Gravel Driveway Math: The 2026 Guide to Cubic Yards, Tonnage, and Ordering the Right Amount

Gravel is sold by the ton, driveways are measured in feet, and depth lives in inches — which is why so many projects end with leftover stone or a delivery that quits eight feet from the garage. The bridge is short: area times depth gives cubic yards, and crushed stone converts at roughly 1.4 tons per cubic yard, plus compaction and honest waste on top. This guide walks the full chain — measuring, depth choice, the 324 divisor, density, the compaction allowance — then covers what arithmetic cannot see: layering against ruts, choosing stone sizes, surviving delivery day. A gravel driveway calculator at /gravel-driveway-calculator.html handles the conversions instantly, but the judgment calls are yours. Treat every figure here as a planning estimate; your supplier's scale ticket and local delivery minimums have the final say.

SECTION 01Volume First, Weight Second

Every gravel estimate starts as a volume problem, because the ground knows nothing about tons. You are filling a shallow prism: length times width times depth. The only trick is units, and the standard shortcut for imperial measurements is the 324 divisor — multiply your square footage by depth in inches, then divide by 324, and the result is cubic yards. The number works because one cubic yard spread one inch deep covers 324 square feet, which is just the yard-to-feet conversion (27 cubic feet per yard) with inches folded in.

So a 20-by-60-foot driveway — 1,200 square feet — at 4 inches deep is 1,200 times 4 divided by 324, about 14.8 cubic yards. Write that number down before thinking about tons, suppliers, or money, because volume is the quantity your site actually requires. Weight is a purchasing detail that depends on the material's density, and it comes next.

SECTION 02From Cubic Yards to Tons: The 1.4 Factor

Quarries sell crushed stone by weight, and the conversion factor is density: tons equal cubic yards times tons per cubic yard. Crushed limestone and similar aggregates run roughly 1.3 to 1.5 tons per cubic yard depending on the stone, the size mix, and moisture, and around 1.4 is the working number most estimators reach for. Our 14.8-cubic-yard example therefore converts to about 20.7 tons — call it 21 tons before allowances.

The factor is not fraud-proof precision; it is physics with a margin. A load of wet crusher run weighs more than the same volume of dry washed stone, and rounded decorative gravel sits differently in a bucket than angular crushed rock. Suppliers know their own product, so the professional move is to compute volume yourself, convert with 1.4 for budgeting, and confirm tonnage against the supplier's figure when you order. When the two disagree by more than about ten percent, ask what density they are using — it is a legitimate question that quarries answer without blinking.

SECTION 03Choosing Depth: What the Driveway Has to Carry

Depth is where driveways earn their longevity. A common residential recipe is 4 to 6 inches of compacted gravel for light car and SUV traffic on decent subsoil, 6 to 8 inches where heavy trucks, boats, or RVs will roll, and considerably more — sometimes 8 to 12 inches in layers — over soft clay or boggy ground. The depth carries the load down to the subgrade, so weak ground demands thicker structure, exactly the way a snowshoe works.

Resist the temptation to thin the order to save money, because thin gravel fails in the most annoying way: it does not fail all at once, it develops ruts and potholes in the wheel paths each spring, and the annual patching costs quietly exceed the original savings. Also account for what exists already — topping up an old driveway needs only the worn depth, while a fresh-cut path through soil needs the full section. Measure the actual low spots with a straightedge rather than trusting memory.

SECTION 04The Compaction and Waste Allowance

Here is the detail that separates accurate orders from short ones: gravel compacts. Loose stone dropped from a truck settles under traffic and rolling, typically consolidating by somewhere around 10 to 20 percent depending on the material and how hard it is compacted. If you order exactly the finished volume, the driveway ends up thin. Practical estimators either add that percentage to the order or, equivalently, order loose depth exceeding the compacted target.

Waste piles on top of compaction: spreading losses to the edges, stone pressed into soft mud at the entrance, a bit scraped off by the loader, and the undrivable last quarter-ton in the pile. A combined allowance of 10 to 20 percent over the calculated tonnage is the common hedge — our 21-ton example becomes an order of roughly 23 to 24 tons. Do not double-count, though: if you calculated from compacted depth, add the allowance once, and if your supplier prices partial loads oddly, rounding up to the next full ton is usually cheaper than a second delivery fee.

