Decomposed Granite Calculator - Calculate DG Yards, Tons, Bags, and Material Costs

The decomposed granite calculator determines the exact cubic yards, weight in tons, and 50-pound retail bags of decomposed granite needed for pathways, patios, and landscaping beds. By factoring in length, width, depth, and material compaction settling, the calculator helps you order the correct volume without underestimating or overpaying.

• • Garden Paths and Walkways: Calculate aggregate needs for 2-inch to 3-inch deep garden trails and residential walkways with proper compaction allowance.
• • Outdoor Patios and Fire Pits: Size decomposed granite base and surface layers for rustic seating areas, pergolas, and outdoor fire pit surrounds.
• • Bocce Courts and Dog Runs: Estimate screened, stabilized DG for level gaming surfaces, pet relief runs, and permeable drought-tolerant groundcover.
• • Driveways and Parking Pads: Calculate heavy-duty 4-inch to 6-inch deep reinforced driveway installations requiring high compaction and stabilizer binders.

Decomposed granite (commonly abbreviated as DG) consists of naturally weathered granite rock fragments ranging from 3/8-inch gravel fines down to fine stone dust. It provides an earth-toned, permeable, and organic alternative to poured concrete or asphalt, forming a firm yet natural surface when watered and rolled.

Because decomposed granite compacts by 10% to 20% when rolled with a plate compactor or lawn roller, calculating purely geometric cubic yards leads to material shortages. This calculator builds in standard compaction factors so your bulk delivery or bagged pickup covers the entire project depth cleanly.

When planning heavier vehicle driveways using crushed stone or dense grade aggregate, the Gravel Driveway Calculator provides tailored tonnage and multi-layer base calculations.

The decomposed granite calculator uses standard geometric volume equations, aggregate compaction ratios, and verified bulk material density factors to convert site dimensions into cubic yards, short tons, and retail bags.

• Length & Width (ft): The linear measurements of the installation footprint in feet.
• Depth (in): The target compacted layer thickness in inches (typically 2 to 4 inches).
• Compaction Factor (%): Percentage added (standard 15%) to account for mechanical tamping, particle interlocking, and settling.
• Bulk Density (1.4 tons/yd³): The engineering average mass per unit volume for loose-to-compacted decomposed granite aggregate with fines.

Decomposed granite contains a wide distribution of particle sizes ranging from coarse stone chips down to microscopic rock flour. When compacted and dampened, the small fines migrate into the voids between larger particles, shrinking the initial loose bulk volume while increasing structural density.

Bulk landscape suppliers sell decomposed granite by the ton or by the cubic yard. Knowing both units allows you to compare quotes from quarries that weigh dump trucks on a certified scale against yards that load materials by front-end loader bucket.

According to National Stone, Sand & Gravel Association (NSSGA), Sand & Gravel Association (NSSGA), graded aggregates with fines such as decomposed granite pack to a compacted density of 1.4 to 1.5 tons per cubic yard (2,800 to 3,000 lbs/yd³).

For decorative borders, dry creek beds, and larger river rock coverage alongside your DG pathway, the Landscape Rock Calculator estimates rock tons across varying stone sizes.

Understanding material grades, stabilization methods, and thickness standards ensures a durable hardscape installation.

Selecting the proper grade of decomposed granite depends directly on intended foot and vehicle traffic. High-traffic walkways, outdoor dining patios, and wheelchair-accessible ramps benefit heavily from stabilized decomposed granite to prevent shoes from sinking.

Edge restraints such as steel landscape edging, bender board, or concrete borders are essential for maintaining lateral containment and preventing the compacted edges from crumbling under perimeter pressure.

If you decide to combine decomposed granite with interlocking patio stones or flagstone steppers, the Paver Calculator calculates block quantities, bedding sand, and sub-base gravel.

Follow these simple steps to calculate your decomposed granite aggregate needs accurately in under a minute.

1. 1 Measure Project Dimensions: Measure the length and width of your rectangular patio or pathway in feet. For irregular shapes, calculate the total square footage.
2. 2 Select Target Layer Depth: Enter the planned depth in inches: 2 inches for light garden trails, 3 inches for pedestrian patios, and 4 to 6 inches for vehicle driveways.
3. 3 Set Compaction Percentage: Leave the standard 15% compaction buffer, or increase to 20% for deep driveway sub-bases requiring heavy multi-pass plate rolling.
4. 4 Enter Local Price per Ton: Optionally input your local bulk quarry price per ton (typically $40 to $80/ton) to get a total material cost estimate.
5. 5 Review Yards, Tons, and Bag Tallies: Read the compacted cubic yards for bulk deliveries, total short tons for quarry scale orders, and 50-lb bag counts for retail bags.

For a 50 ft by 4 ft garden pathway (200 sq ft) built at a 2-inch depth with a 10% compaction allowance and $65/ton material price, the calculator indicates 1.36 cubic yards (1.90 tons) or 76 retail 50-lb bags, totaling $123.50 in aggregate.

To coordinate surrounding garden bed coverage and organic groundcover volume, the Mulch Calculator calculates wood chips and bark mulch in cubic yards and retail bags.

Decomposed granite offers distinct functional and aesthetic advantages over traditional concrete, flagstone, and pavers.

• • High Natural Permeability: Allows rainwater to infiltrate directly into the underlying soil, reducing stormwater runoff, preventing pooling, and nourishing tree roots.
• • Cost-Effective Hardscaping: Costs roughly one-third the price of poured concrete and one-fifth the cost of natural flagstone or custom interlocking pavers.
• • Warm Earth-Toned Aesthetics: Blends naturally into arid, modern, Mediterranean, and cottage garden landscapes with tan, gold, gray, and reddish hues.
• • Simple DIY Installation: Requires no specialized concrete mixing or wet-mortar trades; installs with basic shovels, rakes, landscape rollers, and hand tamps.
• • Weed & Erosion Resistance: When properly stabilized and compacted, forms a dense crust that discourages weed growth and resists wind and light rain erosion.

Landscapers and homeowners frequently choose decomposed granite when striving for water-wise, drought-tolerant xeriscaping. It complements native grasses, succulents, and shade trees while maintaining an open, natural feel.

DG can also serve as an inexpensive, firm sub-base underneath flagstone steppers, interlocking concrete pavers, or artificial turf installations.

When grading the surrounding yard and planting garden beds adjacent to your new patio, the Topsoil Calculator helps calculate topsoil volume and ton weights.

Material density variations, sub-base preparation, and regional weather influence both quantity needs and long-term durability.

• • Unstabilized decomposed granite will track onto shoes and pet paws during rainy periods; consider stabilized DG or a door scraper mat near home entries.
• • Decomposed granite is not recommended directly adjacent to pools or wooden hardwood floors due to abrasive granite dust particles.

For long-lasting results in regions with heavy seasonal precipitation, applying a liquid topical stabilizer or installing a dedicated 3-inch crushed gravel sub-base beneath the DG layer ensures excellent subsurface drainage.

Always order 5% to 10% extra material for long pathways to accommodate subgrade irregularities, slope adjustments, and future maintenance top-dressing.

According to American Society of Landscape Architects (ASLA), unbonded decomposed granite paths require a minimum 2 to 3-inch compacted depth over a solid sub-base, with a 15% compaction allowance factored into initial material volume.

To compare your decomposed granite installation costs against a traditional solid concrete patio slab, use the Concrete Pad Cost Calculator for instant material and labor pricing.