Gravel Calculator

Calculate gravel volume, weight, material requirements, and project costs instantly with advanced landscaping and construction estimation tools.

Gravel Calculator

Quick start:

Area to cover

Length

Width

Depth of gravel

Depth≈ 4.0 in

Gravel type

Delivery

Truck payloadtonnes / load

Overage allowance

Fill in the inputs above and press Calculate to reveal your gravel calculator results, live depth preview, and smart insights.

What is a gravel calculator?

A gravel calculator turns three simple measurements — the area you want to cover, how deep the gravel should go, and the type of stone you're using — into everything you need to order the right amount the first time. Instead of guessing, you get the exact volume in cubic yards and cubic metres, the total weight in tonnes, the number of truckloads, and a complete project cost.

This planner goes far beyond a basic volume estimator. It includes a built-in density database for nine common gravel types, supports rectangular, circular, and total-area measurement, models compaction and overage allowance, recommends the best stone for your project, and visualizes the excavation depth and coverage live as you type. Whether you're surfacing a driveway, building a patio base, or laying a French drain, the goal is the same: order confidently, avoid costly second deliveries, and never pay for gravel that ends up sitting in a pile.

How gravel calculations work

Measure the area

Find the area to cover. For a rectangle, multiply length by width; for a circle, use π × radius². For an irregular shape, split it into rectangles and add them. You can enter dimensions directly or type a known area in ft², yd², m², acres, or hectares.

Choose the depth

Multiply the area by how deep the gravel should sit to get the volume. Depth is the biggest cost driver — 2 in suits a path, 4 in a driveway top, and 6 in or more a compacted base or drainage layer.

Convert volume to weight

Gravel is sold by weight as well as volume, so the calculator multiplies the volume by the stone's bulk density. A cubic metre of crushed stone weighs about 1.6 tonnes, so weight and volume don't line up one-to-one between gravel types.

Add an overage allowance

Gravel compacts when it's rolled, and some is always lost to spillage and uneven ground. A 10% allowance suits most jobs; deep, heavily compacted base courses can justify 15% or more so you never run short mid-project.

3 ways to use this calculator

Order the exact amount

Enter your area, depth, and gravel type to get the precise volume, weight, and truckloads — with a compaction allowance built in so you don't run short or over-order.

Budget the whole project

Add a price per kg, per tonne, per cubic metre, or per cubic yard and instantly see your material cost, the overage cost, a bulk-purchase estimate, and total spend in your currency.

Pick the right stone

Tell the landscaping estimator your project type and it recommends the most suitable gravel, the right depth, and the advantages and trade-offs of each option.

Gravel ordering best practices

Always add an overage allowance — 10% for loose decorative cover, 15% or more for driveways and base courses that get compacted, plus extra for uneven or sloping ground.
Order by the truckload for large jobs — bulk delivery is far cheaper per tonne than bagged gravel, and one delivery beats several small trips.
Lay deep base courses in layers (lifts) and compact each one — a single deep pour won't compact evenly and will settle later.
Use a weed membrane and edging under decorative gravel so stones stay put and weeds don't push through.
Match the stone to the job: angular crushed stone for load-bearing surfaces, rounded river rock and pea gravel for drainage and comfort underfoot.

Why getting the quantity right matters

Gravel is one of the few landscaping materials where buying the wrong quantity costs you twice. Order too little and the job stalls while you wait for a second delivery — and a small top-up load is expensive per tonne. Order far too much and you've paid to have a pile of stone dumped on your drive that you now have to move or dispose of. An accurate volume, converted to weight and truckloads with a sensible overage margin, is the single best way to keep a project on time and on budget.

Beyond the headline volume, the details decide the final bill: depth drives cost more than area, the stone's density changes how much weight (and therefore how many truckloads) a given volume becomes, and the pricing basis — per tonne, per cubic yard, or per bag — determines how a supplier's quote maps to your real site. Getting all of these right in one place is what separates a confident order from an expensive guess.

