Calculate cubic yards, tons, and bags of gravel for driveways, paths, and landscaping. Choose gravel type for accurate density estimates.
Cubic Yards
1.85
yd³
Tons
2.50
short tons
50 lb Bags
100
bags needed
Estimated Cost
$125
$50/ton
Bags column scaled ÷10 for visual clarity
A gravel calculator converts your project dimensions — length, width, and desired depth — into the cubic yards and tons of aggregate you need to order from a supplier. Gravel is the category name covering a wide range of crushed stone, processed aggregate, pea gravel, river rock, and decomposed granite products. Each material has a different density, and suppliers may quote by either volume (cubic yards) or weight (tons), which is why converting between units accurately is essential before placing an order.
The core calculation is straightforward: Cubic Yards = (Length ft × Width ft × Depth ft) ÷ 27. Depth must be converted from inches to feet first. The result in cubic yards is then multiplied by the material's density in tons per cubic yard to get the weight-based order quantity. Different gravel types have significantly different densities — pea gravel weighs approximately 1.4 tons per cubic yard while dense river rock can reach 1.65 tons per cubic yard for the same volume. Using the wrong density can cause weight-based order errors of 15–20%.
Gravel and crushed stone are among the most widely used construction and landscaping materials in North America, with applications ranging from driveway bases and garden paths to French drains, concrete aggregate, erosion control, playground surfaces, and decorative landscaping. The United States produces approximately 1.3 billion metric tons of crushed stone annually — the single highest-volume non-fuel mineral commodity in the country, reflecting how ubiquitous aggregate is in construction and infrastructure at every scale.
Getting the quantity right matters for both cost and project success. Under-ordering gravel for a driveway means a second delivery trip — often at full minimum delivery charge — for a small top-up quantity. Over-ordering leaves you with leftover material to dispose of or store. For large projects, a 10% error in calculation translates directly into hundreds of dollars of over- or under-spent material cost. This calculator eliminates the arithmetic entirely and outputs both cubic yards and tons, the two ordering units you will encounter when calling suppliers.
Beyond quantity, gravel selection — type, size, and application depth — directly determines project performance and longevity. A driveway built with the right base stone and proper depth lasts decades with minimal maintenance. The same driveway built with the wrong stone type or inadequate depth develops ruts, potholes, and drainage problems within a single season. This content section covers the full spectrum: calculation methodology, material selection, depth guidance, cost estimation, common mistakes, and advanced technical considerations for effective gravel project planning.
Enter your area dimensions (length and width in feet, or total square footage for irregular areas), specify the desired depth in inches, and select your gravel type. The calculator applies the standard volume formula, converts to cubic yards and cubic feet, then multiplies by your selected material's density to produce the equivalent weight in tons. A built-in waste factor field lets you specify the appropriate overage for your application.
For irregular areas, measure the overall bounding rectangle and enter that area, or break the project into sections (multiple rectangles) and calculate each separately. The calculator supports rectangular, circular, and custom square-footage inputs so that non-standard project shapes — curved garden beds, curved driveways, irregular ponds — can be accurately estimated by measuring the area in square feet and entering it directly.
The depth selection is the most consequential input. Decorative garden paths and beds typically need 2–3 inches. Driveways for passenger vehicles require 4–6 inches of compacted aggregate. Structural base layers for pavers, concrete, or retaining wall footings typically need 4–8 inches depending on soil conditions and load requirements. French drain trenches require the trench to be filled to within a few inches of grade with clean gravel — usually 12–24 inches of depth. The calculator provides standard depth recommendations for common applications to help guide this critical specification decision.
Length & Width
Measure end-to-end in feet along both horizontal dimensions. For curved edges, measure the longest span. For L-shaped areas, split into two rectangles and sum. Round to the nearest 0.5 foot — precision beyond that adds false accuracy given the 10–15% waste factor already applied.
Depth (Inches)
The vertical thickness of gravel required. Decorative paths: 2–3 inches. Garden beds: 2–4 inches. Driveways (surface layer): 2–3 inches. Driveways (total compacted depth): 4–8 inches. French drains: fill the trench to grade (12–24+ inches). Convert to feet by dividing by 12 before applying the formula.
Material Density (Tons/CY)
The weight per cubic yard varies by stone type and moisture. Pea gravel: ~1.4 t/cu yd. Crushed stone ¾": ~1.5 t/cu yd. River rock: ~1.65 t/cu yd. Decomposed granite: ~1.35 t/cu yd. Lava rock: ~0.85 t/cu yd. Using the correct density is essential when ordering by the ton — the most common supplier billing unit.
