Estimate How Much Gravel You Need For A Driveway, Path, Garden Bed, Drainage Layer Or General Landscaping Project. Enter Your Measurements, Choose A Practical Compacted Depth, Add Waste, Set An Editable Bulk Density And See Cubic Metres, Approximate Tonnes, Kilograms And Material Cost.
Select The Shape Or Measurement Method That Best Matches Your Project. The Estimator Converts Your Dimensions Into Cubic Metres, Then Uses The Density You Enter To Approximate Tonnes.
Your Gravel Estimate Will Appear After You Press Calculate Gravel.
The PDF Includes The Site Name, Measurement Method, Key Inputs, Waste Allowance, Density, Cubic Metres, Approximate Tonnes And Material-Only Cost.
Gravel Volume Depends On Surface Area And Depth. A Small Increase In Depth Can Add A Significant Amount Of Material Across A Large Driveway Or Landscaping Area.
Use One Tool To Move From Basic Measurements To An Order-Friendly Quantity While Keeping Density, Waste And Price Fully Editable.
Estimate The Geometric Volume Required Before Waste Or Compaction Allowance.
Convert Cubic Metres To Tonnes Using The Bulk Density You Enter.
Add A Practical Buffer For Uneven Subgrade, Spreading And Site Variations.
Use Your Own A$/t Supplier Price Instead Of A Fixed National Gravel Rate.
Save The Main Measurements, Quantity And Cost Estimate For Quote Comparison.
Work With Metres, Millimetres, Cubic Metres, Tonnes And Australian Dollars.
A Gravel Estimator Helps Turn The Size Of A Driveway, Path, Garden Bed Or Base Layer Into A Practical Material Quantity. For A Rectangular Area, Start With Length And Width To Find Surface Area, Then Multiply By The Gravel Depth. Because Gravel Depth Is Commonly Measured In Millimetres, Convert It To Metres Before Multiplying. The Result Is A Volume In Cubic Metres.
Volume Is Only One Part Of Gravel Ordering. Many Landscape Yards And Quarries Sell Bulk Aggregate By Tonne, While Others Quote By Cubic Metre. To Move Between The Two, You Need A Bulk Density For The Exact Product. Crushed Rock, Drainage Gravel, Decorative Stone And Recycled Aggregate Can Have Different Bulk Densities, and moisture and grading can also affect apparent weight. For that reason this estimator leaves density editable rather than pretending one number fits every gravel product.
Volume (m³) = Length (m) × Width (m) × Depth (m)If A Driveway Is 10 Metres Long, 3 Metres Wide And The Gravel Layer Is 50 mm Deep, Convert 50 mm To 0.05 m. The Base Volume Is 10 × 3 × 0.05 = 1.50 m³. A Waste Or Contingency Allowance Can Then Be Added Before Converting The Volume To An Approximate Weight.
Divide Millimetres By 1000. A 25 mm Layer Is 0.025 m, 50 mm Is 0.05 m, 75 mm Is 0.075 m And 100 mm Is 0.10 m. Depth Has A Direct Effect On Quantity: doubling the depth doubles the gravel volume for the same surface area.
| Gravel Depth | Depth In Metres | Volume Per 10 m² | Volume Per 50 m² |
|---|---|---|---|
| 25 mm | 0.025 m | 0.25 m³ | 1.25 m³ |
| 50 mm | 0.050 m | 0.50 m³ | 2.50 m³ |
| 75 mm | 0.075 m | 0.75 m³ | 3.75 m³ |
| 100 mm | 0.100 m | 1.00 m³ | 5.00 m³ |
| 150 mm | 0.150 m | 1.50 m³ | 7.50 m³ |
Approximate Tonnes = Gravel Volume (m³) × Bulk Density (t/m³)Bulk density is the key conversion factor between volume and weight. Ask your supplier for the density or the typical tonnes-per-cubic-metre figure for the exact material you plan to order. This is more reliable than using a generic internet value because aggregate size, grading, moisture, voids and source rock can change how much a cubic metre weighs.
The correct depth depends on the project, material, subgrade, expected traffic and construction detail. A decorative surface layer over a prepared base is a different job from building a new vehicle driveway or drainage trench. Use the depth specified by your landscape design, contractor, engineer, council detail or product supplier. This estimator calculates quantity from the depth you enter; it does not design the pavement or select a structural layer thickness.
A driveway estimate should account for the actual width, length, shape, edge conditions and any areas that flare near a road or garage. If the driveway is irregular, divide it into rectangles or use the known-area option after measuring the total square metres. For a new driveway, remember that the visible gravel layer may sit over separate sub-base or base-course layers. Calculate each material layer independently when they use different products or depths.
