About the site
About Driveway Calculator
Driveway-Calculator.com is a free, independent tool site with one driving question: how much gravel does this driveway really need? We answer it with compacted-density formulas, a two-layer base-and-top system, honest waste factors, and a five-material cost comparison — not with a single confident-sounding guess.
11
gravel & aggregate types
5
driveway materials compared
3
area shapes supported
0
accounts required
Why we built this
Every driveway project starts the same way: a homeowner or contractor stares at a bare patch of dirt and asks, 'How much gravel does this actually take?' The answers are everywhere — a neighbor who put in a driveway last summer swears by 6 inches of 'good stuff,' a Google result says 10 cubic yards for a 'typical two-car drive,' a contractor quotes $8,000 without breaking down what that covers. Meanwhile, the consequences of guessing wrong are concrete: a half-empty delivery truck on your lawn, a second trip that doubles the hauling fee, or a driveway that washes out after the first heavy rain because you used pea gravel for the base layer.
The tools that existed tended to stop at the easiest multiplication. Type length and width, get square feet, done. But real driveway decisions start after that number: what density is your gravel, how much does it compact, what is the difference between a base layer and a top layer, and why does every aggregate supplier quote prices differently? We built this site so those questions get answered in one pass — with the density formulas visible, the layer depths adjustable, and the waste factor doing what it actually does on a real jobsite.
We are also deliberate about what this site is not. It is not a lead-generation funnel pretending to be a calculator, and it is not a gravel yard dressing up product pages as advice. It is a focused reference tool: one two-layer gravel engine, maintained carefully, surrounded by guides that explain why ABC compacts harder than pea gravel, why geotextile matters on clay soil, and why that extra inch of depth costs $200 upfront but saves $2,000 in 10 years. Everything runs free, in your browser, with no account — because an estimator you have to register for is an estimator most people will never finish using.
What the site covers, in three layers
Everything here hangs off one core gravel engine, but a driveway project has three distinct phases: working out the volume and weight, comparing material costs, and planning the extras that contractors quote but DIYers forget.
The core math
Calculate
One engine, three area shapes, two independent gravel layers. Volume comes from area × depth ÷ 12; weight comes from volume × compacted density per ASTM D448; cost comes from volume × supplier price. Every intermediate number — base volume, top volume, total tonnage, bag counts — sits next to the inputs that produced it.
Run an estimate →Five materials side by side
Compare
Gravel, asphalt, concrete, interlocking pavers, and stamped concrete — all installed cost ranges with low/mid/high pricing and expected lifespan. Same square footage, same assumptions, zero cherry-picking. The question is not 'which is cheapest today' but 'which costs less per year over 30 years.'
See the comparison tools →Beyond the material
Plan
Site prep, old driveway removal, permits, apron and culvert, grading, drainage — every line item that contractors quote but DIYers forget. Toggle them on and the total flips from a gravel price to a real project budget you can build against.
Browse the guides →Inside the calculator: how an estimate is built
The core equation is printed on the homepage and never changes: Volume (cu yd) = (Area × Depth) ÷ 324. Everything else exists to feed that equation better inputs — compacted densities, correct layer selection, and a waste factor that actually represents what happens on a real driveway. Here is the chain, step by step.
| Gravel type | Compacting density | Default price | Best use |
|---|---|---|---|
| ABC / Crusher Run | 140 lbs/ft³ | $20 / cu yd | Aggregate Base Course — well-graded with fines, compacts to a hard surface. The gold standard base layer. |
| CA6 / 21AA / Class 5 | 135 lbs/ft³ | $24 / cu yd | State-specified dense-graded base with clay binder for frost-prone areas and premium installations. |
| #57 Crushed Stone | 160 lbs/ft³ | $40 / cu yd | 1–1.5 inch angular clean stone with no fines. Top surface layer, excellent drainage. |
| Pea Gravel | 108 lbs/ft³ | $35 / cu yd | 3/8-inch smooth rounded river gravel. Decorative only — cannot handle concentrated wheel loads. |
| Decomposed Granite (DG) | 130 lbs/ft³ | $48 / cu yd | Fines to 1/4-inch particles that pack hard. Premium surface layer with a natural look. |
| River Rock | 95 lbs/ft³ | $85 / cu yd | 1–6 inch smooth rounded stones. Decorative drainage only, extremely low density. |
Inputs we sharpen for you
- Compacted vs loose density — every gravel type uses compacted density from ASTM D448, not loose. Loose gravel compacts 10–15% less volume once driven on.
