Asphalt Millings Calculator
Asphalt Millings (RAP) Calculator
Estimate how many cubic yards and tons of asphalt millings you need for a driveway or pad. Enter area, compacted thickness, a compaction factor, and a waste allowance. Add an optional USD price per ton/tonne to estimate cost.
Asphalt Millings Calculator
Estimate millings volume and tonnage with compaction
Results
Enter dimensions above to calculate
Step-by-Step Formulas
1. Area
Measure the footprint you want to cover. Use length × width for driveways and parking pads. For round areas, enter the diameter. If you already have area from plans, choose Custom area.
2. Compacted Volume
Millings thickness is the finished, compacted depth you want after rolling. Multiply area by thickness to get compacted volume.
3. Compaction Factor
Asphalt millings are delivered loose and compacted in place. A common loose-to-compacted factor is about 1.10–1.25 depending on gradation and moisture. This calculator uses the factor to estimate how much loose material you need to order.
4. Waste Allowance
Waste covers edge trimming, raking/leveling losses, uneven subgrade, and small measurement errors. 5–10% is common. Use 10–15% for irregular shapes or tight access.
5. Convert to Weight
Suppliers often quote millings by weight (tons/tonnes). Density varies by moisture and gradation, so treat it as an estimate and confirm with your supplier if you need accurate pricing.
6. Optional Cost
If you enter a price per ton/tonne, the calculator will estimate total cost based on the computed weight.
Common Compacted Thickness Ranges
| Application | Metric | Imperial |
|---|---|---|
| Walkways / light use | 40–60 mm | 1.5–2.5 in |
| Residential driveway (typical) | 50–100 mm | 2–4 in |
| Driveway base build-up | 75–150 mm | 3–6 in |
| Heavy use / farm equipment | 150–200 mm | 6–8 in |
* Ranges are indicative only. Base prep, drainage, and expected loads matter.
Typical Millings Densities
Density is one of the biggest sources of error when converting cubic yards to tons. If you have a supplier spec for your material, use it.
| Type | Metric density | Imperial density |
|---|---|---|
| Typical millings (RAP / reclaimed asphalt) | 1,760 kg/m³ | 110 lb/ft³ |
| Coarse / drier millings (lighter) | 1,600 kg/m³ | 100 lb/ft³ |
| Wet / fines-heavy millings (heavier) | 1,900 kg/m³ | 119 lb/ft³ |
Worked Example
Driveway: 20 ft × 12 ft, 3 in compacted, compaction factor 1.15×, 7.5% waste, density 110 lb/ft³.
💡 Pro tip
If your millings are wet, they can weigh noticeably more per cubic yard. For cost estimates, use the weight your supplier invoices (scale ticket) whenever possible.
Frequently Asked Questions
- What is a typical compaction factor for asphalt millings?
- A common loose-to-compacted factor is about 1.10–1.25. The exact value depends on gradation, moisture, placement method, and rolling.
- How thick should asphalt millings be for a driveway?
- Many residential driveways use roughly 50–100 mm (2–4 in) of compacted millings, but the right thickness depends on subgrade, base, drainage, and loads.
- Should I calculate millings by cubic yards or tons?
- Both are useful. Trucks may be loaded by volume, while quotes are often by weight. Because density varies, weight estimates are approximate unless you confirm density with your supplier.
- What waste percentage should I use for millings?
- 5–10% is common. Use more for irregular shapes, edge tapering, and areas with tight access.