Planning a new or resurfaced country driveway? Figuring out how much stone to order feels tricky at first. However, a simple driveway gravel calculator approach makes it straightforward. In this guide, we walk rural Kingston and Frontenac County property owners through the numbers, the right base and surface depths, and what a load of gravel actually costs.
We have built and rebuilt hundreds of driveways across the local area over 20-plus years. So we know what holds up on a long lane and what turns into potholes by spring. Let’s get into it.
Why a Driveway Gravel Calculator Matters
Order too little gravel and you get a thin surface that ruts and washes out. Order too much and you pay for material you cannot use. A quick driveway gravel calculator saves you both headaches.
Rural driveways take a beating here. Frost heaves the ground each winter. Heavy rain runs off the fields. Because of that, a proper compacted base matters far more than a pretty top layer.
In short, good math up front means fewer repairs later. That is money in your pocket.
The Two Layers Every Good Driveway Needs
A solid gravel driveway is not one big pile of stone. It is two layers, each doing a different job.
- Granular B (the base): Larger, coarser stone. It carries the load and drains water away from the surface.
- Granular A (the top): Smaller, crushed stone with fines. It locks together, compacts tight, and gives you a smooth driving surface.
You lay Granular B first, compact it, then add Granular A on top and compact again. This layering is the difference between a driveway that lasts a decade and one that fails in two years.
Want the full breakdown of stone options? Read our guide to driveway gravel types before you order. It explains where each product fits best.
Recommended Depths
Depth depends on your soil and how much traffic the driveway sees. That said, here are the depths we use most often on rural jobs.
- Granular B base: 150 to 200 mm (6 to 8 inches) after compaction.
- Granular A surface: 75 to 100 mm (3 to 4 inches) after compaction.
For a firm, well-drained subgrade, the lower end works fine. However, soft, wet, or clay-heavy ground needs more. On those sites, we often add a woven geotextile fabric under the base and bump the Granular B up to 250 mm or more.
Because compaction shrinks loose stone, always order a little extra. We plan for roughly 20 to 25 percent shrinkage between loose and compacted material.
How to Do the Driveway Gravel Calculator Math
Here is the simple version anyone can run at the kitchen table. You need three numbers: length, width, and depth.
Work in metres for the easiest math. Follow these steps.
- Measure length and width of the driveway in metres.
- Convert your depth from millimetres to metres (for example, 150 mm = 0.15 m).
- Multiply all three: length × width × depth = cubic metres of gravel.
- Repeat for each layer because Granular A and Granular B have different depths.
- Add the layers together for your total volume.
To convert cubic metres to tonnes, multiply by roughly 2.1, since a cubic metre of compacted granular weighs about 2.1 tonnes. Most local suppliers, including us, sell and deliver by the tonne.
A Worked Example
Say you have a country driveway 60 metres long and 3.5 metres wide. Here is how the numbers shake out.
- Base (Granular B) at 0.15 m: 60 × 3.5 × 0.15 = 31.5 cubic metres.
- Surface (Granular A) at 0.075 m: 60 × 3.5 × 0.075 = 15.75 cubic metres.
- Total volume: about 47 cubic metres.
Now convert to tonnes: 47 × 2.1 ≈ 99 tonnes. Add a bit for compaction and edge spillage, and you would order roughly 110 to 120 tonnes.
That is a fair amount of stone for a long lane. So delivery planning matters, which we cover below.
How Soft or Clay Subgrades Change the Spec
Not every yard sits on firm ground. Many rural properties around Frontenac County have low, wet spots or heavy soils that hold water.
On soft ground, gravel sinks and disappears if you skip the prep. Because of that, we usually do a few extra things.
- Strip out soft topsoil and organics before any gravel goes down.
- Lay a woven geotextile fabric to separate the subgrade from the stone.
- Increase the Granular B base depth to spread the load.
- Build in proper crown and ditching so water runs off, not through.
These steps add cost up front. However, they prevent the constant re-gravelling that soft ground otherwise demands. In the long run, doing it right once is cheaper.
Watch for Drainage and Floodplain Rules
If your driveway crosses a ditch, a watercourse, or a low floodplain area, check the rules before you dig. Local conservation authorities regulate work near water and in floodplains. You can review permit and floodplain information through Conservation Ontario.
