Why does this calculator use a spread rate instead of a density?

Because that's the convention paving contractors and DOT estimators actually use for tonnage takeoffs: pounds per square yard per inch, multiplied directly by your area and thickness, with no cubic-yard step. This page also runs an equivalence check tying its 110 lb/sy/in default back to about 146.7 lb/ft³ — within about 1% of the roughly 145 lb/ft³ commonly published as a density elsewhere — so both conventions agree rather than looking like competing answers.

Should I enter loose or compacted thickness?

Compacted — the finished, rolled thickness, not the loose mix as it comes off the paver. The Asphalt Institute's rule of thumb is to set screed height at about 1.25× the compacted target for dense-graded mixes (a 25% roll-down allowance), so entering loose thickness instead will overstate your order by roughly that much.

Why do 106, 110, and 112 lb/sy/in all show up as "the" spread rate?

Because three real authorities publish three different figures for the same conversion: the Asphalt Institute's 110 is a general rule of thumb, Illinois DOT uses 112 for its own HMA quantity takeoffs, and Tennessee DOT uses 106 for most of its dense-graded mixtures. This page defaults to 110 and discloses the range rather than averaging the three into a number none of them actually publishes.

Why does a chart I found show asphalt at a much lower weight per cubic yard?

It's very likely describing loose reclaimed asphalt pavement (RAP) millings, which run around 2,700 lb/yd³, rather than compacted hot mix asphalt, which runs around 3,900 lb/yd³. They're different products — millings are ground-up recycled pavement, not fresh mix — not two competing figures for the same material.

Does this calculator work for open-graded or porous asphalt?

No, by design. Open-graded mixes run 15–20% air voids and weigh meaningfully less per square yard per inch than the dense-graded mixes this calculator covers — Tennessee DOT's 88 lb/sy/in for Open-Graded Friction Course and Indiana DOT's 100 lb/sy/in for open-graded drainage layers are real examples. Use your mix design's or DOT's stated rate for those mixes instead.

Does every asphalt mix weigh the same?

No. Stone matrix asphalt (SMA), designed for durability under heavy loads, runs denser than this page's dense-graded default. Open-graded and porous mixes, designed to let water drain through, run lighter — see the open-graded question above. If your supplier or contractor states a density or spread rate for your specific mix, use that instead of this page's general figures.

How thick should my driveway be paved?

This calculator doesn't say, deliberately. Pavement thickness is engineering design under traffic loading — it depends on load, subgrade condition, and local specification. Illinois DOT's own design tables state that all thicknesses are determined by the Pavement Design Engineer; for a driveway, check with your paving contractor or local building department rather than assuming a generic number.

Can asphalt be paved any time of year?

No — hot mix asphalt needs a minimum air and ground temperature to compact properly and bond as it cools, which makes paving seasonal work in most climates. Check with your paving contractor about the timing window in your area before planning around a specific date.

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Asphalt Calculator

Asphalt tonnage can be estimated two different ways, and this calculator uses the one paving contractors and DOT estimators actually work in: a spread rate, not a density. A spread rate states how many pounds of mix cover one square yard at one inch of thickness — 110 lb/sy/inch is the Asphalt Institute's own rule of thumb for dense-graded hot mix asphalt — and multiplying that rate by your area and compacted thickness gives tonnage directly, without ever computing a cubic-yard volume. Enter your paving area and your compacted thickness — the finished, rolled thickness, not the loose mix as it comes off the paver — in either imperial or metric units, and this calculator returns the tonnage to order. It covers dense-graded mixes only; open-graded and gap-graded mixes use meaningfully different rates, covered in the guidance below. A separate equivalence check ties this page's spread-rate figure back to the roughly 145 lb/ft³ density commonly published elsewhere, so the two conventions reconcile rather than look like a disagreement.

Your paving area

LengthWidthUnit

Compacted thickness

The finished, rolled thickness — not the loose mix as it comes off the paver. See the guidance below for the compacted-vs-loose roll-down allowance.