- Two independent layers — base layer (4 inches ABC) and top layer (2 inches #57) each get their own material selection and depth. Not one thick layer of mixed stone.
- Area shape — rectangle, circle, or triangle. Turnarounds are circles, flares at the street are triangles, and most driveways are rectangles.
A worked example you can verify
- 20 × 40 ft rectangle = 800 sq ft area.
- Base layer: 4 inches ABC = 800 × 0.333 = 266.4 cu ft = 9.87 cu yd.
- Base weight: 266.4 × 140 lbs/ft³ = 37,296 lbs = 18.65 US tons.
- Top layer: 2 inches #57 = 800 × 0.167 = 133.6 cu ft = 4.95 cu yd.
- Top weight: 133.6 × 160 lbs/ft³ = 21,376 lbs = 10.69 US tons.
- Total with 10% waste: (9.87 + 4.95) × 1.1 = 16.31 cu yd, 32.2 US tons.
Metric mode mirrors the entire chain in meters, cm, m³, and metric tonnes, with densities converted to kg/m³.
Who it is for
A planning tool succeeds when it fits the person holding the measuring tape. These are the four groups we design for — the calculator serves all of them with the same formulas and the same honest math.
DIY homeowners
Putting in a gravel driveway on a weekend budget. You get the exact cubic yards, the tonnage your truck needs to haul, and the bag counts if you are doing it by hand — before you rent a compactor or order a dump truck.
Landscapers & hardscapers
Turnover schedules live on accurate takeoffs. The two-layer system with independent depth and material selection lets you quote base and top separately, and share links carry the exact inputs for every driveway on the job.
Contractors & estimators
You know the difference between ABC and CA6, but you need a tool that reflects that knowledge — not a dumbed-down gravel calculator that treats all stone the same. Species density, compacted volume, material comparison, extra work costs — everything in one pass.
Architects & designers
Preliminary site plans need defensible material budgets. Share links carry length, width, shape, layer depths, gravel types, and waste percentage — so clients and contractors see the same numbers, not a verbal estimate.
Where our numbers come from
A calculator earns trust by showing its receipts. These are the sources behind every density, gradation standard, and price point in the tool — and the process that keeps them current.
ASTM D448 aggregate density specifications
All compacted gravel densities (140 lbs/ft³ for ABC, 160 lbs/ft³ for #57 crushed stone, 108 lbs/ft³ for pea gravel, and so on) follow ASTM D448, the standard aggregate bulk density test method that every state DOT references for roadway base materials.
AASHTO M147 gradation standards
The well-graded base materials — ABC, CA6, Class 5 — use AASHTO M147 gradation bands. The difference between a well-graded base and clean stone (no fines) is the single most important distinction in this calculator, and it comes directly from these standards.
Regional aggregate price reports
Material-only reference prices ($20/cu yd for ABC, $40/cu yd for #57, $85/cu yd for river rock, etc.) are national averages sourced from quarterly pit and quarry price reports across the US and Canada — starting points you replace with your local yard's quote.
Corrections from tradespeople
Several gravel density defaults on this site have been sharpened by feedback from landscapers, aggregate yard managers, and geotechnical engineers who sent published spec sheets. Every formula and price figure carries an invitation: if you have a source that disagrees, send it through the contact page.
How we work
Five working rules that decide what ships on this site — and what gets sent back for another pass.
- 01
Compacted density, not loose
Every calculation uses compacted densities — a gravel driveway compacts to about 85–90% of its loose volume once driven on. Calculating with loose density understates tonnage by 10–15% every single time.
