then multiply by 1.5 tons per cubic yard.
How to estimate decomposed granite
- Compact DG in 1.5-2 inch lifts; stabilized DG with a binder holds together better on slopes.
- Crown or slope the surface slightly so water runs off rather than pooling.
- DG weighs roughly 1.4-1.5 tons per cubic yard.
- Contain DG paths with steel or timber edging - loose fines scatter and wash without a border.
- Plan to top up high-traffic DG every few years; it sheds fines with use and rain.
Frequently asked questions
How thick should decomposed granite be?
About 3 inches compacted for a path or patio. Use stabilized DG for high-traffic or sloped areas.
What is stabilized decomposed granite?
DG blended with a binder that activates when watered and compacted, giving a firmer surface that sheds less grit. It costs more per ton but holds up far better on slopes and busy paths.
How many tons of DG for a path?
Figure about 3 tons per 50 feet of 4-ft-wide path at 3 inches deep, and scale from there - the math is length x width x depth.
Does DG get muddy in the rain?
Loose DG softens when soaked and tracks grit indoors. Proper compaction, a slight crown so water runs off, and a stabilizer binder all keep it firm in wet weather.
Is decomposed granite OK for a driveway?
Light vehicle use can work with stabilized DG over a solid compacted base, but regular traffic ruts it. For a daily-use driveway, crushed stone holds up better.