Decomposed Granite Calculator: Tons, Yards, Coverage & Cost

Decomposed granite (often shortened to DG) is sold by volume, weight, or the bag, depending on the supplier. That can make a simple question: how much decomposed granite do I need? surprisingly difficult. A square-foot measurement alone is not enough: the depth of the layer, the material's bulk density, and any allowance for compaction or waste all affect the final order.

The guide below explains each part of the calculation with practical examples for US homeowners, landscapers, and DIY builders. The figures are planning estimates, not guaranteed yields for every quarry product. For your final order, use the specifications and installation instructions for the exact DG material you intend to buy.

How to Use the Decomposed Granite Calculator

A good DG estimate begins with measurements you can verify on the ground. Before working out material weight or cost, make sure you know exactly which area needs the finished granite surface. A narrow garden path and a large patio might use the same material, but they require very different quantities.

Step 1: Measure the Project Area

For a rectangular space, measure its length and width in feet. Multiply the two measurements to find square footage. A path that is 25 feet long and 4 feet wide covers 100 square feet. For a circular area, measure the radius and use the circle-area formula, π × radius². For a curved path with a reasonably consistent width, measure along its centerline and multiply by its average width.

If your design contains several shapes, calculate each section separately and add the areas together. Exclude large planting beds, permanent structures, and other places that will not receive DG. Accurate area measurements prevent more ordering errors than adding an arbitrary amount of extra material at the end.

Step 2: Decide on the Finished DG Depth

Choose the thickness of the decomposed granite after installation, not the total depth of the excavation. The finished DG layer is different from any crushed-stone base beneath it. Depth depends on the intended use and, for stabilized products, the manufacturer's published installation requirements.

Step 3: Convert Area Into Material Volume

Multiply the surface area by the selected depth to find cubic feet, then divide by 27 to obtain cubic yards. A supplier may sell the same product by the ton instead. In that case, convert cubic yards to tons using the supplier's bulk density, or use a clearly labeled estimate when product-specific data is unavailable.

Step 4: Check Allowances and Your Order

Review any separately applied waste or compaction allowance, the supplier's minimum order, and delivery charges. Do not automatically apply a generic compaction percentage if a quoted material yield already accounts for compaction. A final check of these details can save both money and an extra delivery.

How Much Decomposed Granite Do I Need?

The quantity you need depends primarily on area × depth. Covering a 200-square-foot patio with a 3-inch finished layer requires twice the geometric material volume of covering a 100-square-foot patio at the same depth. Likewise, increasing depth from 2 inches to 4 inches doubles the required volume, even when the area stays the same.

To make the quantities easier to picture, the table below shows the finished geometric volume for several common surface areas. It does not include extra material for waste, compaction, uneven ground, or supplier rounding.

All values are rounded. These are calculated from the desired finished layer dimensions, before ordering adjustments.

How Much DG Do I Need for 100 Square Feet?

At a 3-inch finished depth, 100 square feet contains 25 cubic feet of material, equivalent to 0.93 cubic yard. At the illustrative density of 1.40 US tons per cubic yard, that represents about 1.30 US tons. These figures describe the geometrically measured layer; an actual order may be larger if the selected product requires additional loose material to reach the finished depth.

At a shallower 2-inch layer, the same area needs about 0.62 cubic yard. At 4 inches, it needs about 1.23 cubic yards. This is why the correct design depth matters more than guessing a standard number of tons for a given square footage.

How Much DG Do I Need for a Large Patio or Path?

A 500-square-foot area at 3 inches requires approximately 4.63 cubic yards of finished material volume. Using 1.40 tons per cubic yard for illustration gives approximately 6.48 tons before allowances. If a contractor or supplier recommends a different density, the weight estimate changes even though the measured layer volume does not.

For an irregular project, avoid treating the entire site as one large rectangle if much of that rectangle contains planted islands, steps, or buildings. Divide the design into smaller measurable sections. That makes both the initial calculation and any subsequent ordering adjustment more defensible.

Why Two DG Estimates May Be Different

Two people can enter the same length and width yet receive different results because they choose different depths, assume different bulk densities, or apply different ordering allowances. A supplier may also quote tons while a calculator shows cubic yards. Neither unit alone tells you the actual coverage until the material density and layer thickness are known.