Waste Factor
Gravel is lost to compaction (stone settles into sub-grade), edge migration, and measurement imprecision. Standard waste allowances: decorative applications 10%, driveway base layers 12–15%, French drains 10%, fill applications 15–20%. Never order without a waste factor — ordering exactly the calculated quantity almost always results in a short pour and a costly second delivery.
Area Shape
Rectangular areas use L × W. Circular areas use π × r². Triangular areas use 0.5 × base × height. For highly irregular shapes, the grid method works: divide the area into 1-foot squares, count full squares, add partial squares as fractions, multiply by depth. Over-estimating a complex area's square footage by 5–10% and letting the waste factor cover it is often more practical than exact calculation.
Sub-Grade Conditions
Soft, sandy, or organic soils require deeper gravel sections and geotextile fabric to prevent the aggregate from sinking over time. In clay soils with poor drainage, consider adding a drainage layer of clean #57 stone beneath the surface course. Rocky or compacted native soil requires less base depth. Soil bearing capacity directly affects the structural depth requirements for vehicle-bearing applications like driveways.
Driveway — 50 ft × 12 ft at 4 Inches
Circular Garden Bed — 10 ft Diameter at 3 Inches
French Drain — 60 ft Long × 6 in Wide × 24 in Deep
Backyard Patio — 16 ft × 20 ft Decorative River Rock at 2 Inches
Gravel projects fail most often not because of poor installation technique but because of inadequate material quantity or wrong material selection. A driveway with insufficient base depth develops ruts and potholes within months of completion, requiring complete reconstruction rather than simple maintenance. A French drain filled with the wrong stone type — one containing fines that clog the drainage voids — will fail within a few years, requiring excavation and reinfill at substantial cost.
From a cost standpoint, material waste in gravel projects compounds quickly. A 15% under-estimate on a 30-cubic-yard job at $55/cubic yard means a second order of 4.5 cubic yards — at the minimum delivery charge of $100–$150 plus material cost of $248, this preventable mistake costs $350+. Conversely, a 20% over-estimate means 6 cubic yards of material to dispose of or store at ~$330 in wasted spending. Precise calculation with an appropriate but not excessive waste factor is the economically optimal approach for every gravel project.
For drainage applications — French drains, rain gardens, bioswales, under-slab drainage — gravel quantity and specification affect stormwater management performance with real consequences for property integrity. Under-specifying French drain length or gravel depth can result in water intrusion into basements, foundation undermining, and landscape erosion that causes thousands of dollars of damage. Getting drainage aggregate specifications right is not optional — it directly protects structural investment in property.
The environmental dimension of accurate gravel calculation is increasingly recognized in sustainable construction practices. Every ton of quarried stone requires energy for extraction, crushing, washing, and transportation. Ordering 20 percent too much material wastes not just money but embodied energy and carbon emissions. Conversely, ordering too little means a second delivery with its associated transport impacts. Getting the calculation right the first time minimizes waste, avoids redundant hauling, and reduces the project carbon footprint. For large commercial or municipal projects, accurate material estimation is often a sustainability metric tracked alongside cost performance.
Structural performance of gravel installations is directly tied to accurate depth calculation. A 4-inch gravel driveway that was calculated and installed at only 3 inches deep due to an arithmetic error has 25 percent less load-bearing capacity and will rut 40 to 60 percent faster under repeated vehicle loads than a properly designed 4-inch section. The extra inch matters because gravel strength scales non-linearly with depth — the confinement provided by surrounding stone increases dramatically with total section depth. Accurate calculation is not merely a cost optimization; it is a quality and durability requirement that determines whether the project will meet its design service life.
Supplier pricing transparency varies widely by region and supplier type. Some suppliers quote exclusively by the ton; others price by the cubic yard. Before calling any supplier, convert your calculated cubic yards to tons using the material density so you can discuss the project in whichever unit they prefer. Request an all-in delivered price and confirm whether it includes spreading or only drop delivery. A seemingly small per-unit price difference can reverse direction once delivery fees are factored in — always compare total delivered project cost, not just the material unit rate.
Permit requirements for gravel driveways vary by municipality. Some jurisdictions require a driveway permit for any new surface installation connecting to a public road, particularly where a culvert pipe crossing or roadside apron is involved. The culvert must be correctly sized for the upstream drainage watershed — an undersized culvert causes driveway flooding and road-edge erosion that the property owner may be responsible for remedying. If your driveway accesses a county or state road, contact the local public works department about encroachment permit requirements before breaking ground. Non-compliance can trigger removal orders with costs far exceeding the permit fee.
