Multiply length × width in feet by depth in feet, divide by 27 for cubic yards, then multiply by 1.35 for tons of millings. A 40 × 10 ft driveway at 4 inches deep needs about 4.9 cubic yards, or 6.7 tons — order roughly 7.7 tons with 15% compaction allowance.
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Order – tons (includes your waste allowance) so compaction and spillage don’t leave you short.
Asphalt Millings Calculator Guide
Asphalt millings are the ground-up surface of an old road, and they occupy a category of their own: cheaper than most virgin stone, yet capable of curing into a semi-solid driveway that ordinary gravel never matches. Each particle still wears a coat of bitumen, and under compaction and summer heat those coatings soften and fuse. The result sheds rain, resists ruts, and stays almost dust-free.
This calculator converts your driveway dimensions at 1.35 tons per cubic yard — millings run lighter than crusher run — and includes a 15% allowance, because millings compress substantially as they consolidate.
How Many Tons of Millings for a Driveway?
Figures assume the standard 4-inch compacted depth, where one ton of millings covers about 60 square feet.
| Project | Size | Cubic yards | Tons | Order (with 15%) |
|---|---|---|---|---|
| One-car pad | 20 × 10 ft | 2.5 | 3.3 | 3.8 |
| Two-car pad | 20 × 20 ft | 4.9 | 6.7 | 7.7 |
| Standard driveway | 50 × 10 ft | 6.2 | 8.3 | 9.6 |
| Long lane | 100 × 12 ft | 14.8 | 20.0 | 23.0 |
Supply is the catch: millings exist only where roads are being resurfaced, so availability and price swing with local paving season. When a nearby project is grinding, deals appear; call asphalt plants and paving contractors, not just quarries.
Getting Millings to Bind Like Pavement
- Prep the base as if for gravel: firm subgrade, graded with a crown — millings firm up the surface but cannot rescue a soft foundation.
- Spread in 2-inch lifts, raking each level before the next goes down.
- Wet each lift lightly — moisture lubricates the particles into a denser pack.
- Compact on a hot day. Above roughly 80°F the binder softens; a vibratory roller or heavy plate compactor then knits the surface. Some owners rent a roller twice — once at install, once during the first heat wave.
- Let traffic finish the job: a few warm weeks of driving tightens the wheel paths into a near-pavement crust.
Millings compete on price with the cheapest recycled aggregates while performing closer to a paved surface — run your local per-ton quote through the gravel driveway cost calculator to see the comparison in dollars. If you decide a conventional stone build suits the site better, the gravel driveway calculator plans that version end to end.
Frequently Asked Questions
How many tons of asphalt millings do I need?
Millings weigh about 1.35 tons per cubic yard, so one ton covers roughly 60 square feet at a compacted 4-inch depth. A two-car 20 × 20 ft pad takes about 6.7 tons plus 15% for compaction.
Do asphalt millings really harden like pavement?
Partially — the leftover bitumen coating softens in summer heat and re-binds under traffic and compaction, producing a firm, mostly dust-free surface. It never becomes true hot-mix asphalt, but it sheds water and resists ruts far better than loose gravel.
How do I compact asphalt millings?
Spread in 2-inch lifts, wet each lift lightly, and compact with a vibratory roller or heavy plate compactor — ideally on a day above 80°F so the binder softens. Driving over the finished surface for a few warm weeks tightens it further.
Are millings cheaper than gravel?
Usually — as a recycled product, millings often sell for $15–$30 per ton, undercutting washed stone and matching or beating crusher run. Supply is local and seasonal, since it depends on nearby road-resurfacing projects.