Asphalt tonnage comes from one formula: area (sq ft) × depth (ft) × 145 lb/ft³ ÷ 2,000. Coverage per ton is the same relationship flipped around, about 83 sq ft at 2 inches, 55 at 3 inches, 41 at 4 inches. Everything else in this guide, mix density, square yards, truckloads, compaction, builds on those two numbers.
Every asphalt quantity question, how many tons, how much area, how many truckloads, how much it'll shrink when it's rolled, traces back to the same compacted density figure: 145 pounds per cubic foot. This guide is the hub for that math: the core formula, a mix-type density table, coverage tables, unit conversions, and the truckload and compaction questions that come up once you have a tonnage number and need to actually plan the job. Each section links to a deeper walkthrough where one already exists on the site.
The asphalt tonnage formula (quick reference)
Tons = (Length ft × Width ft × Depth in ÷ 12) × 145 ÷ 2,000. Measure your area, convert depth from inches to feet, multiply by the density constant, then divide by 2,000 to convert pounds to tons. A 600 sq ft driveway at 3 inches deep works out to 600 × 0.25 × 145 ÷ 2,000, or about 10.9 tons, before adding a waste buffer.
- Measure the area. Length × width in feet.
- Convert depth to feet. Inches ÷ 12.
- Find the volume. Area × depth = cubic feet.
- Convert to weight. Volume × 145 lb/ft³.
- Convert to tons. Divide by 2,000, then add 5% to 10% for waste.
For the full step-by-step walkthrough with a worked example, the metric version, and a square-feet-to-tons reference table, see how to calculate asphalt tonnage. Or skip the manual math entirely: the free asphalt calculator runs this exact formula and adds cost estimating on top of it.
Asphalt density by mix type
The 145 lb/ft³ figure is a hot mix asphalt (HMA) standard, and it's the number to use for any structural driveway, parking lot, or road project. But not every asphalt product compacts to the same density, and using the wrong one throws off a tonnage calculation before you've even measured anything.
| Mix type | Compacted density | Typical use |
|---|---|---|
| Hot mix (HMA) | 145 lb/ft³ | Driveways, parking lots, roads — the structural standard |
| Warm mix (WMA) | ~145 lb/ft³ | Same density as HMA for planning purposes; applied at lower temperature |
| Cold mix (patch) | Lower and more variable than HMA | Pothole and crack patching only, not structural paving |
| Recycled millings (RAP) | 120 lb/ft³ | Budget driveways, base layers, temporary surfaces |
Warm mix asphalt uses the same aggregate and binder as hot mix, just applied at a lower temperature to cut fuel use and emissions, so use 145 lb/ft³ for WMA tonnage math the same as HMA. Cold mix asphalt, the bagged product used for pothole patching, has more air voids and a looser, less consistent density than either hot or warm mix. It's sold and applied in small enough quantities (a bag, a bucket, a few hundred pounds) that a precise density figure matters far less than it does for a full driveway pour, and it should never be substituted into a structural tonnage calculation. Recycled asphalt millings compact to about 120 lb/ft³, lighter than hot mix, which is one reason a ton of millings stretches slightly further than a ton of hot mix at the same thickness. See asphalt millings cost for pricing and installation detail.
Density and cost: why mix type affects your budget, not just your order
Density and price move together in a way that's easy to miss when you're focused on tonnage alone. A lighter material, like recycled millings at 120 lb/ft³ against hot mix's 145, means fewer tons are needed to fill the same area, which compounds with millings' lower per-ton price to make the total material cost drop faster than the density difference alone suggests. The reverse applies too: if a supplier's mix runs denser than the 145 lb/ft³ planning figure, expect a slightly higher tonnage, and a slightly higher total, than the calculator's default assumption. Once you have a tonnage figure from this guide, the asphalt cost calculator turns it into a full price using current 2026 regional pricing by mix type, so the density and cost sides of the estimate stay consistent with each other instead of coming from two different assumptions.
Coverage per ton: quick reference
Coverage is the tonnage formula in reverse: instead of solving for weight from an area, you're solving for area from a fixed weight. One ton of hot mix asphalt covers about 83 sq ft at 2 inches, 55 sq ft at 3 inches, and 41 sq ft at 4 inches. Coverage drops as depth increases, since the same 2,000 lbs spreads over less area the thicker you lay it.
| Compacted depth | Coverage per ton |
|---|---|
| 2 inches | 83 sq ft |
| 3 inches | 55 sq ft |
| 4 inches | 41 sq ft |
| 6 inches | 28 sq ft |
For the full table down to 1 inch, the square-yard equivalents, and the one-line coverage formula (166 ÷ depth in inches), see how much does a ton of asphalt cover.