Landscape gravel and decorative stone projects carry aesthetic considerations beyond pure quantity calculation. Stone color, texture, and particle size affect how a space feels visually and functionally. Lighter-colored stones like white marble chips or tan pea gravel reflect heat and light, keeping the area cooler and brighter — an advantage in hot climates for patios. Darker stones like black lava rock or charcoal-toned crushed granite absorb heat, which can benefit paths in colder climates for snow melt. Order a small sample bag before committing to a full bulk delivery — color and texture in person often differ significantly from photos online, and returning bulk aggregate deliveries is impractical once dropped.
Long-term gravel maintenance is frequently underestimated during the project planning phase. A well-installed gravel driveway requires top-dressing with 1 to 2 inches of fresh crushed stone every 1 to 3 years — typically 2 to 5 cubic yards for a standard residential driveway — at a cost of $100 to $350 per application including material and delivery. Over 20 years, cumulative maintenance material cost may equal 50 to 100 percent of the initial installation cost. Annual raking to redistribute displaced stone from low-traffic areas back to high-wear zones extends intervals between full top-dressing cycles and keeps the surface level and functional with minimal expenditure.
1. Not Adding a Waste Factor
Ordering exactly the calculated quantity almost always leaves you short. Gravel settles into sub-grade voids, displaces at edges, and compacts under traffic — typical material loss is 10–15%. Always add at least 10% to your cubic yard calculation before ordering. Under-ordering means a second delivery fee for a small amount, often costing more than the stone itself.
2. Using Inches as Feet in the Depth Input
The single most common calculation error is forgetting to convert depth from inches to feet before multiplying. Entering a depth of 4 (meaning 4 inches) as 4 feet produces a volume estimate 12× larger than reality — you would order 89 cubic yards instead of 7.4 for a standard driveway. Always divide your depth in inches by 12 before entering it into the formula.
3. Choosing the Wrong Gravel Type for the Application
Using pea gravel on a driveway causes constant rutting and displacement because smooth, rounded particles cannot interlock under vehicle weight. Using crusher run with fines in a French drain dramatically reduces drainage capacity because fine particles fill the void spaces water needs to flow through. Match the gravel type to the application: angular stone for structural use, clean stone for drainage, rounded gravel for decorative applications.
4. Skipping Proper Sub-Grade Preparation
Gravel placed on unprepared, soft, or organic-rich soil will sink, shift, and rut rapidly. Excavating to adequate depth, removing all organic material, and compacting the native soil before adding gravel are non-negotiable steps. A plate compactor rental costs $80–$150/day — far cheaper than reordering and relaying stone because the base preparation was skipped.
5. Forgetting Edging Restraints
Without edging, gravel migrates into adjacent lawn, flower beds, and hardscape over time, perpetually depleting the coverage and requiring frequent additions. Install steel, aluminum, or composite edging before placing the final gravel layer. Anchor edging at least 4 inches deep to resist frost heave and lateral stone pressure. A $50 edging investment can eliminate $200+ in future replenishment costs.
6. Not Comparing Ton vs Cubic Yard Pricing
Suppliers may quote by different units. A quote of $35/ton and a quote of $50/cubic yard may be for similar material — or very different. Always convert both quotes to the same unit for apples-to-apples comparison. Use the formula: Tons = Cubic Yards × Density. For crushed stone at 1.5 tons/cu yd: $50/cu yd = $33.33/ton. If one supplier quotes $35/ton, the per-cubic-yard cost is actually $52.50 — slightly more expensive.
7. Underestimating Drainage Needs on Slopes
Gravel on slopes without proper drainage channels causes water to flow along the surface, eroding the stone laterally and depositing it at the base. On any slope exceeding 5%, install cross-drainage swales or drainage channels at regular intervals to divert sheet flow off the gravel surface. For driveways on steep grades (over 10%), crusher run is mandatory over clean stone because its fines bind the material in place against gravitational and hydrological movement.
Professional gravel driveway construction uses a layered system, with each layer serving a distinct structural or aesthetic function. The base layer — #3 or #4 stone, 2–4 inch diameter — provides structural support and drainage directly on the sub-grade. The middle layer — #57 stone, approximately ¾ inch — bridges the transition between large base stone and fine surface material, distributing load and improving stability. The surface layer — crusher run, ⅝-inch minus, or fine crushed stone — provides the drivable surface that compacts under traffic and resists rutting.
Calculate each layer separately: a 4-inch base layer, 2-inch middle layer, and 2-inch surface layer on a 50 ft × 12 ft driveway requires: Base: 50 × 12 × (4/12) ÷ 27 = 7.41 cu yd of #3 stone. Middle: 50 × 12 × (2/12) ÷ 27 = 3.70 cu yd of #57 stone. Surface: 50 × 12 × (2/12) ÷ 27 = 3.70 cu yd of crusher run. Total: 14.81 cubic yards across three stone types, requiring separate orders or specification to the supplier. Add 12% waste to each layer independently.