SECTION 05Building a Driveway in Layers

Quality gravel driveways are layered, not poured. The classic structure starts with larger angular base stone — the big, interlocking pieces often called crusher run or road base, which bind with fines to lock into a stable mass — followed by a middle lift of the same or slightly smaller material, finished with 2 to 4 inches of a smaller, cleaner stone like #57 for the driving surface. Each layer is spread and compacted before the next goes down, with the total section matching whatever depth your traffic and subgrade demanded.

The layering matters for your math in one specific way: calculate each layer by its own depth rather than averaging. A 1,200-square-foot driveway with 4 inches of compacted base plus 2 inches of finish stone is 14.8 cubic yards of base plus about 7.4 cubic yards of finish — roughly 21 and 10 tons respectively before allowances — and those two products usually come from different piles at different prices. Suppliers quote base and finish stone differently, and your budget should reflect that instead of discovering it on delivery day.

SECTION 06Stone Sizes, Costs, and Delivery Realities

Stone sizing jargon is numbered, and the numbers shrink as the stone gets bigger: #57 (around three-quarters inch to an inch) is the ubiquitous finish gravel; #4 and similar larger sizes serve as base and mud-relief layers; crusher run mixes fines with crushed faces and is the workhorse of driveways that need to lock. Angular stone always outperforms rounded pea gravel for driveways because the sharp faces interlock instead of rolling — pretty pea gravel is for paths, not parking.

Costs land in two parts: material and delivery. Regional prices for common aggregates often run somewhere in the tens of dollars per ton — call it 20 to 60 depending on where you live and what you choose — so our 21-to-24-ton order might land anywhere from a few hundred dollars to well over a thousand delivered. Trucks have practical limits too, commonly somewhere around 10 to 20+ tons depending on the rig and local road rules, so big orders may arrive in two loads with two spread fees. Price the whole truth at the supplier, then run your numbers at /gravel-driveway-calculator.html and compare.

SECTION 07Spreading, Grading, and Aftercare

Delivery day goes better with a plan: dump locations agreed in advance, a skid steer or tractor-line rental (or a very good wheelbarrow), and a grade that sheds water — a crowned driveway, higher in the middle, drains itself; a flat or bowl-shaped one collects the potholes you are trying to avoid. Spread in lifts of a few inches, compact each with a plate compactor or the tires of a loaded truck, and keep the crown consistent the whole length.

Aftercare is cheaper than rebuilding: fill potholes when they are small, refresh the finish layer every few years with a 1-to-2-inch top-dress (a small order by driveway standards), and keep edges edged so the stone stays where you spread it. A well-built gravel driveway is one of the cheapest per-foot surfaces you can own precisely because its maintenance is periodic rather than structural — and because you did the volume math once, correctly, with a calculator and a little compaction humility.

SECTION 08The Chain Every Example Follows

Every scenario uses the same four steps. One: area, from measured length times width in feet. Two: volume, area times depth in inches divided by 324, giving cubic yards. Three: tonnage, cubic yards times roughly 1.4 tons per cubic yard for typical crushed stone. Four: the order, tonnage plus a 10-20 percent allowance for compaction and waste, rounded to a sensible order size.

Keep the two rounding moves separate. Rounding the arithmetic to one decimal is fine; rounding the order happens once, at the end, and usually upward because the second truck trip costs more than the extra half ton. And when a scenario uses two different stones, each layer gets its own four-step chain — averaging across products is how budgets get surprised.

SECTION 09Scenario 1: Refreshing a 1,200 Square Foot Driveway to 4 Inches

A 20-by-60-foot driveway that has thinned over the years; the plan is a rebuilt 4-inch compacted section in crusher run. Volume: 1,200 times 4 divided by 324, which is 14.8 cubic yards. Tonnage: 14.8 times 1.4, about 20.7 tons. With a 15 percent allowance for compaction and waste, the order is about 23.8 — call it 24 tons.

Sanity checks: 24 tons is a serious delivery, likely one large truck or two smaller ones, and at typical regional pricing of a few tens of dollars per ton the material lands in the several-hundred-dollar range before delivery. The math also says why thin top-ups tempt people — but 4 inches exists to carry the load, and this scenario assumed the old base is gone. If a sound 3 inches remains underneath, the honest order shrinks by a quarter; measure, do not hope.

SECTION 10Scenario 2: New Driveway, 12 by 50 Feet at 6 Inches

A fresh cut along the side of a property: 600 square feet of bare subsoil that needs the deeper section, so 6 inches of compacted crusher run. Volume: 600 times 6 divided by 324, which is 11.1 cubic yards. Tonnage: 11.1 times 1.4, about 15.6 tons. Add 15 percent: 17.9 — round to 18 tons.