- 02
Two layers, not one
A proper driveway uses a load-bearing base (ABC/CA6, 4 inches) and a decorative surface (#57/pea gravel, 2 inches). One thick layer of mixed stone won't compact well and will shift under traffic. Our engine models them independently.
- 03
Waste is not optional
10% minimum waste covers compaction settling, spillage, thin spots after rain, and supplier rounding to full cubic yards. Curved driveways and sloped sites need 15%. You won't regret having a small pile of leftover gravel for touch-ups.
- 04
Show the formula
Volume = Area × Depth ÷ 12, Weight = Volume × Compacted Density, Tonnage = Weight ÷ 2000. Every formula sits next to the result it produces, so an estimate is auditable at a glance — not a magic number from a black box.
- 05
Materials, not marketing
If river rock costs more than pea gravel because its density is lower (you need more volume for the same depth), we show that math. If geotextile fabric is the single best upgrade for clay soil, we say so — even though we sell neither.
The site at a glance
The practical facts, without scrolling: what it costs, what we store, and how your data is handled. The longer versions live in the privacy policy and terms of service.
- Cost
- Free. No accounts, subscriptions, or paywalled results.
- Where it runs
- Entirely in your browser — inputs and saved results never leave your device.
- Units
- US (feet, inches, cubic yards, US tons) and Metric (meters, cm, m³, metric tonnes) fully mirrored.
- Saved results
- Stored in your browser's local storage only; erasing them takes one click and leaves no copy with us.
- Sharing
- Every calculation encodes into the page URL — bookmark it, text it, or hand it to the aggregate yard.
- Advertising
- May appear on the site, but never influences formulas, densities, or calculator behavior.
What's next
The two-layer gravel engine stays the flagship, but the same logic — compacted densities, independent layer selection, honest waste factors — is being extended to the rest of a driveway project. Nothing ships until its math is verified against industry standards and real aggregate supply practices.
🏞️Slope & drainage factorPlanned
Account for sloped driveways — steeper grades need more depth and different gravel types to resist washout. Drainage swale integration coming.
🧵Geotextile & fabric estimatorPlanned
Calculate fabric square footage for base layer separation — woven vs non-woven types, overlaps, and seam allowances.
📦Delivery truck matchingPlanned
Match total tonnage to the right truck size — single-axle, tandem, or tri-axle — and show hauling cost per trip.
🎲Side-by-side waste scenarioPlanned
Run 10% vs 15% vs 20% waste simultaneously to see exactly how each tier changes tonnage, cost, and delivery trips.
Questions people ask about this site
Who is behind Driveway-Calculator.com?
A small team of landscapers, hardscapers, and web builders who kept needing the same tool and never found one that showed its work. We maintain the calculator, write the guides, and read every correction that arrives through the contact page. There is no gravel yard, retail chain, or affiliate network behind the site — that independence is what lets the numbers stay honest.
How accurate are the density calculations?
Accurate enough to buy from, if you treat them as planning figures. The compacted densities come from ASTM D448 — the standard every state DOT uses for roadway base materials. The variance comes from your specific gravel (moisture content, crusher settings, gradation) and your specific compaction effort. We surface every assumption next to its result and remind you to verify densities with your local yard.
Why does the site cover guides if the calculator is the product?
Because a cubic-yard number without context is fragile. Knowing why ABC compacts to 140 lbs/ft³ while pea gravel compacts to 108, why you need geotextile on clay soil, and why the base layer and top layer must be compacted separately tells you when to override a default, when to add waste, and when a number deserves a second look. The guides make the calculator's outputs defensible instead of magical.
How often is the reference data reviewed?
Density values are ASTM standards that do not change. Material pricing is reviewed quarterly against regional aggregate price reports and whenever a reader sends a published source that disagrees with a figure on the site. Waste-factor defaults get refreshed annually against trade practice surveys from landscaper and hardscaper trade groups.
Ready to size up your driveway?
Enter a length and width, pick two gravel layers, and get cubic yards, tonnage, bag counts, and a five-material cost comparison in one pass.