Compaction between layers is as important as the material itself. Each layer must be compacted with a plate compactor before the next layer is added. Placing the middle layer on uncompacted base stone causes the middle layer particles to sink into the base voids, mixing the two grades and compromising the structural separation that makes the layered system effective. A plate compactor rental of $80–$150/day is the most valuable equipment investment in any driveway project — the compaction step cannot be replicated by driving vehicles over the surface, which creates uneven pressure and point loading rather than uniform compaction across the full layer depth.
The crown profile — a slight rise from edge to center of the driveway — is a critical design detail for long-term performance. A 2-percent transverse slope (1/4 inch per foot) from center to edge directs surface water off the driveway rather than allowing it to pond in ruts and infiltrate the base layers. A crowned profile is established during subgrade preparation and must be maintained through each layer of aggregate installation. A driveway installed perfectly flat will develop standing water in tire depressions within the first season, accelerating stone displacement and base softening that leads to premature rut formation.
For driveways subject to heavy vehicle loads — delivery trucks, RVs, heavy equipment — consider increasing base stone depth from 4 inches to 6 inches and using a geogrid reinforcement layer at the subgrade interface. Geogrid is a plastic mesh anchored into the subgrade that distributes wheel loads laterally across a wider area, dramatically reducing point stress at any single location. A 50 ft × 12 ft driveway requires approximately 700 sq ft of geogrid at roughly $0.40–$0.80/sq ft — a $280–$560 investment that can double the effective load-bearing life of the driveway under occasional heavy loads.
| Application | Recommended Stone | Depth | Density (t/cu yd) |
|---|---|---|---|
| Driveway base | #3 or #4 stone | 4 in | 1.5 |
| Driveway surface | Crusher run or ⅝" minus | 2 in | 1.5 |
| Decorative path | Pea gravel or river rock | 2–3 in | 1.4–1.65 |
| French drain fill | #57 or pea gravel (clean) | 12–24 in trench | 1.35–1.4 |
| Under concrete slab | #57 or pea gravel | 4–6 in | 1.35 |
| Garden bed top-dress | Pea gravel or DG | 2–3 in | 1.35–1.4 |
| Erosion control slope | River rock (1–3 in) | 3–4 in | 1.65 |
| Playground surface | Pea gravel (washed) | 6–12 in | 1.4 |
Gravel serves a critical structural function in drainage applications that is fundamentally different from its role as a surface material. In drainage systems, gravel acts as a permeable void matrix through which water flows at high rates while supporting the surrounding soil structure. The key performance metric is hydraulic conductivity — the rate at which water moves through the stone layer — which depends almost entirely on particle size, particle shape, and void content. Clean, single-size, angular stone without fine particles achieves the highest hydraulic conductivity; rounded pea gravel is slightly lower due to its smoother surface; and crusher run with fines has dramatically lower conductivity because the fine particles fill the voids that water needs to flow through.
A French drain is the most common residential drainage application for gravel. The standard design involves excavating a trench 6 to 12 inches wide and 18 to 36 inches deep, laying a perforated pipe in the bottom, surrounding the pipe with 6 to 12 inches of clean washed stone (typically #57 stone or pea gravel), wrapping the entire stone and pipe assembly in geotextile filter fabric to prevent soil migration into the stone voids, and backfilling the remaining trench depth with topsoil. The gravel quantity calculation for a French drain treats the trench as a rectangular volume: length times width times depth divided by 27 for cubic yards, then multiplied by density for tons. Remember to subtract the pipe volume if the pipe diameter is large — a 4-inch perforated pipe displaces about 0.087 cubic feet per linear foot, negligible for most calculations but worth noting on long runs.
Bioswales are vegetated drainage channels lined with gravel to manage stormwater runoff from impervious surfaces — roads, parking lots, and rooftops. The gravel layer in a bioswale serves as a filter medium that removes pollutants, promotes infiltration, and provides structural stability for the channel sides. Typical bioswale gravel specifications call for 2 to 4 inches of clean crushed stone or river rock on side slopes, and 6 to 12 inches of engineered growing medium (compost mixed with sand and gravel) in the channel bottom. Gravel calculations for bioswales require accurate measurement of the trapezoidal cross-section — (bottom width plus top width divided by 2) times depth — multiplied by the channel length to get total volume. This shape requires the trapezoidal area formula rather than the simple rectangular formula, and using the wrong shape assumption can produce 20 to 40 percent errors in quantity estimates for typical bioswale dimensions.