The interesting part of new construction is not the arithmetic, it is the ground. Soft or clay-heavy subsoil may justify 8 inches or a stabilizing layer of larger stone first, in which case the base chain reruns at the new depth — 600 times 8 over 324 is 14.8 yards, about 21 tons, plus the finish layer on top. Geotextile fabric under a new driveway is cheap insurance that also reduces how much stone disappears into the mud, which is itself a form of waste allowance.

SECTION 11Scenario 3: Top-Dressing 1,000 Square Feet at 2 Inches

Annual-style maintenance: the surface has ruts and thin spots but the base is sound, so a 2-inch refresh of #57 finish stone over 1,000 square feet. Volume: 1,000 times 2 divided by 324, which is 6.2 cubic yards. Tonnage: 6.2 times 1.4, about 8.6 tons; with 10 percent allowance (compaction is milder on a thin top-dress), call it 9 to 10 tons.

This is the scenario where ordering discipline pays most, because top-dress stone is the most likely to be over-ordered by eye. Two inches sounds trivial until you price it; conversely, suppliers often have delivery minimums, so the real decision may be between a slightly heavy single load now and splitting into two deliveries later. Spreading nine tons by hand is a solid weekend — renting a small skid steer or hiring the spreading out is often worth more than any calculator refinement.

SECTION 12Scenario 4: A 30 by 30 Parking Pad at 5 Inches

A parking area off the driveway: 900 square feet, cars plus occasional delivery trucks, so 5 inches of compacted crusher run. Volume: 900 times 5 divided by 324, which is 13.9 cubic yards. Tonnage: 13.9 times 1.4, about 19.4 tons; with 15 percent, the order is about 22.3 — call it 22 to 23 tons.

Note how fast flat areas eat tonnage: a 900-square-foot pad is three-quarters of Scenario 1's 1,200-square-foot driveway but needs two-thirds less length to serve. Parking pads also concentrate the drainage lesson — a crowned or slightly sloped pad sheds water, while a low corner becomes a stone-eating mud pit every winter. If the pad sits where water stands, add depth or fabric before adding stone; the calculator handles depth, not hydrology.

SECTION 13Scenario 5: Layered Build — Base Plus Finish on 1,200 Square Feet

The full treatment on our standard 1,200-square-foot drive: 4 inches of compacted base (crusher run) plus 2 inches of #57 finish stone, calculated separately. Base: 1,200 times 4 over 324 is 14.8 yards, about 20.7 tons, plus 15 percent for roughly 24 tons ordered. Finish: 1,200 times 2 over 324 is 7.4 yards, about 10.4 tons, plus a milder 10 percent for about 11 to 12 tons.

Total: about 35 to 36 tons across two products — and two prices, since base stone and washed finish stone rarely share a rate. The layered result also illustrates why single-number estimates mislead: a naive 6-inch average calculation gives 22.2 yards, about 31 tons, which looks reasonable but hides that you are buying two materials in a 2-to-1 ratio. When layers differ in price per ton meaningfully, run each layer through the calculator at /gravel-driveway-calculator.html and add the orders, not the depths.

SECTION 14Scenario 6: Pricing the Order Against a Real Quote

Take Scenario 1's 24-ton order and price it against a supplier quoting 28 dollars per ton for crusher run with 90 dollars delivery. Material: 24 times 28 is 672 dollars; add delivery and the job is about 762 dollars. A competing quote at 24 dollars per ton but 250 dollars delivery works out to 826 dollars — the cheaper per-ton quote loses once the truck is paid for.

That comparison is the entire business case for knowing your tonnage before calling anyone: quotes are only comparable when your quantity is fixed. Ask each supplier the same three questions — price per ton delivered, the density their quote assumes, and truck capacity per load. Then order with the compaction margin already included, because the cheapest gravel is the gravel you only haul once. Re-run any quote against your volume at /gravel-driveway-calculator.html and let the scale ticket be the final word.

SECTION 15What the Numbers Cannot See

Every example above assumed honest subgrade, sane drainage, and stone that matches its description. Real sites add mud, hidden stumps, a soft spot at the road apron where water runs, and the occasional delivery truck that cannot quite reach where you wanted the pile. The allowance percentage is your buffer for site reality, not just compaction physics — soft ground eating stone is a real and recurring tonnage sink.

