How Much Asphalt Millings for 400 Square Feet?
How much asphalt millings for 400 square feet depends on depth. At 4 inches you need about 4.94 cubic yards, roughly 6.4 tons at 1.3 tons per yard. Going to 6 inches raises it to 9.6 tons.
Volume and tonnage calculator →Asphalt millings for 400 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 3 in | 3.70 | 4.8 | 5.3 |
| 4 in | 4.94 | 6.4 | 7.1 |
| 6 in | 7.41 | 9.6 | 10.6 |
Working it out
- 400 sq ft × (4 ÷ 12) ft = 133.3 cubic feet.
- ÷ 27 = 4.94 cubic yards.
- × 1.3 tons per yard = 6.4 tons.
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. Typical weight: 1.2 to 1.4 loose tons per cubic yard.
Ordering checklist
- Measure odd shapes in pieces. Split curves and L-shapes into rectangles and add them.
- Add a margin. About 10 percent covers compaction and low spots.
- Bulk or bags. Bulk delivery is the practical choice here.
- Prep first. Remove sod, compact the subgrade and set edging before the stone arrives.
Use the volume and tonnage calculator for any other size.
When to choose asphalt millings
Best suited to:
- 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 2 inches takes about 4.0 tons.
- Weight used here: about 1.3 tons per cubic yard.
Mistakes that throw off the order
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
Questions people ask
How many tons of asphalt millings for 400 square feet?
About 6.4 tons at 4 inches deep.
How many cubic yards of asphalt millings for 400 square feet?
About 4.94 yards at 4 inches.
How much asphalt millings for 400 square feet at 3 inches?
About 4.8 tons, or 3.70 cubic yards.
How much does a yard of asphalt millings weigh?
About 1.2 to 1.4 loose tons.
Should I add extra?
Yes, about 10 percent is a common allowance.
Related guides
- How Many Tons of Asphalt Millings for a 40x25 Area?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much Asphalt Millings for 250 Square Feet?
- How Much Asphalt Millings for 300 Square Feet?
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