Under-slab drainage gravel serves a different function: it acts as a capillary break and moisture management layer between the soil subgrade and a concrete slab, preventing ground moisture from wicking upward through the concrete by capillary action. The standard specification is 4 inches of clean #57 stone or pea gravel with less than 10 percent passing the number 4 sieve — meaning very few fine particles. This layer also provides a smooth, level base for slab forming, accommodates any minor subgrade settlement without affecting slab level, and provides a drainage path for any water that infiltrates at slab edges. Quantity calculation for under-slab gravel is the simplest case: slab length times slab width times depth in feet (typically 0.333 feet for 4 inches) divided by 27 for cubic yards.
| Drainage Application | Stone Spec | Min Depth | Filter Fabric? | Key Requirement |
|---|---|---|---|---|
| French drain trench | #57 or pea gravel | Fill trench | Yes — essential | Clean stone, no fines |
| Under concrete slab | #57 or pea gravel | 4 inches | No | Less than 10% fines |
| Drywell surround | #3 or #57 stone | 18–36 inches around | Yes — wrap all sides | High void content |
| Bioswale channel | River rock or #57 | 6 inches | Optional | Durable, erosion resistant |
| Foundation drain | Pea gravel or #57 | 6+ inches | Yes — critical | Maximum infiltration rate |
| Rain garden basin | #57 or DG blend | 12–18 inches | At edge only | Fast drawdown within 48 hrs |
| Permeable paver base | #57 stone | 4–6 inches | Under base | Uniform size, angular |
| Roof drain dispersion | River rock or #3 | 6–12 inches | Under stone | Large stone for flow volume |
For all drainage applications, the most critical design parameter is sizing the gravel volume large enough to handle the design storm event — typically the 10-year or 25-year storm depending on jurisdiction and application sensitivity. Undersized drainage gravel systems surcharge during intense rainfall, defeating their purpose and potentially causing property damage. Consulting a civil engineer or landscape architect for drainage design is strongly recommended for any application that protects structures from water damage — the gravel calculator handles the quantity arithmetic once the design dimensions are established, but design itself requires professional hydrological analysis.
Successful gravel projects depend as much on logistics and installation technique as on material quantity calculation. Understanding the delivery process, installation equipment requirements, and long-term maintenance needs before ordering allows you to plan the full project scope rather than discovering mid-project that you lack the equipment or access to install the material you have ordered.
Gravel delivery vehicles are heavy, and their access requirements must be evaluated before scheduling a delivery. A fully loaded single-axle dump truck weighs 26,000 to 34,000 pounds — roughly 13 to 17 tons. Tandem-axle trucks carrying 14 to 18 cubic yards can weigh 60,000 to 80,000 pounds loaded. These vehicles require a firm, level access route at least 10 to 12 feet wide, with adequate turning radius at the delivery point and overhead clearance from trees, utility lines, and structures. For projects where truck access to the installation area is restricted, the driver will spread the load as close as possible to the intended area, but moving material from the drop point to the installation area manually is slow and labor-intensive — a cubic yard of crushed stone weighs 1.4 to 1.65 tons and requires a wheelbarrow rated for at least 400 pounds and 8 to 10 wheelbarrow loads per cubic yard.
Compaction equipment determines the final quality of structural gravel installations. Loose gravel placed without compaction has 20 to 30 percent air void space that will consolidate under vehicle traffic, causing immediate rutting. For driveways and parking areas, a plate compactor (rental cost $80 to $150 per day) or vibrating roller compact each 4-inch lift of base gravel to reduce void content and increase load-bearing capacity. Layer thickness for effective compaction with a plate compactor is 3 to 4 inches maximum — thicker lifts cannot be compacted adequately from the surface. For large projects, a vibrating drum roller rental at $200 to $400 per day provides faster, more uniform compaction. For decorative paths and garden beds where compaction is not a structural requirement, a hand tamper ($30 to $50) provides adequate surface consolidation.
The gravel installation sequence for driveways follows a defined order that each step builds upon: excavate to design depth, compact subgrade, install geotextile fabric, place and compact base stone in 4-inch lifts, place and compact middle transition stone, spread and lightly compact surface course, install or verify edge restraints, and top-dress with additional surface stone if needed to achieve final grade. Skipping steps — particularly subgrade compaction and geotextile installation — produces a driveway that appears acceptable initially but deteriorates rapidly as the gravel sinks into soft subgrade material under repeated vehicle loads.
