| Scenario | Shape | Dimensions | Count | Waste | Compaction | Density | Adjusted Volume | Estimated Weight |
|---|---|---|---|---|---|---|---|---|
| Driveway base | Rectangle | 12 m × 3.5 m × 0.15 m | 1 | 5% | 8% | 1600 kg/m³ | 6.8040 m³ | 10.886 t |
| Round pad | Circular | Diameter 4 m × 0.10 m | 2 | 3% | 10% | 1500 kg/m³ | 2.8499 m³ | 4.275 t |
| Service trench | Trench | 25 m × 0.60 m × 0.25 m | 1 | 7% | 0% | 1700 kg/m³ | 4.0125 m³ | 6.821 t |
The calculator first determines the theoretical volume from geometry:
- Rectangle / trench / road:
V = L × W × T - Circular area:
V = π × (D/2)² × T - Multiple identical areas:
Vtotal = V × Count
It then applies allowances for waste and compaction:
Vadj = Vtotal × (1 + Waste%/100) × (1 + Compaction%/100)
Finally, it estimates weight using bulk density:
Weight(kg) = Vadj(m³) × Density(kg/m³).
- Select the calculation method and the shape that matches your layer.
- Choose your dimension unit and enter length, width, and thickness, or diameter for circular pads.
- Set the number of repeated areas if your project has multiple identical sections.
- Add waste and compaction percentages based on site practice and material type.
- Enter a realistic bulk density to estimate tonnage for ordering and hauling.
- Press Calculate, then download CSV or PDF for records.
1) Why aggregate quantity matters
Base, subbase, and bedding layers control stability, drainage, and long‑term performance. Under-ordering can halt work, while over-ordering increases hauling and disposal costs. This calculator converts field dimensions into a consistent volume, then adds realistic allowances so you can order with confidence.
2) Typical layer thickness ranges
For light-duty driveways, base thickness often falls around 100–200 mm, while walkways may use 75–150 mm. Road and yard areas frequently specify thicker sections depending on traffic class and subgrade condition. Enter the compacted thickness you need, then apply a compaction factor to estimate loose delivery volume.
3) Waste allowance as a planning control
Waste captures trimming at edges, spillage, uneven subgrade, and stockpile handling losses. Many crews start with 3–7%, then adjust based on site access, weather, and placement method. Using a percentage makes your estimate scalable for both small pads and long trenches.
4) Compaction factor and field reality
Compaction reduces void space, so the delivered loose aggregate must exceed the compacted in-place volume. A common planning range is 5–12% for granular materials, but project specs and moisture conditions can shift this. Use the compaction input to align orders with your target finished thickness.
5) Density and tonnage conversions
Suppliers often quote by weight, so the calculator estimates kilograms and tons from volume using bulk density. Loose aggregate densities commonly range from about 1400 to 1800 kg/m³, depending on gradation, moisture, and rock type. If your supplier provides a ticket density, use that value for best accuracy.
6) Geometry options for jobsite layouts
Rectangles cover slabs and pads, circular areas suit pier pads and tank rings, and trench inputs match utilities and drainage runs. The “count” option is useful when the same section repeats across multiple bays or footings. When you already know the volume, switch to the “known volume” method to apply allowances and weight quickly.
7) Quality checks before ordering
Validate dimensions against drawings and field measurements, confirm units, and ensure thickness reflects the compacted requirement. Recheck waste and compaction against site history. If the result seems high, confirm whether depth was entered as centimeters versus meters, and verify that the correct shape is selected.
8) Using outputs for procurement and logistics
Use adjusted volume for ordering and truck planning, and use estimated tonnage to compare supplier quotes. Export the CSV for internal tracking or import into a cost sheet. The PDF report is handy for approvals, delivery coordination, and documenting assumptions such as waste, compaction, and density.
1) Should I order based on theoretical or adjusted volume?
Use adjusted volume for ordering because it includes waste and compaction allowances. Theoretical volume is useful for checking geometry and comparing design quantities to field measurements.
2) What bulk density should I enter?
Start with 1600 kg/m³ for many loose aggregates, then replace it with your supplier’s ticket density if available. Moisture, gradation, and rock type can change density significantly.
3) How do I choose a compaction percentage?
Many granular bases use 5–12% as a planning range. If your project specification or past site records indicate a different shrinkage, use that value for more realistic orders.
4) Can I estimate for multiple identical pads or segments?
Yes. Set “Number of identical areas” to the count of repeated sections. The calculator multiplies the single-section volume before applying waste, compaction, and weight conversion.
5) Why does the circular option use diameter?
Diameter is common in field layouts and drawings. The calculator converts diameter to radius and applies the circular volume formula, then multiplies by thickness and count.
6) When should I use the “known volume” method?
Use it when you already have a measured or supplier-provided volume and only need allowances and tonnage. This is helpful for stockpiles, takeoffs, or revision checks.
7) Are the weight results exact for trucking?
No. Weight is an estimate based on bulk density. For trucking limits and invoicing, rely on scale tickets and local haul regulations, and treat the calculator’s tonnage as a planning value.