Square yards to tons conversion
This section works as a standalone asphalt unit converter between square yards and tons. Commercial specs and road crews often work in square yards instead of square feet. One square yard of compacted hot mix asphalt weighs about 110 lbs per inch of thickness, the same industry-standard figure the asphalt square yardage calculator uses. The conversion formula is: Tons = (Square yards × Depth in inches × 110) ÷ 2,000.
| Area | 2 in deep | 3 in deep | 4 in deep |
|---|---|---|---|
| 100 sq yd | 11.0 tons | 16.5 tons | 22.0 tons |
| 500 sq yd | 55.0 tons | 82.5 tons | 110.0 tons |
| 1,000 sq yd | 110.0 tons | 165.0 tons | 220.0 tons |
A 1,000 square yard commercial overlay at 2 inches, for example, needs 1,000 × 2 × 110 ÷ 2,000, or about 110 tons. This is the same relationship as the square-foot formula, just scaled by 9 (one square yard equals 9 square feet), so both approaches agree once you convert units consistently.
How many truckloads of asphalt do you need?
Once you have a total tonnage figure, the next practical question is how many truck deliveries that translates to. Dump truck capacity varies by axle configuration and state weight limits, but the typical ranges are:
| Truck type | Typical capacity | Common use |
|---|---|---|
| Single-axle | 6 to 8 tons | Small residential driveways, tight access sites |
| Tandem-axle | 12 to 16 tons | Standard driveway and small commercial jobs |
| Tri-axle | 18 to 22 tons | Larger driveways, parking lots, road work |
These are typical ranges; exact capacity depends on the specific truck, axle spacing, and the state's gross vehicle weight limits, so treat them as planning figures rather than a guarantee for any one supplier's trucks. For a 50 by 12 ft driveway needing about 11.5 to 12 tons, that's one full tandem-axle load, or roughly two single-axle loads if that's what a smaller contractor has available. A 1,000 sq ft commercial lot at 2 inches (about 12 tons) fits the same way. Scale up to a full parking lot, and the same math tells you whether you're looking at one tri-axle delivery or several, which matters for scheduling a crew around delivery windows.
Truckload count matters beyond just logistics, too. Hot mix loses heat during transport, so suppliers and crews plan around delivery timing, not just total tonnage, especially on larger jobs that need multiple loads back to back. A driveway that fits in one delivery is straightforward to schedule; a parking lot needing four or five tri-axle loads means the paving crew is working against the clock on each truck to get material down and rolled before it cools too much to compact properly. Knowing your truckload count ahead of time, not just your tonnage, is what turns a tonnage estimate into a schedule a contractor can actually plan around.
Compaction: why loose volume isn't delivered volume
The 145 lb/ft³ figure this entire guide runs on is the compacted density, meaning asphalt that's already been rolled. Loose mix straight off the truck weighs about 10% to 20% less per cubic foot than that until it's been compacted, because loose material has more air pockets between the aggregate particles. This is why asphalt looks like more material when it's dumped than it does once the roller has gone over it, and it's also why using a loose-density figure instead of a compacted one is one of the most common tonnage calculation mistakes.
In practice this doesn't change your order quantity: suppliers sell by weight (tons), not by loose volume, so the tonnage formula already accounts for the compacted result you're trying to achieve. It matters most for paving crews figuring out how thick to spread material before rolling it (a common rule of thumb is to spread loose mix noticeably thicker than the target compacted depth so the roller has enough material to work with), and it explains why a delivery that looks generous on the ground can compact down to exactly the depth that was ordered.
Two worked examples, start to finish
Take a 40 by 20 ft driveway (800 sq ft) at the standard 3 inch residential depth. Working through every step this guide covers:
- Tonnage: 800 sq ft × 0.25 ft × 145 lb/ft³ ÷ 2,000 = 14.5 tons
- With waste buffer (7%): about 15.5 tons to order
- In square yards: 800 ÷ 9 = 88.9 sq yd, cross-checked against 88.9 × 3 × 110 ÷ 2,000 = 14.7 tons (matches, within rounding)
- Truckloads: one tandem-axle load (12–16 tons) covers this in a single delivery
- Density check: this uses the 145 lb/ft³ hot mix figure; a millings driveway at 120 lb/ft³ would need proportionally less weight for the same coverage
Now scale it up to a small commercial lot: 15,000 sq ft at the typical 4 inch commercial depth.