Tools Needed: Small Project (under 5 cu yd)
Equipment Needed: Driveway Project (5–30 cu yd)
Annual Maintenance Tasks
Signs the Driveway Needs Attention
Long-term gravel maintenance cost is often underestimated at project planning time. A well-installed gravel driveway requires top-dressing with 1 to 2 inches of fresh crushed stone every 1 to 3 years — typically 2 to 5 cubic yards for a standard residential driveway — at a cost of $100 to $350 per application including material. Over 20 years, cumulative maintenance material cost may equal 50 to 100 percent of the initial installation cost. This ongoing maintenance commitment is the primary reason many homeowners eventually pave over established gravel driveways — the gravel surface provides the well-prepared base for asphalt or concrete paving, making the transition economical when the aggregate of maintenance costs approaches the cost of permanent paving.
The gravel calculator works alongside several other material estimation tools for complete project planning. The asphalt calculator uses the same volume-to-weight formula structure with a different density constant, making it the natural companion for projects that combine a compacted gravel base with an asphalt wearing course. The cubic yards calculator provides the volume calculation without the weight conversion — useful for materials sold by volume rather than weight. The concrete calculator applies the same area-times-depth logic for rigid pavement applications over the gravel base.
The square footage calculator is the starting point for any area-based material estimate, particularly for irregularly shaped project areas that require the grid-method or decomposition into component rectangles. The paint calculator illustrates the same coverage-area relationship applied to a thin surface material, demonstrating that the underlying mathematical structure of material estimation is universal across construction and improvement projects. For drainage-focused gravel applications, the square footage tool helps measure watershed contributing area — the surface area draining to a French drain or bioswale — which determines the design capacity requirements that drive gravel system sizing.
For projects financed over time, the loan payoff calculator shows the true cost of financing a large gravel installation with a home equity or personal loan. Understanding total interest cost on a $5,000 gravel driveway financed at 8 percent over 5 years — approximately $1,083 in interest — frames the cash-versus-finance decision concretely. For ongoing maintenance budgeting, the savings goal calculator helps homeowners set aside the right monthly amount to fund the next top-dressing cycle without requiring emergency spending when the driveway condition deteriorates.
The mulch calculator uses the same depth-times-area formula as gravel but with lower material density, making it a useful cross-reference for landscaping projects where both gravel and organic mulch are used in different zones. Comparing the two calculators side-by-side illustrates how material density drives the difference between a 3-inch layer of pea gravel (approximately 1.4 tons per 100 sq ft) versus 3 inches of wood chip mulch (approximately 0.15 tons per 100 sq ft) — a 9:1 weight ratio for the same coverage area and depth, with proportionally different delivery logistics and cost.
Finally, the area converter is helpful when project measurements arrive in mixed units — a supplier quote in square meters, a blueprint in square feet, and a homeowner measurement in yards. Converting all inputs to a consistent unit before entering them into the gravel calculator eliminates the most common source of material over-ordering or under-ordering on residential and commercial gravel projects alike.
How do I calculate how much gravel I need?
Measure the length and width in feet, determine depth in inches, convert depth to feet (÷12), then: Cubic Yards = (L × W × D ft) ÷ 27. Convert to tons by multiplying by the gravel density (1.4–1.7 tons per cubic yard depending on type). Always add 10–15% extra for compaction and settling.
How deep should gravel be for a driveway?
Standard gravel driveways need 4–6 inches of compacted stone for passenger vehicles. Use a three-layer system: 4-inch base of #3 stone, 2-inch middle layer of #57 stone, 2-inch surface layer. Total compacted depth: 8 inches for best results in all weather conditions.
How much does a ton of gravel cover?
At 100 lb/ft³ density: 1 ton covers approximately 100 sq ft at 2 inches deep, 65 sq ft at 3 inches, or 50 sq ft at 4 inches. Coverage varies by gravel type — denser river rock covers less area per ton than lighter lava rock.
What type of gravel is best for a driveway?
Crushed stone or crusher run is best — angular particles lock together and compact firmly. Pea gravel rolls under tires. For base layers, use #3 stone; for the surface, crushed stone or crusher run (⅝ inch minus) works best.
What is the difference between cubic yards and tons for gravel?
Cubic yards measure volume; tons measure weight. Convert: Tons = Cubic Yards × Density. Common densities: pea gravel 1.4, crushed stone 1.5, river rock 1.65 tons per cubic yard. Always clarify which unit your supplier is quoting.
How many cubic yards of gravel do I need for a 10x10 area?
At 4-inch depth: 10 × 10 × (4/12) ÷ 27 = 1.23 cubic yards. Add 10% waste = 1.36 cubic yards (order 1.5). At 2-inch depth: 0.62 cubic yards. At $45–$75 per cubic yard, material cost for a 10×10 at 4 inches is $68–$113.
How much gravel do I need for a French drain?