For garden paths, courtyards and decorative gravel zones, measure the finished surface area inside the edging. Curved spaces can be approximated as circles, rectangles or a group of smaller simple shapes. If you already know the square metres from a landscape plan, the Area × Depth mode is usually faster. Keep the decorative gravel quantity separate from bedding sand, road base, geotextile or edging materials.
Drainage aggregate is often used around pipes, behind retaining walls or beneath concrete and landscaping. The voids occupied by a pipe or another object can reduce the real gravel volume, so complex trenches may need a more detailed displacement calculation. For concrete-related projects, use the Concrete Post Hole Calculator for concrete around posts, the Concrete Foundation Calculator for foundations, or the Concrete Volume Calculator when the material is concrete rather than gravel.
A contingency can be useful because site dimensions are rarely perfect. Ground can have depressions, excavated edges can spread, gravel can compact after placement, and some material can be lost during loading, transport and spreading. The right allowance is project-specific. Enter zero if you want the pure geometric quantity, then test different percentages to understand how a small buffer affects tonnes and budget.
Before comparing quotes, make sure every supplier is pricing the same product, grading and quantity basis. One quote may be per tonne while another is per cubic metre. Delivery can be separate, and minimum-load fees may apply. Ask whether the quoted amount is ex-yard or delivered, whether GST is included, what truck access is required and whether the supplier can provide a typical bulk density. The Gravel Estimator can help normalise the material quantity, but the final order should follow the supplier's product data and loading rules.
Estimated Cost = Rounded Tonnes × Supplier Price Per TonneThe cost result on this page is intentionally material-only. Delivery, spreading, excavation, geotextile, compaction equipment, edging, drainage, labour and disposal can all affect the total project budget. For concrete work, you can separately compare material spending with the Concrete Cost Calculator.
| Project | Measurements | Base Volume | With 10% Extra |
|---|---|---|---|
| Small Driveway | 10 m × 3 m × 50 mm | 1.50 m³ | 1.65 m³ |
| Garden Path | 12 m × 1.2 m × 40 mm | 0.576 m³ | 0.634 m³ |
| Landscape Bed | 25 m² × 60 mm | 1.50 m³ | 1.65 m³ |
| Round Feature Area | 4 m Diameter × 50 mm | 0.628 m³ | 0.691 m³ |
Bulk gravel is heavy and can create manual-handling, vehicle and dust hazards. Plan truck access, unloading location and safe spreading before delivery. When work generates dust from stone or other silica-containing materials, use appropriate controls and follow current workplace guidance. Safe Work Australia provides information about crystalline silica and dust exposure. For general Australian geological and mineral background, Geoscience Australia provides educational mineral information.
Quick Answers About Gravel Volume, Tonnes, Depth, Density, Waste And Cost.
For a rectangular area, multiply length by width by depth after converting the depth to metres. This gives cubic metres. Add any project-specific allowance, then use the supplier's bulk density if you need an approximate weight in tonnes.
Multiply cubic metres by the bulk density in tonnes per cubic metre. Use the density supplied for the exact gravel product because different aggregates can have different bulk weights.
The estimator does not force a generic density. Enter the supplier-stated or project-specific bulk density so the tonnes result matches the material you are actually considering.
Depth depends on the use, subgrade, material and structural design. Enter the depth required by your project documents, contractor or supplier. The calculator estimates quantity; it does not choose a structural depth.
Yes. Measure the driveway area and enter the planned gravel depth. For multi-layer driveways, calculate each layer separately if the materials or depths are different.
Yes. Use the rectangle, circle or known-area mode and enter the planned decorative layer depth. Confirm the specific product density with the landscape supplier if you want a tonnes estimate.
There is no universal percentage. Extra material depends on measurement accuracy, ground conditions, compaction and handling. Use the editable waste field to test the allowance appropriate to your project.
No. The calculator multiplies rounded tonnes by the price per tonne you enter. Delivery, minimum-load charges, labour and other project costs should be added separately unless your entered rate already includes them.
The light zero is only a placeholder. The actual numeric fields start empty, so when you type a value such as 5 it remains 5 rather than becoming 05.
Yes. After calculating, use the PDF button to save the main measurements, density, waste allowance, cubic metres, approximate tonnes and material cost.
Confirm Your Final Product, Density, Delivery Requirements And Site Safety With Current Supplier And Official Information.
National Information About Crystalline Silica And Managing Dust Exposure.
Read Silica GuidanceAustralian Educational Information About Minerals And Geological Materials.
View Mineral InformationAsk For Product Grading, Bulk Density, Minimum Load, Delivery And Pricing Information.
Use Plans, Specifications Or Professional Advice To Confirm Required Layer Depth And Material Type.