For a fuller breakdown of coverage rates, visit the decomposed granite coverage chart.

How to Calculate Decomposed Granite: Formulas and Examples

You do not need complicated construction software to calculate DG material. The basic process is to work from two-dimensional surface area to three-dimensional volume, then convert volume to weight if necessary. Keep the units consistent and make any order allowances explicit.

Calculate the Area in Square Feet

For a rectangle or square:

Area (sq ft) = Length (ft) × Width (ft)

For a circular seating space or fire pit surround:

Area (sq ft) = π × Radius (ft) × Radius (ft)

For example, a circular space with a 6-foot radius has an area of approximately 113.1 square feet. If the circle contains a central feature that will not be covered, calculate and subtract that feature's area.

For multiple rectangular sections, calculate each separately and sum the results. A 30-foot-by-4-foot pathway plus a 10-foot-by-10-foot sitting area measures 120 + 100 = 220 square feet, assuming no overlap.

Convert Area and Depth to Cubic Feet

Depth is often measured in inches while the surface is measured in square feet. First divide the depth in inches by 12 to express it in feet.

Volume (cu ft) = Area (sq ft) × Depth (in) ÷ 12

For a 200-square-foot path at a 3-inch finished depth:

200 × 3 ÷ 12 = 50 cubic feet.

This number is the physical volume of the finished layer at its stated dimensions. It does not, by itself, tell you how much loose product to buy if the layer will be compacted.

Convert Cubic Feet to Cubic Yards

Bulk landscape materials are frequently quoted in cubic yards. One cubic yard is 27 cubic feet, so:

Cubic yards = Area (sq ft) × Depth (in) ÷ 324

For the same example, 200 × 3 ÷ 324 = 1.85 cubic yards (rounded). If you measure depth in feet instead, calculate area × depth in feet and then divide by 27. Both approaches produce the same answer.

Convert Decomposed Granite Cubic Yards to Tons

The conversion from cubic yards to tons is not fixed for every DG product. It depends on the material's bulk density, which reflects the weight of the aggregate and the spaces between its particles.

US short tons = Cubic yards × Bulk density (US tons/yd³)

At an illustrative density of 1.40 US tons per cubic yard, 1.85 cubic yards weighs approximately 2.59 tons. If the supplier specifies 1.30 tons per yard, the same 1.85 cubic yards is about 2.41 tons. Always use the supplier's value when one is available.

A US short ton contains 2,000 pounds. It is not the same as a metric tonne, which is about 2,204.62 pounds.

Worked Example: A 10 × 20-Foot DG Pathway

Suppose you plan a 10-foot-by-20-foot area with a finished decomposed granite depth of 3 inches. Your goal is to estimate volume and weight before discussing the order with a landscape supplier.

1. Area: 10 × 20 = 200 sq ft.
2. Finished depth: 3 ÷ 12 = 0.25 ft.
3. Finished volume: 200 × 0.25 = 50 cu ft.
4. Cubic yards: 50 ÷ 27 = 1.85 yd³.
5. Illustrative weight: 1.85185 × 1.40 = 2.59 US tons.

If, only for illustration, you add a separate 10% ordering overage to the volume, 1.85185 × 1.10 = 2.04 cubic yards, equivalent to approximately 2.85 US tons at the same assumed bulk density. This 10% is not a universal compaction rate. Do not add it if a supplier's recommended quantity has already accounted for compaction or yield.

The calculation answers how much material a defined layer represents. It cannot tell you whether the design is suitable for the soil conditions, vehicle loads, or stabilizer system. Those are installation questions to confirm separately.

Decomposed Granite Coverage Chart: Square Feet per Ton and Cubic Yard

A decomposed granite coverage calculator answers the same question from the opposite direction: instead of asking how much DG a space requires, it asks how much space a known quantity can cover. This is useful when comparing bulk quotes or deciding how far a partial load might stretch.

The figures below assume an illustrative bulk density of 2,800 lb per cubic yard, equal to 1.40 US short tons per cubic yard. This is a practical reference based on a published supplier figure, not a standard density for every product. Coverage refers to geometric volume with no compaction or waste adjustment.

Rounded coverage values use 1.40 US tons/yd³. Compaction, loss, uneven thickness, and product differences may reduce real-world coverage.

How Much Does 1 Ton of Decomposed Granite Cover?

