Decomposed Granite Calculator 2026 – Quantity Estimator
Calculate the exact amount of decomposed granite needed for your pathway, patio, or driveway project. Get instant estimates for cubic yards, tons, and total material cost based on your project dimensions and DG type.
Decomposed Granite Quick Facts 2026
Weight Per Yard
Average pounds per cubic yard (1.4 tons) for standard decomposed granite
Average Cost
Per ton for natural DG in USA (2026) - stabilized DG costs $100-$185/ton
Standard Depth
Recommended compacted depth for pathways and patios (3-4" for driveways)
Coverage Rate
Per ton at 3" depth after compaction (account for 20-30% compression)
Who Can Use This Calculator?
DIY Homeowners
Plan your backyard pathway or patio project with accurate material estimates and avoid over-ordering expensive DG.
Landscape Contractors
Provide precise quotes for DG installations with instant calculations for multiple project shapes and depths.
Landscape Designers
Estimate material quantities during design phase for xeriscaping, desert landscapes, and modern pathway projects.
Material Suppliers
Help customers calculate their DG needs quickly and accurately to reduce returns and improve customer satisfaction.
🧮 Calculate Your Decomposed Granite Needs
How the Decomposed Granite Calculator Works
Select Shape
Choose rectangle or circle shape matching your project area. The calculator adjusts measurements accordingly.
Enter Dimensions
Input your project length, width (or diameter), and desired depth in feet and inches.
Choose DG Type
Select natural, stabilized, or resin-coated DG. Add compaction factor and cost estimates if needed.
Get Results
Instantly see cubic yards, tons needed, cost breakdown, and coverage details with downloadable PDF report.
Complete Guide to Decomposed Granite Calculations
Decomposed granite (DG) is weathered granite rock broken down into sand-sized particles with fine dust. Popular for pathways, patios, and xeriscaping, DG creates a natural, permeable surface that compacts firmly while allowing water drainage. Accurate calculation prevents material waste and project delays.
This decomposed granite calculator uses your project dimensions, DG type, and compaction factor to determine exact material quantities in cubic yards and tons. The tool accounts for the 20-30% volume loss during compaction, ensuring you order enough material for proper installation depth.
Understanding DG Weight and Density
One cubic yard of decomposed granite weighs 2,600 to 3,000 pounds depending on moisture content and particle size. Dry DG averages 2,600 lbs per cubic yard (1.3 tons), while moist material reaches 3,000 lbs (1.5 tons). Most suppliers calculate delivery by weight in tons rather than volume.
The standard conversion rate is 1.4 tons per cubic yard for ordering purposes. This accounts for typical moisture content and particle packing density. When calculating coverage, one ton covers approximately 100 square feet at 3 inches compacted depth or 150 square feet at 2 inches depth.
DG Types and Applications
| DG Type | Cost Per Ton (2026) | Best Use | Compaction |
|---|---|---|---|
| Natural DG | $40-$80 | Garden paths, tree rings, low-traffic areas | Moderate |
| Stabilized DG | $100-$185 | Walkways, patios, residential driveways | Excellent |
| Resin-Coated DG | $150-$225 | Commercial driveways, parking areas, heavy traffic | Superior |
Natural DG contains no additives and works well for low-traffic landscape areas. It requires periodic topdressing every 2-3 years. Stabilized DG includes polymer or resin binders mixed on-site that harden the surface, reducing erosion and migration. Resin-coated DG arrives pre-mixed with epoxy resin for the most durable, permanent installation. Learn more about material selection in our material calculators section.
Proper Installation Depths
Standard pathway and patio installations require 2 to 3 inches of compacted decomposed granite over a 4-inch compacted base rock layer. Since DG compresses 20-30% during compaction, apply 3 to 4 inches of loose material to achieve 2.5 to 3 inches compacted. Driveways need 3 to 4 inches compacted (4 to 5 inches loose) for adequate load-bearing capacity.
Apply DG in multiple thin layers rather than one thick layer. Spread 1/2 to 1 inch of loose material, spray lightly with water, then compact thoroughly with a plate compactor. Repeat until you reach the desired final depth. This layered approach prevents uneven compaction and surface cracking. For concrete patio alternatives, see our concrete patio calculator.