Real-life gravel projects

Gravel driveway

Surface a residential driveway with 4 in of angular crushed stone over a compacted sub-base, and work out tonnage and truckloads with a generous compaction allowance.

Garden & walkway paths

Lay 2 in of smooth pea gravel or decorative stone over a membrane for a comfortable, low-maintenance path that won't track mud.

Patio & paver base

Estimate the compacted crushed-stone sub-base under slabs or pavers so the finished surface won't settle, dip, or heave.

French drains & drainage

Size clean, single-sized drainage gravel around perforated pipe for soakaways and French drains where free water flow is critical.

Decorative landscaping

Cover beds and borders with marble chips or coloured aggregate for a clean, weed-suppressing ground cover that lasts for years.

Parking areas

Plan a deeper, well-compacted angular surface that stands up to heavier and more frequent vehicle loads than a typical driveway.

Playground surfacing

Estimate rounded, smooth stone at a cushioning depth for play areas, and check local safety-surfacing guidance for the right material.

Construction base layers

Scale the estimate to large structural sub-bases, compacted in lifts, and keep tight control of tonnage, truckloads, and budget.

Core gravel formulas

Area (rectangle)

Length × Width

A 12 m × 4 m driveway is 48 m². For circles use π × radius²; split irregular shapes into rectangles and add the parts.

Volume

Area × Depth

48 m² at 0.1 m (about 4 in) deep is 4.8 m³ — roughly 6.3 cubic yards of gravel before any allowance.

Weight

Volume × Density

4.8 m³ of crushed stone at 1,602 kg/m³ weighs about 7.7 tonnes. Different stones have different densities, so weight isn't fixed by volume alone.

With overage

Quantity × (1 + Waste %)

7.7 tonnes with a 10% compaction allowance ≈ 8.5 tonnes, covering settling, spillage, and uneven ground so the job never stalls.

Truckloads

⌈ Weight ÷ Truck payload ⌉

8.5 tonnes in a 10-tonne tipper is one load. Larger jobs need multiple deliveries — gravel trucks are limited by weight, not volume.

Project cost

Quantity × Unit price

8.5 tonnes at a price per tonne gives the material cost. Bulk loads are typically cheaper per tonne than bagged gravel.

Common gravel calculation mistakes

Forgetting compaction

Loose gravel compresses when it's rolled and settles over uneven ground. Buying the exact loose volume leaves you short — always add 10–15% so the finished, compacted depth is what you planned.

Confusing weight and volume

Suppliers quote by tonne or by cubic yard, and they aren't interchangeable. A tonne of light decorative chips covers more ground than a tonne of dense granite — always check which basis the price uses.

Underestimating depth

Depth multiplies straight into volume and cost. A path needs only 2 in, but a driveway top wants 4 in and a base course 6 in or more — using path depth on a driveway guarantees a shortfall.

Ignoring truck access

A big order arrives by tipper truck and gets dumped in one spot. If access is tight or the drop point is far from the work, factor in the time and labour to barrow it — or order bulk bags instead.

How accurate is this calculator?

Every figure here uses the standard area-volume-density maths that landscapers, groundworkers, and aggregate suppliers rely on: area multiplied by depth for volume, volume multiplied by the stone's bulk density for weight, and a transparent overage allowance you control. The density values are published loose, dry bulk densities for each gravel type, and the truckload counts assume a typical tipper payload you can adjust to your supplier's trucks.

Treat the results as an accurate planning estimate, not a substitute for a supplier quote. Real bulk density shifts with moisture and stone size, ground rarely sits perfectly level, and compaction varies with how the gravel is laid. For large or structural jobs, confirm the final order against your supplier's tonnage and your own site measurements before booking the delivery.

