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Calculate how much road base (DGB / crusher run) to order. Enter the compacted depth you need — the calculator applies the compaction factor (1.30–1.35×) to work out the loose volume to purchase.
Part of the Landscaping & Site Work calculators — see all tools in this category.
This calculator works out how much loose road base to order to achieve a target compacted depth. Road base compacts significantly during installation — the compaction factor accounts for this.
Compacted volume: Area (m²) × Compacted Depth (m)
Loose order volume: Compacted Volume × Compaction Factor
Order with waste: Loose Volume × (1 + Waste %)
Weight: Order Volume × 2.0 t/m³
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Total area to be covered with road base
Final depth after compaction — standard is 100–200mm
Add 10% for spillage — applied after compaction factor
Loose volume to purchase
Road base at 2.0 t/m³
In-situ depth × area
Before waste (×1.3 compaction)
Compaction factor: 1.3× — you need 30% more loose material than the finished depth to achieve the target 150mm after compaction.