A culvert entrance permit may also apply if you connect to a municipal road. The City of Kingston handles entrance permits and related approvals through the City of Kingston. When in doubt, ask us and we will point you the right way.
What Does Driveway Gravel Cost Around Kingston?
Gravel pricing moves with fuel, quarry rates, and haul distance. So we do not quote fixed prices online, because that would be misleading. Instead, here is what drives your total.
- Material type: Granular A and Granular B carry different rates.
- Volume ordered: Larger loads usually lower your per-tonne cost.
- Haul distance: Longer trips out into Frontenac County add trucking time.
- Site work: Grading, fabric, and culverts add to a full build.
For current, honest numbers on your specific site, ask us for a delivered quote. We break down material and trucking clearly. Learn more about our topsoil & gravel delivery options and we will give you a straight price.
Sample Volume-to-Order Table
This table gives rough tonnage for common driveway sizes, using a 150 mm base plus 75 mm surface. Treat it as a planning starting point, not a final quote.
- Short (20 m × 3.5 m): about 33 to 40 tonnes.
- Medium (40 m × 3.5 m): about 66 to 80 tonnes.
- Long (60 m × 3.5 m): about 99 to 120 tonnes.
- Very long (100 m × 4 m): about 190 to 230 tonnes.
Your real number shifts with subgrade prep and compaction. Because of that, we always confirm with an on-site look for larger jobs.
Delivery and Spreading on Long Country Driveways
A long rural lane brings its own challenges. A tandem truck carries roughly 15 to 20 tonnes per load. So a big driveway means several trips.
We think about access first. Can the truck turn around? Is there a low bridge, a soft field entrance, or overhead wires? These details decide how we stage the loads.
Spreading matters just as much as delivery. Dumping piles and raking by hand rarely gives an even, well-compacted surface. Instead, we grade and compact each layer with the right equipment. That is where our road work services come in for bigger builds.
For a look at real results, see our Picton Road driveway grading project. It shows how proper grading and compaction produce a smooth, lasting surface.
Always Call for Locates First
Before any excavation or grading, get your underground utilities marked. It is free and it is the law in Ontario. Request your locate through Ontario One Call before you or your contractor turns a single shovel.
Hitting a buried line is dangerous and expensive. So we never skip this step, and neither should you.
New Build or Resurface?
The gravel math changes depending on your starting point. A brand-new driveway needs both layers from scratch on prepared ground.
A resurface is different. If your base is still solid, you may only need a fresh top layer of Granular A. That cuts your volume and your cost.
However, if the old driveway is full of potholes and soft spots, patching the surface will not fix it. In that case, we usually reshape the base and rebuild properly. We can tell you which path fits your driveway after a quick look. Our broader site grading and lot preparation projects show both approaches in action.
Get a Free Quote
Ready to put real numbers to your driveway? We will measure, run the gravel math, and give you an honest delivered price. No pressure and no surprises.
Call M. Riddle Excavating today at 613-545-7955, or request a free quote for topsoil & gravel delivery. We serve Kingston and all of Frontenac County, and we have done this work locally for over 20 years.
Frequently Asked Questions
How much gravel do I need per metre of driveway?
For a standard 3.5 m wide driveway with both layers, plan for roughly 1.6 to 2 tonnes per lineal metre. Use our driveway gravel calculator method above to fine-tune the number for your exact width and depth.
What is the difference between Granular A and Granular B?
Granular B is a coarser, larger base stone that carries the load and drains well. Granular A is a finer crushed stone that compacts tight and forms your driving surface. A good driveway uses both, with B on the bottom and A on top.
Do I need a permit to build a driveway near Kingston?
Often no permit is needed for the driveway itself. However, connecting to a municipal road may require an entrance or culvert permit from the City of Kingston or your township. Work near a watercourse or floodplain may also need conservation authority approval.
How deep should a rural gravel driveway be?
On firm ground, aim for 150 to 200 mm of Granular B base plus 75 to 100 mm of Granular A surface, both compacted. Soft or wet subgrades need a deeper base and often a geotextile fabric underneath.
Can you deliver gravel to a long country driveway?
Yes. We deliver throughout Frontenac County and plan loads around your access, turnaround room, and any soft entrances. For long lanes, we can also grade and compact the stone properly, not just dump it.