The other invisible is labor: nine tons hand-spread is a day; thirty-five tons is equipment or a contractor. Pricing both paths before ordering turns an estimate into a project plan. Measure the actual depths where the driveway is worst, not the average, because ruts define the minimum; the arithmetic above is exact, but the tape measure decides which numbers go into it.

SECTION 16Mistake 1: Mixing Up Yards, Tons, and Bags

The foundational error is treating cubic yards and tons as interchangeable, or worse, doing the math in one unit and ordering in the other. A 20-cubic-yard driveway described as 20 tons leaves nearly eight tons short with a 1.4-density stone; a 28-ton order described as yards overshoots by a third. Bags compound the confusion — one 0.5-cubic-foot bag is a rounding error against a multi-ton job, and bag pricing per yard is often triple bulk.

The fix is a written chain with units at every step: square feet to cubic yards (the 324 divisor), yards to tons (density around 1.4 for crushed stone), tons to order (plus the allowance). Say the units out loud when you call the supplier — experienced dispatchers catch unit mix-ups daily, but only if the customer gives them something to catch. Ten seconds of discipline prevents the classic short-driveway-in-April phone call.

SECTION 17Mistake 2: Skipping the Compaction Allowance

New gravel compresses. Loose-dumped stone consolidates under rolling and traffic, commonly around 10 to 20 percent, which means an order computed exactly to finished depth finishes thin — and a thin driveway is a rutted driveway on schedule. The second-order mistake is double-counting: inflating depth and adding allowance on top, which overshoots and leaves a berm of extra stone by the garage.

The fix is to add the allowance exactly once, at the order step, and to know which depth you calculated from. If your 4 inches is the compacted target, the order is about 15 percent more than the raw tonnage; if you deliberately calculated at 5 inches of loose stone, the compacted result lands near 4 and no further padding is needed. Write down which convention you used — this is the single most common reason a well-measured order disappoints.

SECTION 18Mistake 3: Patching Potholes Over a Failing Base

The endless-spring ritual: fill the pothole, drive on it, watch it reappear by June. The cause is usually underneath — a base that was too thin or too rounded from the start, or saturated subgrade pumping mud up through the stone. Potholes are a symptom; adding finish stone to one is maintenance theater, and a decade of it can quietly exceed the cost of rebuilding the section properly.

The fix is diagnosis before tonnage: dig or probe one pothole and look. If the base is sound but thin, a full-width top-dress computed honestly (2 inches over 1,000 square feet is roughly 9-10 tons ordered) fixes it. If the base is the problem, cut out the soft section, deepen it, add fabric or larger stone, and rebuild — local surgery, not annual cosmetics. Fix the water that made the mud while you are there, or the surgery is temporary too.

SECTION 19Mistake 4: The Wrong Stone in the Wheel Path

Rounded stone — pea gravel, river rock — belongs in garden beds, not driveways. Round faces cannot interlock, so traffic squirrels it aside, tires spin, and the stone migrates onto lawns and into tire treads. The same logic condemns huge decorative rock as a driving surface. Meanwhile, the opposite mistake exists too: piling fine crusher run as the top layer everywhere and wondering why it tracks into the house and turns to porridge in rain.

The fix is matching product to layer: angular, fines-containing crusher run for structure and base; a clean, angular, mid-size stone like #57 for the surface it compacts into and drains through. If the supplier sells by name rather than number, describe the job — base under a driveway versus a walking-friendly finish — and let them pick from what actually performs in your region. Purchase the structure the surface deserves.

SECTION 20Mistake 5: Ignoring Drainage and Crown

Water is the gravel driveway's main adversary, and it wins through flatness. A drive with no crown holds rain, softens the subgrade, and turns every wheel path into a rut factory; a drive that dumps runoff onto a neighbor's lot or across a public walk creates a different category of problem entirely. Driveways built dead-level between ditches become mud canals, and no quantity of stone permanently fixes a bathtub.

The fix is geometry, not gravel: shape a crown — often a few percent slope from centerline to edge — or grade the whole surface toward a ditch, and keep culverts clear where the drive crosses drainage. Address low spots with fill rather than stone, because water standing on stone is stone being consumed. This is where a bit of grading work on delivery day earns more than a few extra tons ever will.