At 3 inches thick, one US ton covers approximately 77 square feet under the table's density assumption. At 2 inches, the estimated coverage increases to roughly 116 square feet. If you spread the same ton across more area, the layer necessarily becomes thinner.

This relationship is why a generic statement such as “one ton covers 100 square feet” is incomplete. Without specifying layer depth and material density, it can easily mislead someone placing an order.

How Much Area Does 1 Cubic Yard of DG Cover?

One cubic yard occupies 27 cubic feet. At a uniform 3-inch depth, that volume covers 108 square feet. At 2 inches, it covers 162 square feet. Those numbers come directly from geometry and are independent of the aggregate's weight, but they still describe the volume of the measured layer rather than a guaranteed compacted yield.

If a landscape yard sells by cubic yard while another quotes by weight, ask both for the material's expected delivered density or coverage. The complete DG coverage guide explains these comparisons in more detail.

How Does Installation Depth Affect Coverage?

Coverage and depth move in opposite directions. Doubling the thickness halves the square footage covered by the same physical volume. A 3-inch layer uses 50% more DG than a 2-inch layer over the same area, while a 4-inch layer uses one-third more than a 3-inch layer.

Do not reduce the specified installation depth simply to make the purchased material reach farther. A thinner surface might not perform as intended, particularly where compaction, regular foot traffic, or a binder system is involved.

How Deep Should Decomposed Granite Be?

There is no single correct decomposed granite depth for every landscape. The proper thickness depends on the intended use, the type of DG, the supporting base, local drainage, and the product's installation specification. A decorative surface layer on an existing landscape bed is not the same construction system as a compacted pathway carrying heavy foot traffic.

These are planning examples, not construction instructions. Different published manufacturer systems specify different layer thicknesses; follow the selected system's guidance rather than treating a general depth table as a universal requirement.

Depth for Garden Walkways and Paths

For a pathway, first identify whether you are buying loose natural DG or a stabilized paving mix. Some stabilized pathway details show a 2- to 3-inch surface layer over a prepared aggregate base. Other systems specify a greater depth. The important measurement for calculating the DG quantity is the finished DG layer, excluding any separate road-base material.

A gently sloping footpath also needs a reasonably uniform finished depth. If the excavated grade varies significantly, determine whether the base needs correction rather than simply filling all the low spots with extra surface DG.

Depth for Patios and Seating Areas

A DG patio should be designed for its expected traffic and furniture use. Stabilized surfaces can provide more resistance to displacement than an unstabilized, loose layer, but product preparation and installation requirements vary. When estimating a patio, use the required finished thickness for the actual paving system, not a thickness copied from a decorative garden-bed example.

Depth for Driveways

A vehicle surface places greater demands on the subgrade, base, surface layer, and drainage. Some DG paving specifications call for thick surface layers and substantial compacted aggregate bases for vehicular use, while other proprietary stabilized products specify different construction details. Do not assume that a 2- or 3-inch decorative layer is appropriate for regular vehicles.

For project-specific information, read how deep decomposed granite should be and the decomposed granite driveway guide.

How Much Does Decomposed Granite Weigh?

Decomposed granite may be sold by the cubic yard, the US ton, or in retail bags. To move between those units, you need a density estimate. Bulk density is the weight of a quantity of aggregate including the air spaces between individual particles; it is not the density of a solid granite slab.

How Much Does a Yard of DG Weigh?

For an illustrative conversion, one cubic yard weighing 2,800 pounds equals 1.40 US short tons. A landscape supplier may list a different figure because grading, particle shape, fines, and moisture can affect bulk weight. Published supplier information should take priority over a generic estimate.

These are examples at one stated bulk density, not a universal weight chart for every quarry's DG.

Why Moisture and Particle Size Matter

Fine particles can occupy the voids between larger grains, affecting how densely a material packs. Moisture changes delivered weight without necessarily changing the usable solid quantity in the same way. A dry, loose stockpile and a damp, compacted surface should not be assumed to have identical bulk densities.

A product described as 1/4-inch minus contains particles up to approximately a quarter inch as well as smaller fines. The balance of coarse particles and fines influences the way the aggregate handles, compacts, and drains. These are reasons to rely on the supplier's description of the actual material rather than substituting a figure for unrelated decorative gravel.