Typical 6-inch wide × 24-inch deep French drain: Volume per foot = 0.5 ft × 2 ft = 1 cu ft per linear foot. For 50 linear feet: 50 cu ft ÷ 27 = 1.85 cubic yards, plus 10% waste = 2.04 cubic yards (about 2.9 tons of pea gravel).
What size gravel should I use?
#3 stone (2–4 inch) for structural base layers; #57 stone (¾ inch) for driveways and drainage; pea gravel (⅜ inch) for decorative paths and French drains; crusher run (mixed) for compacted base layers; decomposed granite for decorative paths requiring a firm surface.
How much does gravel cost per cubic yard?
Pea gravel: $25–$55/cu yd. Crushed stone: $20–$75/cu yd. River rock: $40–$85/cu yd. Decomposed granite: $30–$60/cu yd. Add $50–$150 delivery and $10–$35/cu yd for contractor installation. Prices vary significantly by region.
How many tons of gravel are in a cubic yard?
Pea gravel: ~1.4 tons/cu yd. Crushed stone ¾-inch: ~1.5 tons/cu yd. River rock: ~1.65 tons/cu yd. Decomposed granite: ~1.35 tons/cu yd. Lava rock: ~0.85 tons/cu yd. Wet gravel weighs 5–10% more than dry.
How do I calculate gravel for a circular area?
Area = π × radius². Then: CY = Area × Depth in ft ÷ 27. Example: 8-ft diameter circle at 3 inches: Area = 3.14 × 16 = 50.3 sq ft. CY = 50.3 × 0.25 ÷ 27 = 0.47 cu yd. Add 10% = 0.52 cu yd.
Can I put gravel directly on dirt?
Yes, but install landscape fabric first to prevent soil-gravel mixing and weed growth. Use heavy contractor-grade geotextile, not lightweight garden fabric. For driveways, geotextile fabric beneath base stone is strongly recommended for longevity.
How much does a dump truck load of gravel cost?
A standard truck holds 10–14 cubic yards. At $25–$75/cu yd material plus $50–$150 delivery, a truckload costs $300–$1,200. Small loads under 5 cubic yards may be more economical to pick up in a trailer or buy in bags.
What is crushed stone vs gravel?
Gravel is naturally rounded by water erosion — smooth edges. Crushed stone is mechanically fractured from quarried rock — sharp, angular edges. Crushed stone compacts better and is preferred for driveways and structural base layers. Rounded gravel is better for drainage and decorative applications.
How often do I need to add gravel to a driveway?
Top-dress every 1–3 years depending on traffic and weather. Add 1–2 inches of fresh crushed stone and regrade. Annual raking to fill ruts and redistribute displaced stone extends intervals between major replenishments.
How do I convert square feet to cubic yards for gravel?
Shortcut formula: CY = (Square Feet × Depth in inches) ÷ 324. Example: 500 sq ft at 3 inches: 500 × 3 ÷ 324 = 4.63 cubic yards. The 324 factor = 12 (inches per foot) × 27 (cubic feet per cubic yard).
What is #57 stone?
#57 stone is crushed aggregate sized 3/4 to 1 inch, one of the most commonly used construction aggregates. Used in concrete mix, driveway surfaces, drainage around pipes, French drain fill, and under slabs. Density: approximately 1.35 tons/cubic yard.
How do I stop gravel from spreading on a driveway?
Install sturdy steel or composite edging along all borders. Use crusher run rather than clean stone — fines bind the material together. A geogrid anchored in the sub-base and filled with crushed stone dramatically reduces lateral migration under vehicle traffic.
What is pea gravel and what is it used for?
Pea gravel is smooth, rounded stone approximately 3/8 inch in diameter. Used for decorative paths, playgrounds, pool surrounds, fire pit areas, and French drains. Not suitable for driveways — it rolls under tires. Density: approximately 1.4 tons/cubic yard.
How much does it cost to gravel a driveway?
For a 50 ft × 12 ft driveway at 4 inches: ~7.4 cubic yards material at $45/cu yd = $333 + $100 delivery + $200–$350 installation = $633–$783 total. DIY (you spread and compact): $433–$533.
What is the formula for calculating gravel in tons?
Tons = (L ft × W ft × D ft) ÷ 27 × Density (tons/cu yd). Add 10–15% waste. Example: 30 ft × 15 ft at 3 inches deep with crushed stone: 30 × 15 × 0.25 ÷ 27 × 1.5 = 6.25 tons. With 12% waste: order 7 tons.
How do I prepare ground for gravel?
Remove vegetation and excavate to required depth. Grade for drainage (1–2% slope or center crown). Compact the sub-grade. Install landscape fabric. Add and compact base stone. Install edging. Add final gravel layer. Compaction of every layer is the single most important step for long-term stability.