SECTION 21Mistake 6: Ordering and Delivery Day Errors

Common order-day mistakes: forgetting to confirm which density the quote assumes, ignoring truck access (a full-size dump needs real clearance and firm ground to stand on while tipping), and ordering during the spring rush without a delivery window. The expensive version is the return trip — a second minimum load or second delivery fee for the two tons the first order lacked.

The pro pattern is a short checklist: tonnage computed and allowance included; product and size named; density, price per ton delivered, and truck capacity confirmed; dump location walked and marked; and a rake, plate compactor rental, or operator lined up for the same week. Confirm that the driver can spread or that you can reach the pile from both ends. Every item is a five-minute task, and together they eliminate most of the ways delivery day goes sideways.

SECTION 22Pro Habits and a Quick Reference

Experienced owners keep a driveway log: date, tons, product, and what failed each year. Patterns emerge — the same low spot every winter, the apron that eats stone — and the log converts gut feelings into targeted fixes. They also re-grade annually, crown-check after winter, and top-dress on schedule rather than waiting for complaints from the suspension.

The mental toolkit is small: the 324 divisor for volume, about 1.4 tons per cubic yard for typical crushed stone, a 10-20 percent allowance added once, and the layering logic of base-under-finish. With those four facts and a tape measure, you can estimate any gravel job in five minutes and check any quote in two. The calculator at /gravel-driveway-calculator.html runs the numbers; the habits above keep them honest.

🔑 Key takeaways

• Volume first: square footage x depth in inches / 324 = cubic yards (1,200 sq ft at 4 inches is about 14.8 cubic yards).
• Convert with density: crushed stone runs roughly 1.4 tons per cubic yard (typically 1.3-1.5 depending on material and moisture).
• Add 10-20 percent for compaction and waste — compacted gravel settles, and short orders cost a second delivery fee.
• Match depth to traffic and subgrade: commonly 4-6 inches for cars, 6-8 for trucks and RVs, more over soft ground.
• Calculate layers separately — base and finish stone are different products at different prices.
• Angular crushed stone interlocks; rounded pea gravel rolls and belongs in paths, not driveways.
• Confirm the supplier's density and truck limits when ordering; the scale ticket is the final arbiter.
• The chain: sq ft x inches / 324 = cubic yards; yards x ~1.4 = tons; order = tons + 10-20 percent.
• 1,200 sq ft at 4 inches: 14.8 cubic yards, about 21 tons, order roughly 24 with allowance.
• New construction on soft ground may need 8 inches or a stabilizing base layer — rerun the chain per layer.
• Thin top-dresses (2 inches over 1,000 sq ft is about 9-10 tons ordered) are the most over-ordered job by eye.
• Layered builds are separate orders: 4 inches base plus 2 inches finish on 1,200 sq ft is about 24 tons base plus 11-12 tons finish.
• Delivery fees flip rankings: a 28/ton quote with 90 delivery beat a 24/ton quote with 250 on a 24-ton order.
• Fix the quantity before collecting quotes; the supplier's density and truck size are part of the price.
• Keep units explicit at every step: square feet to cubic yards (divide by 324), yards to tons (about 1.4), tons to order (plus allowance once).
• Gravel compacts — add 10-20 percent at the order step, not by inflating depth, or you will double-count.
• Potholes are symptoms; probe one before buying stone. Thin bases get top-dresses, failed bases get surgery.
• Angular stone for structure and surface; rounded pea gravel belongs in beds, not wheel paths.
• Shape the crown or slope before spreading — drainage geometry outperforms extra tons.
• Confirm density, delivered price, truck capacity, and dump location before the truck rolls.
• Log every order and failure pattern; annual grading plus scheduled top-dresses beat reactive patching.

❓ Frequently asked questions

How many tons of gravel do I need for a driveway?

Compute cubic yards (square footage x depth in inches / 324), then multiply by about 1.4 tons per cubic yard, then add 10-20 percent for compaction and waste. A 1,200 sq ft driveway at 4 inches is about 14.8 cubic yards, roughly 21 tons, so an order of 23-24 tons is a sensible plan.

How many cubic yards are in a ton of gravel?

For typical crushed stone, one ton is roughly 0.7 cubic yards (the inverse of about 1.4 tons per yard). The exact figure depends on the stone — dense limestone runs heavier, lighter volcanic or slag aggregates run lighter — so use your supplier's stated density when precision matters.

How deep should a gravel driveway be?