Cubic Yards to Tons: A Quick Conversion

For planning with the 1.40-ton-per-yard example, multiply cubic yards by 1.40 to estimate US tons. To move the other way, divide tons by 1.40. Thus, 2 tons is approximately 1.43 cubic yards under that specific assumption. A different density produces a different result.

If you are arranging pickup, remember that these loads are heavy. Verify both the weight of the material and your vehicle's payload rating; do not rely on bed size alone to determine whether a load is safe to transport. See the detailed decomposed granite weight per cubic yard guide.

Decomposed Granite Compaction, Waste, and Ordering Allowances

The geometric formulas above describe a finished layer at its specified dimensions. Ordering is more complicated when the delivered material is loose and must be compacted into that layer. Some material systems publish loose-to-compacted yield information, while others provide a direct coverage recommendation. The distinction matters because applying both can overstate the order.

Loose Volume Is Not Always Finished Volume

When aggregate is placed and compacted, particles rearrange and void spaces can decrease. A loose layer may become thinner after compaction. If your design requires a certain finished thickness, you may need to place more loose material initially. The amount depends on the product and compaction method; it is not a universal constant for all decomposed granite.

For example, a manufacturer might tell installers to place a 4-inch loose layer to produce a 3-inch compacted layer. In that specific example, the starting volume is 4 ÷ 3, or about 33% greater than the finished volume. That is not the same as simply adding 25% to the finished volume. The 25% figure describes the reduction from the initial 4-inch loose depth to the final 3-inch depth.

Compaction Allowance vs. Waste Allowance

A compaction allowance addresses the difference between material supplied loose and the required installed volume. A waste or handling allowance addresses spillage, loss, small irregularities, and the practical limits of measuring a job site. They represent separate causes and should only be applied when justified.

If a specific product loses 20% of its loose volume through compaction, the loose material needed is the desired finished volume divided by 0.80. That means 1 finished cubic yard requires 1.25 loose cubic yards under that assumption. By contrast, adding a flat 20% overage gives 1.20 cubic yards, which is a different calculation.

How Much Extra Material Should You Order?

There is no honest one-size-fits-all percentage. Confirm the supplier's stated yield, whether the quote is based on loose or compacted volume, and whether the installation method requires an adjustment. Then allow separately for real handling losses or irregular areas as appropriate.

Do not add a “compaction factor” twice: once in the calculation and again when placing your order. When a supplier gives you a recommended number of tons for your dimensions and project type, ask which assumptions that recommendation already includes.

A detailed explanation of installing and compacting the surface is available in how to compact decomposed granite.

Decomposed Granite Cost Calculator: Estimate Your Material Budget

A decomposed granite cost calculator begins with the material quantity and multiplies it by a quoted unit price. The challenge is comparing supplier prices fairly. One seller may price by the cubic yard, another by the ton, and a home improvement retailer may sell 0.5-cubic-foot bags. None of those prices is directly comparable until you account for unit conversions, delivery, and any differences in product type.

How to Calculate Material Cost

For material sold by the cubic yard:

Material cost = Cubic yards ordered × Price per cubic yard

For material sold by the US ton:

Material cost = US tons ordered × Price per ton

Then add applicable delivery charges, taxes, and any separately purchased binders or accessories. Equipment and labor are different categories and should not be silently included in a material-only estimate.

Example: Estimating a DG Pathway Budget

Return to the 200-square-foot, 3-inch finished-depth example. Its geometric volume is about 1.85 cubic yards. Assume for this example only that an appropriate, non-duplicated 10% ordering allowance increases the quantity to about 2.04 cubic yards. At a hypothetical supplier price of $90 per cubic yard, the material subtotal is approximately $183.33. Add a hypothetical $65 delivery fee and the estimated total becomes $248.33, before taxes and installation.

These prices are deliberately illustrative, not a promise of what a supplier charges today. Replace them with a local written quote. If a supplier bills by ton, use its density to convert the order to the corresponding weight and then apply its price per ton.

Cost per Ton vs. Cost per Cubic Yard

At 1.40 tons per cubic yard, a quoted $90 per yard corresponds to about $64.29 per US ton for the same product, before any fees. This comparison works only when the bulk density is appropriate and both suppliers are selling material of equivalent grade and condition.

Natural DG and stabilized mixes may have substantially different prices. Published cost guides report separate price categories for these materials, but local availability, color, delivery distance, and product packaging can change the actual amount you pay.