💡 Pro Tip: Compaction is Critical
Rent a plate compactor ($60-$100/day) for any DG project over 50 square feet. Hand tamping works for small areas but cannot achieve the 95% compaction rate needed for stable surfaces. Make at least 3 passes with the compactor over each layer, overlapping each pass by 6 inches.
Base Rock Requirements
Every DG installation requires a compacted aggregate base for stability and drainage. Excavate 6 to 8 inches total depth, install landscape fabric to prevent weed growth, then add 4 inches of 3/4-inch crushed rock (Class II road base). Compact the base to 95% density before adding DG layers.
The base rock prevents DG from mixing with soil, maintains proper drainage, and provides load-bearing support. Budget $35 to $50 per ton for base rock material. One ton of base rock covers approximately 80 square feet at 4 inches compacted depth. Calculate base rock separately from DG quantities. For foundation work requiring aggregate, check our concrete aggregate calculator.
⚠️ Important: Avoid Common Installation Mistakes
Never install DG directly over grass or soil. Always remove all organic material and install base rock first. Don't apply DG too thick in one layer - it won't compact properly and will remain loose. Skip the landscape fabric only if you want weed growth. Wet the DG lightly before compacting, but don't oversaturate or it won't compact.
Cost Considerations for 2026
Decomposed granite material costs range from $40 to $225 per ton depending on type and location. Add $50 to $150 for delivery within 25 miles, with costs increasing $2 to $5 per mile beyond that range. Minimum delivery orders typically require 3 to 5 tons. For smaller projects under 1 ton, purchase bagged DG at landscape supply stores for $8 to $15 per 0.5 cubic foot bag.
Professional installation averages $4 to $8 per square foot including excavation, base rock, DG material, and labor. DIY installation saves 60-70% on costs but requires equipment rental and physical labor. Budget for plate compactor rental ($60-$100/day), wheelbarrow if needed ($40-$80), and hand tools like rakes and shovels. Compare installation costs with alternatives using our paver calculator or asphalt driveway calculator.
Real Decomposed Granite Project Examples
🚶 Garden Pathway
Dimensions: 30 ft × 4 ft × 3 in deep
Area: 120 square feet
DG Type: Natural
Materials: 1.5 cubic yards | 2.1 tons DG
Cost Estimate: $125-$170 (material + delivery)
Perfect for low-traffic garden paths. Requires 0.5 tons base rock ($20-$25). Total project cost DIY: $145-$195. Professional install: $480-$960.
🏡 Backyard Patio
Dimensions: 16 ft × 12 ft × 3 in deep
Area: 192 square feet
DG Type: Stabilized
Materials: 2.4 cubic yards | 3.4 tons DG
Cost Estimate: $340-$630 (material + delivery)
Stabilized DG provides firm surface for patio furniture. Needs 1.9 tons base rock ($65-$95). DIY cost: $480-$800. Professional: $770-$1,540. Compare with concrete patio costs.
🚗 Residential Driveway
Dimensions: 40 ft × 12 ft × 4 in deep
Area: 480 square feet
DG Type: Resin-Coated
Materials: 7.4 cubic yards | 10.4 tons DG
Cost Estimate: $1,560-$2,340 (material + delivery)
Resin-coated DG supports vehicle traffic. Requires 3.6 tons base rock ($125-$180). DIY: $1,800-$2,700. Professional: $2,400-$3,840. See concrete driveway comparison.
Decomposed Granite Calculator FAQs
How deep should decomposed granite be for a pathway?
For pathways and patios, install 2 to 3 inches of compacted decomposed granite. High-traffic areas like driveways require 3 to 4 inches after compaction. Always add a 4-inch compacted base layer beneath the DG for stability and drainage.
Apply loose DG at 3 to 4 inches depth before compaction to achieve 2.5 to 3 inches final compacted depth. DG compresses 20-30% during proper compaction with a plate compactor.
How much does a yard of decomposed granite weigh?