Common residential guidance is 4-6 inches of compacted gravel for cars and light trucks on firm subsoil, 6-8 inches for heavy vehicles, and thicker layered sections over soft clay. Depth is the structure that carries load to the ground, so soft or wet soil deserves more, not less.

Do I need to order extra gravel for compaction?

Yes. Loose stone typically consolidates around 10-20 percent when compacted and trafficked, so ordering exactly the finished volume leaves the driveway thin. Add the allowance once, on top of a small waste margin, or order loose depth above your compacted target.

What is the difference between crusher run and #57 stone?

Crusher run is a mix of crushed stone and fines that compacts into a tight, load-bearing base — the workhorse for the layers under the surface. #57 is a washed, roughly three-quarter-inch stone with the fines removed; it drains well and makes a clean driving surface but does not lock like crusher run. Most good driveways use both, in that order.

How much does a gravel driveway cost?

Material for common aggregates often runs somewhere around 20-60 dollars per ton regionally, plus delivery. A 1,200 sq ft driveway at 4 inches needing roughly 21-24 tons might land anywhere from several hundred to over a thousand dollars depending on stone choice and haul distance. Get a per-ton delivered quote and multiply by your own tonnage estimate.

How much gravel is in a cubic yard?

A cubic yard is 27 cubic feet — enough to cover 324 square feet at one inch deep, or 54 square feet at six inches. In weight terms, typical crushed stone runs about 1.3 to 1.5 tons per cubic yard, which is why the 1.4 working factor appears in most estimates.

How do I calculate tons of gravel from square feet?

Multiply square footage by depth in inches, divide by 324 to get cubic yards, then multiply by the material's tons-per-yard (about 1.4 for crushed stone). Add 10-20 percent for compaction and waste before ordering. For 900 sq ft at 5 inches: 13.9 yards, about 19.4 tons, order roughly 22-23.

Should I buy gravel by the yard or by the ton?

Suppliers sell by weight, so tonnage is what appears on the invoice — but compute volume first, because the site needs volume and density is just the exchange rate. Buying by the bag only makes sense for tiny patch jobs; anything over a couple of tons is far cheaper in bulk deliveries.

How much extra should I order for compaction?

A combined 10-20 percent over the calculated tonnage covers both compaction (loose stone typically settles around 10-20 percent) and spreading waste. Thin top-dresses can stay at the low end; fresh builds on soft ground should lean high. Add the allowance once — do not also inflate the depth.

Can I spread a gravel driveway myself?

A few tons spread with a rake and wheelbarrow is a firm weekend project; 20 or more tons wants a compact tractor, skid steer rental, or the supplier's spreading service. Whatever moves the stone, compact it in lifts and keep a crown for drainage — the spreading method affects the workout, not the tonnage.

Why did my gravel order run short?

The usual suspects: depth measured at the high spots instead of the ruts, no compaction allowance, stone disappearing into soft subgrade, and spreading losses at the edges. A site that ate its first order usually needs depth or geotextile fabric, not just more stone — fix the cause before topping up.

How many tons of gravel do I need for a 1,000 square foot driveway?

At 4 inches: 1,000 x 4 / 324 is about 12.3 cubic yards, times roughly 1.4 is about 17.3 tons, so order around 19-20 with the compaction and waste allowance. At 2 inches for a top-dress, the same area needs only about 9-10 tons ordered.

Why does my gravel driveway keep getting potholes?

Because something under the surface is failing: usually a thin or rounded-stone base, saturated subgrade with poor drainage, or all three. Filling potholes without fixing the base and the water is annual maintenance theater. Probe a hole, check the crown, and rebuild the weak section with proper angular base stone.

Should I use landscape fabric under my gravel driveway?

Geotextile fabric is cheap insurance over soft or muddy subgrade: it separates stone from soil, stops stone from sinking in, and effectively reduces the tonnage the mud consumes. Over firm, well-drained ground it is less critical. New builds on clay or wet sites are the classic case for it.

How often should I add gravel to my driveway?

Well-built driveways commonly need a 1-2 inch finish-layer refresh every few years, sooner where water or heavy vehicles work the surface. If you are adding more than that annually, the base or drainage is the real problem. Keep a log of dates and tonnages so the pattern is visible.

What size gravel is best for a driveway?

The common recipe is angular crusher run (stone with fines) for the base layers, compacted, topped with 2-4 inches of a clean angular stone around three-quarters of an inch (#57) for the surface. Bases for heavy vehicles use larger angular stone underneath. Avoid rounded stone in any layer that carries wheels.

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