Bagged DG vs. Bulk DG

Small bags are convenient for minor repairs, tight-access spaces, or limited areas. For larger projects, the required bag count can be substantial. A 0.5-cubic-foot bag contains 1/54 of a cubic yard by labeled volume. That means 27 cubic feet (or one cubic yard) equals 54 bags of 0.5 cubic foot each, before any differences in actual yield or handling loss.

Our example project needs 50 cubic feet at the finished geometric volume, equivalent to 100 such bags. Under the illustrative 10% ordering adjustment, the target rises to 55 cubic feet, or 110 bags. A bag's stated volume and its weight are different measurements: do not assume every 0.5-cubic-foot bag weighs the same.

Material Cost Is Not Installed Project Cost

A finished patio or pathway may require excavation, removal of existing soil, compacted aggregate base, edging, stabilization products, equipment rental, grading, and labor. Those items can matter as much as the surface aggregate itself. A material-only estimate should never be represented as a full installed-cost quotation.

For price factors and buying considerations, see the decomposed granite cost per ton, yard, and square foot guide.

Types of Decomposed Granite and How They Affect Your Estimate

Decomposed granite is a granular material derived from the breakdown of granite rock. It typically contains a mixture of small stone particles and fines, with color varying by source. However, not every product marketed for a DG-style surface has the same composition, binding method, or installation requirements.

Natural or Loose Decomposed Granite

Natural, unstabilized DG contains no added binding system intended to form a hard paving surface. It can be useful for informal paths, some landscape areas, and applications where a softer or more natural-looking surface is acceptable. Its movement and maintenance requirements depend on traffic, rainfall, slope, and edging.

For estimation, use the material's actual density and the appropriate depth. Do not assume a natural DG product will compact or perform identically to a stabilized blend.

Stabilized Decomposed Granite

Stabilized DG uses a binder or stabilizing treatment to improve the integrity of the finished surface. Products differ: some are premixed while others require specific blending or surface application. Manufacturer instructions determine binder quantity, aggregate grading, moisture, compaction, thickness, and curing conditions.

A stabilizer may be priced separately, and its application rate is not automatically part of a DG volume estimate. When comparing quotes, determine whether the listed “stabilized DG” price includes the binder and any special preparation.

Resin-Bound and Other Bound Aggregate Systems

Resin-bound or polymer-bound aggregate surfaces are related hardscape options but should not be treated as interchangeable with natural loose DG. Their components, surface characteristics, installation methods, and cost structure can differ. A general DG quantity calculation may help visualize the area, but it cannot replace a proprietary system's material schedule.

Read what decomposed granite is and stabilized vs. unstabilized DG for detailed material selection guidance.

Calculating Decomposed Granite for Different Projects

The same area-and-depth formula can be used for many outdoor projects, but the required finished depth and underlying construction are not the same everywhere. The following examples show how to approach the measurement side of each project. They are not instructions to use one thickness in every situation.

Garden Pathways and Walkways

A long pathway is often simpler to measure than it looks. Multiply the length measured along the centerline by the average finished width. For example, a 25-foot path averaging 4 feet wide covers about 100 square feet. If a product specification calls for a finished 3-inch DG layer, the geometric requirement is 0.93 cubic yard, or about 1.30 tons at the illustrative 1.40-ton-per-yard density.

If the path widens at a gate or connects to a circular sitting area, add those shapes separately. Do not forget edging, slopes, and changes in grade when planning the installation. Visit the decomposed granite pathway guide for preparation and surface details.

Patios and Outdoor Seating Areas

A 12-foot-by-12-foot patio has an area of 144 square feet. At an example finished depth of 3 inches, its layer volume is 36 cubic feet, equal to 1.33 cubic yards and about 1.87 tons at the stated reference density. Any applicable ordering adjustment comes afterward.

Patios with curved edges or a central planting cutout should be broken into smaller shapes to avoid paying for material that cannot be used. A patio that will support heavy furniture or frequent use may also benefit from an appropriate stabilized system. Explore the decomposed granite patio guide before choosing materials.

Driveways and Vehicle Areas

For a driveway, start with the full length and width, including widened parking areas and turning pads. A 10-foot-by-40-foot drive covers 400 square feet. However, do not assign a DG thickness from its dimensions alone. Vehicle weight, drainage, soil, the aggregate base, and the chosen paving system all influence the specification.