A cubic yard of decomposed granite weighs approximately 2,600 to 3,000 pounds (1.3 to 1.5 tons) depending on moisture content. Dry DG weighs around 2,600 lbs per cubic yard, while moist material reaches 3,000 lbs per cubic yard.
Most suppliers use 2,800 lbs (1.4 tons) per cubic yard as the standard conversion rate for ordering. Always confirm weight specifications with your supplier before ordering truck loads.
How many square feet does a ton of decomposed granite cover?
One ton of decomposed granite covers approximately 100 square feet at 3 inches deep after compaction. At 2 inches depth, one ton covers roughly 150 square feet. Coverage varies based on compaction rate and moisture content.
The formula is: Coverage (sq ft) = (Tons × 2000 lbs) ÷ (Depth in inches ÷ 12 × 2800 lbs/cu yd ÷ 27). This calculator performs these conversions automatically for accurate estimates.
What is the difference between natural and stabilized decomposed granite?
Natural DG is pure weathered granite without additives, costing $40-$80 per ton. It works well for low-traffic garden areas but requires topdressing every 2-3 years as material migrates and erodes.
Stabilized DG contains resin or polymer binders that harden the surface, preventing erosion and migration. Stabilized DG costs $100-$185 per ton and works best for high-traffic walkways, patios, and residential driveways. It lasts 7-10 years with minimal maintenance.
Does decomposed granite need to be compacted?
Yes, compacting decomposed granite is essential for a stable, durable surface. Apply DG in 1/2-inch layers and compact each layer with a plate compactor. Proper compaction reduces material by 20-30% and prevents erosion, rutting, and migration.
Make at least 3 passes with the compactor over each layer, lightly misting with water before compacting. Achieve 95% compaction for walkways and 98% for driveways. Uncompacted DG remains loose, dusty, and washes away easily.
How much does decomposed granite cost in 2026?
Natural decomposed granite costs $40 to $80 per ton in 2026. Stabilized DG ranges from $100 to $185 per ton, while resin-coated DG costs $150 to $225 per ton. Add $50-$150 for delivery depending on distance and quantity ordered.
Professional installation averages $4 to $8 per square foot total including excavation, base rock, DG material, compaction, and labor. DIY projects save 60-70% but require equipment rental and physical labor. Base rock adds $35-$50 per ton to total material costs.
Can I install decomposed granite over grass?
No, remove all grass, weeds, and organic material before installing DG. Excavate 6-8 inches total depth, install landscape fabric, add 4 inches of compacted base rock, then add 2-3 inches of compacted decomposed granite on top.
Installing DG over grass causes weed growth through the surface, uneven settling, poor drainage, and rapid deterioration. Proper excavation and base preparation ensures a stable, long-lasting DG surface. For soil and dirt removal calculations, use our dirt calculator.
How long does decomposed granite last?
Natural decomposed granite lasts 3 to 5 years before requiring a top layer refresh. Stabilized DG lasts 7 to 10 years with minimal maintenance. Resin-coated DG can last 10+ years. Longevity depends on traffic, climate, and proper installation with base layers.
Maintain DG surfaces by raking smooth monthly, adding 1/4 to 1/2 inch topdressing annually, and keeping edges contained with steel edging or concrete borders. High-traffic areas wear faster and need more frequent topdressing. For permanent surfaces, explore concrete calculator options.
Data Sources and Accuracy
- Material Density: National Stone, Sand & Gravel Association (NSSGA) - 2,600-3,000 lbs/cu yd standard
- Coverage Rates: Landscape Industry Standards - 100 sq ft per ton at 3" depth
- Material Costs: HomeAdvisor & HomeGuide 2026 pricing data - USA regional averages
- Installation Standards: American Society of Landscape Architects (ASLA) best practices
- Compaction Rates: Engineering ToolBox material specifications - 15-30% volume reduction
Last Updated: January 2026 | Accuracy: ±5% for standard DG projects
Disclaimer: Estimates are for planning purposes only. Actual material quantities and costs vary based on site conditions, DG source, moisture content, compaction method, and regional pricing. Always verify measurements on-site and confirm pricing with local suppliers before ordering. This calculator does not replace professional landscape design or engineering for structural applications.
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