Frequently Asked Questions

Multiply the area you want to cover by how deep the gravel should sit to get the volume, then convert that volume to weight using the stone's density. The calculator does this precisely: it works out the area from your dimensions, multiplies by the depth for the volume in cubic yards and cubic metres, multiplies by the gravel's bulk density for the weight in tonnes, and adds an overage allowance for compaction. For example, a 12 × 4 m driveway at 4 in deep needs about 4.8 m³ (6.3 cubic yards) of crushed stone, or roughly 8.5 tonnes with a 10% allowance.

Gravel calculations rest on three inputs: the area, the depth, and the type of stone. Area multiplied by depth gives the volume; volume multiplied by the stone's bulk density gives the weight. Because gravel compacts and some is always lost to spillage and uneven ground, an overage allowance is added on top. The result is given in cubic yards and cubic metres for ordering by volume, and in tonnes and US tons for ordering by weight, along with how many truckloads it represents.

Most gravels weigh between about 1.4 and 1.7 tonnes per cubic metre (roughly 2,400–2,900 lb per cubic yard). Crushed stone is around 1,602 kg/m³, pea gravel about 1,800 kg/m³, and lighter decorative chips closer to 1,440 kg/m³. Because density varies by stone type and moisture, the same volume can weigh noticeably different amounts — which is why the calculator lets you pick the exact gravel type or enter a custom density.

Depth depends on the job. A decorative bed or garden path needs only about 2 in, a residential driveway top course wants around 4 in over a compacted sub-base, and a structural base or drainage layer needs 6 in or more. Deeper layers should be laid and compacted in stages (lifts) rather than one deep pour. Remember that depth multiplies straight into volume and cost, so confirm the depth your project actually needs before ordering.

Gravel cost is the quantity you need multiplied by the supplier's unit price. Suppliers price per tonne, per cubic yard, per cubic metre, or per bag, and they aren't interchangeable, so the calculator lets you choose the pricing basis and currency. It then shows the material cost for the exact quantity, the extra cost of the overage allowance, the total recommended spend, and a bulk-purchase estimate — since buying loose by the truckload is usually far cheaper per tonne than bagged stone.

Angular crushed stone and limestone are the best all-round driveway materials because their sharp edges lock together and compact into a firm, load-bearing surface. Granite is even harder-wearing where budget allows. Avoid smooth, rounded stone like river rock or pea gravel for driving surfaces — it rolls underfoot and under tyres and won't compact. A two-layer build with a coarse base and a finer top course wears best under vehicles.

The maths is exact for the numbers you enter — it uses the same area, volume, and bulk-density formulas that landscapers and aggregate suppliers rely on, with a transparent overage allowance you control. Real-world results vary a little because bulk density shifts with moisture and stone size, ground is rarely perfectly level, and compaction depends on how the gravel is laid. Use it for confident planning and budgeting, and confirm large orders against your supplier's tonnage.

Find your volume in cubic metres (area × depth), then multiply by the stone's density in tonnes per cubic metre. Crushed stone is about 1.6 t/m³, so 5 m³ is roughly 8 tonnes before overage. The calculator reports the weight in metric tonnes, US short tons, and kilograms, with the compaction allowance included, and also tells you how many truckloads that represents at your chosen per-load payload.

Gravel density — or bulk density — is the weight of a given volume of loose stone, usually expressed in kilograms per cubic metre. It depends on the rock type, the stone size, and how much air sits between the pieces. Denser stones like granite (around 1,680 kg/m³) weigh more per cubic metre than light decorative chips (around 1,440 kg/m³). Density is what converts a volume into a weight, so getting it right matters when ordering by the tonne. The calculator includes a built-in density database and a custom-density option.

Divide your total gravel weight by the payload of the delivery truck, then round up. Gravel trucks are limited by weight rather than volume, so a typical tandem tipper carries around 10–15 tonnes per load. The calculator counts truckloads from the weight (including overage) at a per-load payload you can adjust to match your supplier's trucks. For large jobs, ordering full loads is far cheaper per tonne than several small deliveries.

Gravel Calculator