Road Base Calculator
Calculate how much road base you need in tons, cubic yards, and cost — with compaction & material selection for USA projects.
Estimate your road base material
Your estimated quantities
Includes compaction factor + material density. Based on US standard densities and regional average pricing (2026).
How to calculate how much road base you need (Step-by-Step)
Whether you're paving a driveway in Los Angeles, building a road base in Ventura County, or preparing a foundation in San Diego, accurate measurement prevents shortages and waste. Use this method:
- Measure area – Length × Width = total square feet.
- Convert depth – Depth (inches) ÷ 12 = depth in feet.
- Cubic feet – Area × depth (ft) = cubic feet.
- Cubic yards – Cubic feet ÷ 27 = loose cubic yards.
- Apply compaction factor – Multiply by (1 + compaction%) for compacted road base volume.
- Convert to tons – Compacted cubic yards × material density (tons/cy) = total tons needed.
Pro tip for SoCal projects: In Agoura Hills, Calabasas, or Thousand Oaks, always add 10–15% extra due to rocky subgrade and compaction requirements. Our road base calculator automatically handles that with the compaction factor.
Road base material comparison
| Material Type | Typical Density (tons/yd³) | Best for | Compaction factor |
|---|---|---|---|
| Class 2 Road Base | 1.35 | Driveways, sub-base, parking lots | 12–15% |
| Class 6 Road Base | 1.40 | Road construction, heavy traffic, highways | 15–18% |
| 3/4" Crushed Base | 1.30 | Under concrete slabs, drainage layers | 10–12% |
| Recycled Road Base | 1.25 | Eco-friendly fill, rural driveways | 15% |
| Lime Rock Base | 1.50 | High stability, wet climates | 12% |
Regional insights: Southern California road base calculator
Contractors in Los Angeles County, Orange County, and San Diego frequently ask: "how much road base do I need for a 2-car driveway?" Our tool gives instant answers. For a typical 20'x20' driveway with 4" depth of Class 2, you need ≈ 5.9 loose cubic yards (≈ 8 tons compacted). Use our calculator above to fine-tune for class 2 road base calculator or class 6 road base calculator projects in Ventura, Simi Valley, Woodland Hills, and Camarillo.
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Frequently asked questions (Road base)
Class 2 has 1.5" max particle size; suitable for driveways. Class 6 is denser with 0.75" max, used for highways and heavy loads. Use our class 6 road base calculator for heavy-duty estimates.
Assuming 4" depth: ≈ 24.7 loose cubic yards (33.3 tons compacted for Class 2). Enter dimensions directly in the calculator above.
Yes! The built-in compaction factor (adjustable 0–30%) turns it into a compacted road base calculator. Perfect for subgrades and road construction.
It calculates how many square feet a ton of road base covers. Example: 1 ton of Class 2 at 4" depth covers about 12-14 sq ft. Our tool does the reverse: you input area and get tonnage.
Our calculator works for all US regions, but we included density references for local materials. Contractors in Agoura Hills, Thousand Oaks, and Woodland Hills trust our numbers for permit-ready estimates.
Absolutely. Select "3/4" Crushed Road Base" from material dropdown to get accurate tonnage and cost for that specific aggregate.
Measure the length along the centerline and average width, or compute area of half-circle. Use our calculator after getting total square footage; we recommend +10% waste for curves.
Important disclaimer – please read
TotalCalcHub provides road base estimates for guidance only. Actual requirements vary based on compaction, soil conditions, and supplier specifications. Always verify with a local material supplier or civil engineer, especially for load-bearing applications. Our calculator uses standard US units and 2026 price references.