How Much Asphalt Millings for a 18x20 Parking Pad?
A 18 by 20 foot parking pad is 360 square feet. How much asphalt millings for a 18x20 parking pad depends on depth: at 4 inches it is about 4.44 cubic yards or 5.8 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.
Volume and tonnage calculator →The math for a 18x20 parking pad
- Area: 18 × 20 = 360 sq ft.
- Depth in feet: 4 ÷ 12 = 0.333 ft.
- Cubic feet: 360 × 0.333 = 120.0 cu ft.
- Cubic yards: ÷ 27 = 4.44 yd³.
- Tons: × 1.3 = 5.8 tons.
The volume and tonnage calculator does this for any size.
Asphalt millings needed by depth
| Depth | Cubic yards | Tons (approx.) | Tons +10% |
|---|---|---|---|
| 3 in | 3.33 | 4.3 | 4.8 |
| 4 in | 4.44 | 5.8 | 6.4 |
| 6 in | 6.67 | 8.7 | 9.5 |
About asphalt millings
Asphalt millings are ground-up old pavement. When compacted and warmed by sun they bind into a fairly firm surface, which is why they are popular for rural drives and lots. If the yard sells by the cubic yard instead of the ton, use the cubic-yard column directly.
Preparing the parking pad
Dig out organic soil, compact the subgrade and set an edge so the stone does not migrate onto the lawn. A pad that holds parked weight for long periods benefits from a dense base under the surface stone. This parking pad sees parked vehicles, so match the depth to that load rather than to the minimum.
Ordering tips
- Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
- Delivery size. 6.4 tons fits in a single typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
- Bulk vs bags. At this size bulk delivery is usually the practical choice.
- Where it drops. Have the truck dump as close to the parking pad as firm ground allows.
Where asphalt millings fits
Works well for:
- Rural driveways and farm lanes
- Parking areas where a dust-free surface is wanted
- Low-cost base under a future paved surface
Poor fit for:
- Areas near wells or streams where local rules limit them
- Decorative or barefoot areas
- Jobs needing a uniform, clean look
Quick reference numbers
- Per inch over 100 sq ft: about 0.40 tons of asphalt millings (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.0 tons.
- Another size for comparison: a 20x25 area at 3 inches takes about 6.0 tons.
- Weight used here: about 1.3 tons per cubic yard.
Common estimating mistakes
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
Questions people ask
How many tons of asphalt millings for a 18x20 parking pad?
About 5.8 tons at 4 inches deep, or 6.4 tons with 10 percent extra.
How many cubic yards is a 18x20 parking pad at 4 inches?
About 4.44 cubic yards.
How much does a cubic yard of asphalt millings weigh?
Usually around 1.2 to 1.4 loose tons, depending on stone size, fines and moisture.
How deep should asphalt millings be for a parking pad?
The table above shows 3 to 6 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.
How many square feet is 18x20?
360 square feet.
Related guides
- How Many Tons of Asphalt Millings for a 40x25 Area?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much Asphalt Millings for a 16x40 Parking Pad?
- How Much Asphalt Millings for a 16x50 Parking Pad?
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