Asphalt Calculator
Calculate hot-mix asphalt in tons and truckloads or switch to cold-patch bags for repairs, with thickness presets and optional base stone planning.
Thickness and Base Guide
| Project type | Compacted asphalt | Base guidance |
|---|---|---|
| New residential driveway | 3–4 in | 6–8 in compacted aggregate base |
| Overlay / resurface | 1.5–2 in | Existing pavement and base must still be sound |
| Heavy-use / RV area | 4 in | 8 in base is a safer planning point |
| Cold-patch repair | Per bag guidance | Deep voids may need gravel fill and multiple lifts |
Start with the section design, not the tonnage
Tonnage is the ordering unit, but thickness and base depth drive whether the design makes sense. A driveway that looks correct on paper can still fail early if drainage is poor or the aggregate base is skipped.
When Cold Patch Stops Being the Right Tool
Bagged cold patch is built for small potholes, utility cuts, and spot repairs. It is convenient because you can buy it retail, but it is not a replacement for a large hot-mix paving job.
If the repair is deep, compact the material in lifts. If the damaged area is broad, compare hot mix or contractor paving before you commit to dozens of bags. The calculator warns when a repair starts pushing beyond the small-patch use case.
How the Math Works
Hot mix: Area in square feet is multiplied by compacted thickness in feet to get cubic feet. Waste is added, then the calculator multiplies by asphalt density to convert that volume into pounds and finally into tons.
Truckloads: If you enter a truck capacity, the calculator rounds up the tonnage to a whole truck-count planning number. That helps for dispatch conversations, but supplier minimums and short-load policies still vary.
Repairs: Cold patch uses repair volume and product yield instead of supplier tonnage. The calculator rounds bag counts up because you cannot buy a fraction of a bag.
Base stone: When base is included, the same area is multiplied by base depth, waste is added, then the result is converted to cubic yards and tons. Use this as a planning number for the aggregate layer, not a substitute for site prep judgment.
Worked Example: New 20 × 30 Driveway
A homeowner is planning a new 20 × 30 ft asphalt driveway with the standard 3.5-inch compacted asphalt layer and a 6-inch aggregate base.
- 1 Driveway area: 20 ft × 30 ft = 600 sq ft
- 2 Compacted asphalt thickness: 3.5 inches (new-driveway default)
- 3 Asphalt volume: 600 × (3.5/12) = 175 cu ft
- 4 Add 5% waste: 175 × 1.05 = 183.8 cu ft
- 5 Hot-mix tonnage: 183.8 × 145 / 2000 = 13.3 tons
- 6 Base layer at 6 inches: 600 × (6/12) × 1.05 = 11.7 cu yd of aggregate
An existing 20 × 30 ft driveway is structurally sound and only needs a 2-inch overlay.
- 1 Existing driveway area: 20 ft × 30 ft = 600 sq ft
- 2 Overlay thickness: 2 inches
- 3 Asphalt volume: 600 × (2/12) = 100 cu ft
- 4 Add 5% waste: 100 × 1.05 = 105 cu ft
- 5 Hot-mix tonnage: 105 × 145 / 2000 = 7.6 tons
A homeowner is filling a 4 × 4 ft pothole at 2 inches deep using Quikrete cold patch.
- 1 Pothole size: 4 ft × 4 ft = 16 sq ft
- 2 Repair depth: 2 inches
- 3 Repair volume: 16 × (2/12) = 2.7 cu ft
- 4 Add 5% waste: 2.7 × 1.05 = 2.8 cu ft
- 5 Quikrete yield: 0.5 cu ft per bag
- 6 Bag count: 2.8 / 0.5 = 6 bags after rounding up
Sources
Frequently Asked Questions
How much asphalt does a 20 × 30 driveway need? +
Why does asphalt get ordered in tons instead of square feet? +
What density should I use for asphalt? +
When is bagged cold patch appropriate? +
Do new asphalt driveways need aggregate base? +
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