- Tonnage: 15,000 sq ft × 0.333 ft × 145 lb/ft³ ÷ 2,000 = 362.6 tons
- With waste buffer (5%): about 381 tons to order
- In square yards: 15,000 ÷ 9 = 1,666.7 sq yd, cross-checked against 1,666.7 × 4 × 110 ÷ 2,000 = 366.7 tons (matches, within rounding)
- Truckloads: at 18–22 tons per tri-axle load, that's roughly 17 to 21 deliveries, a multi-day paving schedule rather than a single-visit job
- Cost bridge: run this same tonnage through the asphalt cost calculator or the asphalt parking lot calculator to turn it into an installed price
That's the complete relationship this guide is built around: one density constant, one formula, and every other number, coverage, square yards, truckloads, is a direct consequence of it, whether the job is a single driveway or a multi-day commercial lot. Enter your own dimensions in the free asphalt calculator to get this same result without doing the arithmetic by hand.
Metric conversion
For metric specs, compacted hot mix asphalt has a density of about 2,322 kg/m³, and the formula becomes Tonnes = Length (m) × Width (m) × Depth (m) × 2.322. A metric tonne (2,205 lbs) is about 10% heavier than a US short ton (2,000 lbs), so don't mix the two when comparing a metric spec against a US supplier quote. For a full worked metric example, see the metric section of how to calculate asphalt tonnage.
Common calculation mistakes
- Mixing units. Keep everything in feet (or meters) before multiplying, or results come out off by a factor of 12.
- Using the wrong mix density. 145 lb/ft³ is for hot and warm mix; recycled millings run lighter at 120 lb/ft³.
- Forgetting the waste buffer. Order 5% to 10% over the raw formula result to cover compaction and edge work.
- Confusing loose and compacted figures. Always calculate from the compacted density; loose mix reads 10% to 20% lighter per cubic foot before rolling.
Skip the manual math. Enter your area, depth, and mix type and get tonnage, coverage, and cost in one step.
Open the asphalt calculatorAt a glance: the whole calculator guide in seven numbers
- 1145 lb/ft³ — compacted hot and warm mix density, the constant everything else in this guide is built on.
- 2120 lb/ft³ — compacted recycled millings density, lighter than hot mix.
- 383 / 55 / 41 sq ft — coverage per ton at 2, 3, and 4 inches.
- 40.054 — tons per square yard per inch of depth, the square-yard shortcut constant.
- 56–8 / 12–16 / 18–22 tons — typical single-axle, tandem-axle, and tri-axle truckload capacities.
- 610% to 20% — how much lighter loose asphalt reads per cubic foot before compaction.
- 75% to 10% — the waste buffer to add to any raw formula result before ordering.
Sources and citations
- National Asphalt Pavement Association — asphaltpavement.org
- Asphalt Institute — asphaltinstitute.org
- Asphalt Calculator (internal tool)
- Asphalt Parking Lot Calculator (internal tool)
- Asphalt Square Yardage Calculator (internal tool)
- How to Calculate Asphalt Tonnage (internal guide)
- How Much Does a Ton of Asphalt Cover (internal guide)
- How Much Does Asphalt Weigh (internal guide)
- Asphalt Millings Cost (internal guide)
Frequently asked questions
Tons = (Length ft × Width ft × Depth in ÷ 12) × 145 ÷ 2,000. Measure area in square feet, convert depth from inches to feet, multiply by the 145 lb/ft³ density constant, then divide by 2,000 to convert pounds to tons.
Hot mix and warm mix asphalt both use 145 lb/ft³ for planning purposes; warm mix just applies at a lower temperature. Cold mix, used for pothole patching, has more air voids and a looser, less consistent density, so it should not be used in structural tonnage calculations. Recycled millings compact to about 120 lb/ft³, lighter than either.
It depends on depth: one ton covers about 9.2 square yards at 2 inches, 6.1 square yards at 3 inches, and 4.6 square yards at 4 inches. The underlying constant is 0.054 tons per square yard per inch of depth.
A standard residential driveway needing 10 to 15 tons typically fits in a single tandem-axle load (12 to 16 tons capacity). Smaller jobs may use a single-axle truck (6 to 8 tons), and larger driveways or parking lots often need a tri-axle load (18 to 22 tons) or multiple deliveries.
Loose asphalt has air pockets between the aggregate particles that close up when a roller compacts it, so loose mix weighs about 10% to 20% less per cubic foot than the same material after rolling. This doesn't change your order quantity, since suppliers sell by weight, but it matters for figuring out how thick to spread material before compaction.
One cubic yard of compacted hot mix asphalt weighs about 1.96 tons (3,915 lbs), based on the standard 145 lb/ft³ density and 27 cubic feet per cubic yard. For quick estimating, round up to 2 tons per cubic yard.
Run the formula yourself and compare: your area in square feet times depth in feet times 145, divided by 2,000, plus a 5% to 10% waste allowance. A contractor's quote should land close to that after accounting for their stated waste factor. A number dramatically higher or lower than your own calculation is worth a direct question before you sign anything.