What is decomposed granite and how is it used?
Decomposed granite (DG) is weathered granitic rock ranging from fine powder to 3/8 inch. Compacts into a firm, permeable surface. Used for garden paths, xeriscaping, and patios. Available stabilized with resin binder for improved hardness. Density: ~1.35 tons/cubic yard. Needs edging to prevent spreading.
How does gravel depth affect drainage?
Clean angular stone without fines drains water at 15–20 inches per hour through a 4-inch layer. Crusher run with fines drains much more slowly. For drainage applications, always use clean stone. Minimum effective drainage depth: 4 inches. Deeper provides more stormwater storage capacity.
Can I use gravel as a mulch substitute?
Yes, especially for dry climates and xeriscape designs. Advantages: does not decompose, does not attract pests, does not wash away. Disadvantages: retains heat, does not improve soil fertility, and is difficult to remove once installed. Best used where a permanent, low-maintenance ground cover is desired.
What is landscape gravel vs construction gravel?
Landscape gravel prioritizes appearance — river rock, pea gravel, marble chips, lava rock. Construction gravel prioritizes structural performance — crushed stone, crusher run, processed aggregate. Decorative grades cost significantly more per cubic yard. Structural base layers should always use construction gravel.
How do I calculate gravel for a long driveway?
For a 200 ft × 12 ft driveway at 4 inches: CY = 200 × 12 × (4/12) ÷ 27 = 29.6 cu yd. With 10% waste = 32.6 cu yd. In tons (at 1.5 tons/cu yd) = 48.9 tons, requiring 3–4 dump truck loads. Request volume pricing above 25 cu yd.
What is river rock gravel used for?
River rock is smooth, rounded stone 1–5 inches in diameter. Used for decorative beds, dry creek beds, drainage swales, pool surrounds, and erosion control. Not suitable for driveways. Density: ~1.65 tons/cubic yard — heaviest common gravel type.
How do I prevent weeds in gravel?
Install heavy contractor-grade geotextile fabric beneath the gravel. Use adequate depth (3+ inches). Apply pre-emergent herbicide before installation in high-weed-pressure areas. Use fine-particle gravel like DG for denser surface coverage. Spot-treat emerging weeds before they seed.
Does this calculator work for all gravel types?
Yes — select your material type for the correct density conversion. The volume calculation (cubic yards) is identical for all materials. If your gravel type is not listed, use the custom density option and enter the tons-per-cubic-yard figure from your supplier's specifications.
How do I order gravel — by the ton or by the cubic yard?
Most bulk suppliers quote by the ton. Know both equivalents before calling so you can compare quotes in any unit. Ask whether prices are for dry or wet weight — wet stone can weigh 5–10% more. Typical delivery minimum is 10 tons or 7 cubic yards. For under 3 cubic yards, pickup in a trailer or buying bagged material may be more economical than paying the delivery fee on a small quantity.
What is the best gravel for a parking area?
For parking areas, use a compacted two-layer system: a 4-inch base layer of #3 or #4 crushed stone for structural support, topped with 2–3 inches of crusher run or ⅝-inch minus crushed stone as the wearing surface. Crusher run compacts into a near-solid surface under vehicle loads, resisting displacement far better than pea gravel or clean stone. For heavy vehicles (trucks, RVs), increase the base layer to 6 inches. A geogrid at the subgrade interface is recommended for soft or sandy soils to prevent base stone from sinking.
How do I calculate gravel for a retaining wall backfill?
Retaining wall drainage backfill uses clean crushed stone (typically #57 or #3 stone) directly behind the wall to prevent hydrostatic water pressure buildup. Calculate the backfill volume as: Wall Length × Backfill Width (typically 1–2 ft) × Wall Height × 0.5 (triangular taper factor for tapered backfill). For a 20 ft long × 3 ft tall wall with 18-inch backfill width: 20 × 1.5 × 3 × 0.5 = 45 cu ft ÷ 27 = 1.67 cu yd. Add 10–15% waste. The drainage layer must connect to a perforated pipe or weep holes to discharge collected water.
What gravel size works best under pavers or flagstone?
For paver or flagstone installations, use a two-layer base system: 4 inches of #57 crushed stone as the structural base layer, compacted in two 2-inch lifts, topped with 1 inch of coarse bedding sand or stone dust (not pea gravel). Stone dust — a byproduct of stone crushing — fills completely and compacts into a firm, stable bedding layer that holds pavers in position without shifting. Avoid pea gravel as bedding under pavers because its round particles never lock together and allow paver movement under foot traffic.
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