Once the finished DG thickness is defined by a suitable design or manufacturer guidance, the volume formula works exactly as it does for a footpath. Remember that any compacted road base is a separate material and should not be accidentally included in the DG quantity. Read the decomposed granite driveway guide for suitability and construction considerations.

Landscape Beds, Xeriscaping, and Decorative Areas

For nontraffic landscape areas, DG may be used as decorative ground cover where appropriate. Divide planting beds into simple shapes and subtract the space occupied by large features that won't be covered. A 20-foot-by-10-foot bed is 200 square feet; a 2-inch geometric layer would occupy approximately 1.23 cubic yards.

For xeriscaping or other water-conscious landscape designs, consider surface runoff, erosion, maintenance, and compatibility with the planting scheme, not just the calculated quantity. “Permeable” does not mean that every compacted DG installation absorbs or drains water at the same rate. The DG landscaping guide discusses these uses in context.

Common Decomposed Granite Calculation Mistakes

Small estimating mistakes multiply quickly when you are ordering thousands of pounds of landscape aggregate. Checking the following issues can make your initial number more useful.

Confusing Square Feet With Cubic Yards

Square feet measure a surface. Cubic yards measure the material volume required to create a layer on that surface. A supplier cannot determine the right cubic-yard order from square footage unless the finished depth is also known. Write down both the area and the intended layer thickness before converting units.

Using the Excavation Depth as the DG Depth

A path might include a compacted base beneath its finished DG surface. If the entire excavation is 6 inches deep but only 3 inches will be DG, using 6 inches in the DG estimate could double the calculated surface material. Treat the base and the surface layer as separate quantities.

Mixing Up Tons and Tonnes

For US bulk landscaping orders, “ton” usually means US short ton, or 2,000 pounds, but you should confirm the supplier's unit. A metric tonne is about 2,204.62 pounds. This difference affects conversions and vehicle-loading plans.

Using the Wrong Density or an Unexplained Overage

The weight of solid granite is not the same as the bulk weight of loose decomposed granite. Similarly, a generic “add 20%” rule is not a substitute for a product-specific compaction yield. State every assumption and apply it only once.

Forgetting Overlaps, Curves, and Delivery Constraints

Calculate irregular areas carefully, subtract excluded sections, and avoid counting overlapping shapes twice. Finally, check the supplier's minimum order, loading method, delivery access, and rounding rules. A precise mathematical answer may still need to be rounded to a practical purchase quantity.

Decomposed Granite Calculator FAQs

How much decomposed granite do I need for 100 square feet?

At a 3-inch finished depth, 100 square feet requires approximately 0.93 cubic yard of geometric DG volume. At a reference density of 1.40 US tons per cubic yard, that is about 1.30 US tons. A final purchase amount may be different after applying the appropriate loose-to-compacted yield and any justified handling allowance.

How much DG do I need for a 10 × 10 area?

A 10-foot-by-10-foot space covers 100 square feet. At 2 inches, the geometric DG volume is about 0.62 cubic yard; at 3 inches, it is about 0.93 cubic yard; and at 4 inches, about 1.23 cubic yards. Choose the depth from the actual project's requirements rather than selecting it to fit a particular budget.

How many square feet will 1 ton of decomposed granite cover?

At an illustrative density of 2,800 pounds per cubic yard, one US short ton covers approximately 116 square feet at 2 inches, 77 square feet at 3 inches, or 58 square feet at 4 inches. These are geometric coverage figures without allowance for compaction or waste. Your material's supplier may give a different density and coverage rate.

How many cubic yards of decomposed granite are in one ton?

At 1.40 US tons per cubic yard, one US ton equals approximately 0.71 cubic yard. This is an example conversion, not a guaranteed volume. To find the correct conversion for a quoted product, divide one ton by that product's stated tons-per-cubic-yard figure.

How much does one cubic yard of decomposed granite weigh?

One published supplier specification lists DG at about 2,800 pounds per cubic yard, equal to 1.40 US short tons. Other products may weigh more or less depending on grading and moisture. Confirm the delivered density with your supplier, especially if the order weight affects transportation or site access.

How much decomposed granite should I order for a pathway?

