Asphalt Millings Calculator
An asphalt millings calculator finds cubic yards (L × W × depth ÷ 27) and multiplies by 1.35 tons per yd³; a 30 × 12 ft drive at 3 in needs 4.5 tons.
What your order looks like
One bulk delivery is usually easier than hauling it yourself.
3.33 yd³ · 4.5 tons
45 wheelbarrow trips (2 cu ft each)
6 pickup loads (0.75 ton each)
1 small dump truck load (6 tons each)
Rules of thumb: A wheelbarrow trip is 2 cubic feet of heavy material, about 200 lb, a load most people can push. A pickup load is 0.75 ton, the payload of a full-size half-ton pickup (1,500 lb). A small single-axle dump truck carries about 6 tons.
How the asphalt millings calculator works
This asphalt millings calculator finds the volume of your driveway or parking pad, then converts it to the weight a supplier sells. The formula is tons = (length × width × depth in inches ÷ 12) ÷ 27 × 1.35. The 1.35 is the assumed weight of loose millings in tons per cubic yard. Tick the 10% box and the tons are multiplied by 1.10 before pricing.
The formula in plain words
- Multiply length by width to get square feet.
- Multiply by the depth in feet (3 inches is 0.25 ft) to get cubic feet.
- Divide by 27 to get cubic yards.
- Multiply by 1.35 to get tons.
- Optional: multiply by 1.10 for spillage, low spots, and compaction.
- Cost = tons × price per ton.
Millings arrive loose and shrink when rolled, so the extra 10% is worth keeping on for most jobs.
Worked examples
- Default single-car driveway: 30 × 12 ft, 3 in deep, $30/ton
- Volume: 30 × 12 × 0.25 = 90 cu ft ÷ 27 = 3.33 yd³
- Tons: 3.333 × 1.35 = 4.50 tons, costing $135.00
- With 10% added: 4.50 × 1.10 = 4.95 tons, costing $148.50
- Gravel lot upgrade: 60 × 10 ft, 4 in deep, $30/ton, 10% on
- Volume: 60 × 10 × 0.333 = 200 cu ft ÷ 27 = 7.41 yd³
- Tons: 7.407 × 1.35 = 10.00 tons
- With 10% added: 11.00 tons, costing $330.00
Eleven tons is usually a single tandem dump load, but check the truck size with your supplier before booking delivery.
Millings coverage by depth
At 1.35 tons per cubic yard, one ton is 0.74 yd³, or 20 cubic feet.
| Depth | Sq ft per ton | Tons per 100 sq ft | Tons for 12 × 50 ft drive |
|---|---|---|---|
| 2 in | 120 | 0.83 | 5.0 |
| 3 in | 80 | 1.25 | 7.5 |
| 4 in | 60 | 1.67 | 10.0 |
| 6 in | 40 | 2.50 | 15.0 |
These are net figures before the 10% allowance. Wet or fines-heavy loads weigh more per yard, so the same tonnage covers a little less ground.
How to measure for millings
- Measure the finished width. Most single-lane drives are 10 to 12 ft. Measure at several points and average if the edges wander.
- Measure length along the centerline. For a curved drive, walk a tape down the middle.
- Pick a depth for the base you have. Over an existing compacted gravel drive, 2 to 3 inches is a common resurfacing depth. Over soil, plan on 4 to 6 inches in two lifts.
- Add turnarounds and aprons separately. Run each rectangle on its own and add the tons together.
Installing millings so they bind
Millings act like gravel when they arrive. Spread them evenly with a skid steer or rake, keeping a slight crown in the middle so water sheds to the edges. Then compact them with a vibratory roller or heavy plate compactor while the weather is warm.
Some owners lightly wet the surface before rolling to help the fines settle. Over the following weeks, traffic and heat press the old binder together into a firmer layer. Expect to top up low spots after the first season, especially where tires turn. A thin top-up of 1 to 2 inches is much cheaper than rebuilding the whole driveway later.
Common millings mistakes
- Ordering for compacted depth with no allowance. Loose millings lose height under a roller. Keep the 10% on, or raise depth slightly, so you finish at the thickness you planned.
- Skipping drainage. Millings shed water well once compacted, but a flat drive with no crown will puddle and rut. Build in a slight crown or cross-slope.
- Laying over mud. Millings on soft clay will push into the soil. Strip topsoil and add a compacted road base layer first if the ground is soft.
- Rolling in cold weather and expecting a hard surface. The binder needs warmth to knit. Plan the job for warm months where you can.
- Assuming every load is identical. Millings from different jobs vary in stone size and binder content. Ask whether the material is screened.
Related calculators
If you are weighing millings against new pavement, compare tonnage with the asphalt calculator. For an unpaved alternative, the gravel driveway calculator sizes layered stone, and the crushed concrete calculator covers another recycled base option.
Frequently asked questions
What are asphalt millings?
Millings, also called recycled asphalt pavement or RAP, are the chunks and fines ground off old roads when they are resurfaced. They are a mix of crushed stone and aged asphalt binder, sold by the ton, and usually cost much less per ton than new hot-mix asphalt.
How do millings compare to a paved asphalt driveway?
Millings are spread and compacted like gravel, so a homeowner with a plate compactor or roller can install them. They bind into a firm surface but never become the smooth, sealed mat that new hot-mix forms, so expect occasional regrading and top-ups. New asphalt costs more but is smoother and longer lasting.
Do asphalt millings need heat to compact properly?
Heat helps. The old binder softens a little on hot days, and traffic then presses the millings into a tighter layer. Spreading and rolling in warm weather gives a firmer surface sooner; a cold-weather install stays looser until summer.
How much do asphalt millings weigh per cubic yard?
This calculator uses 1.35 tons per cubic yard (2,700 lb), a reasonable figure for loose millings. Real loads range roughly from 1.2 to 1.6 tons per cubic yard depending on moisture, fines, and how much the pile has settled, so ask your supplier for their number on a large order.
How thick should a millings driveway layer be?
About 3 inches is common for a top layer over a sound existing gravel base. A driveway built over bare soil usually needs 4 to 6 inches, placed and compacted in two lifts. Heavier trucks and soft ground call for the thicker end.
How many tons of millings do I need per 100 sq ft?
At 1.35 tons per cubic yard, 100 sq ft at 3 inches is 25 cu ft, or 0.93 yd³, which weighs 1.25 tons. At 4 inches it is 1.67 tons, and at 6 inches 2.5 tons, before the optional 10% extra.
Estimates only. Verify quantities with your supplier before purchasing.