Multiply your pathway's length by its average width to find area. Multiply area by the specified finished DG depth to calculate layer volume, then convert to cubic yards or tons. Confirm whether the supplier's yield accounts for compaction before adding extra material. Wider ends, junctions, and curved seating spaces should be measured separately.

Does decomposed granite need to be compacted?

Many DG pathway and paving systems rely on controlled compaction to achieve their intended finish, but the correct equipment and process depend on the selected material and binder. Some products specify particular moisture conditions, layer thicknesses, and compaction techniques. Decorative loose DG installations can have different requirements. Follow the installation instructions for your product.

What is the best depth for decomposed granite?

There is no universal best depth. Decorative ground cover, pedestrian pathways, stabilized patios, and vehicle areas require different planning. Some pathway systems use approximately 2–3 inches of DG over a separate prepared base, while others specify different depths. Check the product's written requirements and do not confuse surface thickness with total excavation depth.

Is decomposed granite the same as crushed granite?

Not always. Decomposed granite generally describes granitic material produced through natural weathering, while crushed granite may refer to mechanically crushed stone with a different gradation. Landscape suppliers sometimes use overlapping commercial names. Ask about particle size, fines, intended use, and the actual product specification rather than assuming the terms describe identical materials.

How much does decomposed granite cost per cubic yard?

Prices vary by region, material type, color, supplier, packaging, and delivery. Published cost guides distinguish natural DG from stabilized products, and retail quotes may change over time. The most reliable estimate comes from multiplying your order quantity by a current local unit price, then adding delivery, tax, and separately purchased installation materials.

Can I use this method for a circular patio or curved walkway?

Yes. For a circular patio, calculate area using π × radius², then apply the same depth and volume conversions. For a walkway with a fairly constant width, multiplying its centerline length by the average width is a useful estimate. Divide complex areas into separate shapes, subtract overlaps, and total the results before adding any justified ordering allowance.

Is the estimated cost the same as the total installation cost?

No. A DG material estimate ordinarily covers the aggregate itself and any delivery costs you explicitly include. Excavation, grading, base aggregate, edging, stabilization products, labor, equipment rental, and site repairs are additional potential costs. A quote for a completed patio or driveway should itemize those elements separately.

Explore More Decomposed Granite Guides

This calculator is the starting point for choosing a quantity. If you are still deciding what material to buy or how the surface should be constructed, use the related guides for the more detailed answers. They cover the topics that affect a project without turning the calculator page into a full installation manual.

Material planning: Compare estimates with the DG coverage chart, review decomposed granite depth, or understand weight per cubic yard. For buying decisions, read the DG cost guide.

Material selection and installation: Learn what decomposed granite is, compare stabilized and unstabilized DG, and review installation, compaction, and drainage considerations.

Project-specific help: Explore DG for pathways, patios, driveways, and landscaping. If you are choosing between hardscape surfaces, compare DG vs. gravel and DG vs. crushed granite.

How Our Decomposed Granite Estimates Are Calculated

The underlying quantity method is straightforward: measure the area, multiply by the finished DG layer depth, convert cubic feet to cubic yards, and, when needed, use bulk density to estimate US tons. Any compaction, waste, or purchasing adjustment must be shown separately rather than hidden in the basic formula. Pricing is only an estimate until it is matched to a current supplier quotation.

The coverage and weight examples on this page use 2,800 pounds per cubic yard (1.40 US short tons/yd³) as an illustrative material density. This is based on published supplier information, not a measurement of every decomposed granite product. For safety-sensitive loads, specialized paving systems, or final purchasing, use the specifications of the material actually supplied.

Sources and Technical References

• Main's Landscape Supply - Decomposed Granite: example product density, cubic-yard pricing, and 0.5-cubic-foot bag size.
• Acme Sand - Stabilizer Binder Additive for Decomposed Granite (PDF): one manufacturer's approach to compacted base, DG depth, blending, and installation.
• PROSOCO - Pathway Stabilizer Product Data Sheet (PDF): product-specific limitations, aggregate grading, surface preparation, and edging guidance.
• HomeGuide - Decomposed Granite Cost: general market cost factors and differences among DG products.

Important: Supplier specifications and prices can change. Check product data sheets and local quotes before installing, purchasing, or transporting material. For the full explanation of calculation assumptions, visit the calculator methodology.