Spread rate (lb/sy/in)

110 lb per square yard per inch is the Asphalt Institute's own rule of thumb for establishing total tonnage on a dense-graded hot mix asphalt job — the default here because it's the general-purpose, trade-body figure, not because it splits the difference between the other two. Illinois DOT states 112 lb/sy/in as the unit weight it uses to calculate all HMA surface mixture quantities. Tennessee DOT uses 106 lb/sy/in for most of its dense-graded mixtures, per the Asphalt Institute source. These three don't describe the same material varying by moisture or supplier — they're three real authorities independently stating three numbers for the same governing conversion, and averaging them would invent a fourth number none of the three actually publishes. Use your own state DOT's or mix design's figure if one applies to your job; otherwise 110 is a reasonable general default. This is a genuinely different kind of range from the 1.92–2.00 tons/yd³ figure below — see the guidance for why the two are never presented as one range.

Waste (%)Covers edges, joints, and handwork — not compaction, which is already accounted for because the thickness you enter is compacted thickness, not loose. Increase for an irregular lot shape or a job with a lot of edge-cutting.

Enter your paving area above to see results.

How it's calculated

The calculator converts your area from square feet to square yards (÷9), then multiplies by your compacted thickness in inches and the spread rate (110 lb/sy/inch by default) to get a base weight in pounds — no cubic-foot or cubic-yard step at any point, since a spread rate already combines area, thickness, and density into one figure. A waste percentage is added on top (5% by default, covering edges, joints, and handwork — not compaction, which the compacted-thickness input already accounts for), and the adjusted weight is divided by 2,000 to get tons, the unit asphalt is actually sold and invoiced in. Both area and thickness support imperial or metric units; the underlying math always runs in square yards and inches regardless of what you enter.

Worked example

A 900 sq ft driveway, 2 inches compacted, at the 110 lb/sy/in default and 5% waste: area in square yards = 900 ÷ 9 = 100 yd². Base weight = 100 × 2 × 110 = 22,000 lb, or 11.0 tons. Adding 5% waste: 22,000 × 1.05 = 23,100 lb, or 11.55 tons — the amount to order. A larger 1,200 sq ft lot at 3 inches compacted, same defaults: area = 1,200 ÷ 9 = 133.3 yd²; base weight = 133.3 × 3 × 110 = 44,000 lb, or 22.0 tons before waste; 46,200 lb, or 23.1 tons, after 5% waste.

Compacted vs. loose, why figures conflict, and what's out of scope

This calculator asks for compacted thickness, not loose thickness, and mixing the two up is the most common way a tonnage estimate comes out wrong. Hot mix asphalt is struck off loose behind the paver and consolidates under rolling, so the loose thickness on the ground is always more than the finished, compacted thickness. The Asphalt Institute's own rule of thumb is to set screed height at roughly 1.25 times the target compacted thickness for dense-graded mixes — a 25% allowance for roll-down — so 3 inches compacted goes down at roughly 3.75 inches loose. Gap-graded and open-graded materials roll down less, since they carry more air voids to begin with: the Asphalt Institute's rule of thumb for those is a 15% allowance, or roughly 1.15 times the compacted thickness. If you enter loose thickness into this calculator instead of the finished, compacted target, you'll overshoot the order.

Published asphalt weight figures often look like they contradict each other, and the reason is almost always that they're describing two different products, not disputing the same one. Compacted hot mix asphalt — the finished, rolled mat this calculator computes tonnage for — runs about 3,900 lb per cubic yard. Loose reclaimed asphalt pavement (RAP) millings, ground-up recycled pavement rather than fresh mix, run closer to 2,700 lb per cubic yard. A figure you've seen elsewhere that looks much lower than this page's numbers is very likely describing millings or loose material, not the same compacted product measured differently.

This page's 110 lb/sy/in default converts to a density for anyone cross-checking against a cubic-yard figure: one square yard at one inch of thickness is 0.75 cubic feet (9 sq ft × 1/12 ft), so 110 lb/sy/in ÷ 0.75 ft³ = 146.7 lb/ft³ — which comes to about 3,960 lb per cubic yard, or 1.98 tons/yd³. That reconciles closely with two independent, real sources for compacted HMA density: the Asphalt Institute's Engineering FAQ states 142 to 148 lb/ft³ (its own worked example uses the conservative 148 lb/ft³ end), and Iowa DOT's Materials Manual states approximately 145 lb/ft³. All of these land within about 1% of each other — 146.7 lb/ft³ from the spread rate, roughly 145 lb/ft³ from two independent density sources — which is why this page treats the spread rate and the density figure as the same underlying material described two conventional ways, not two competing answers.

The 110 lb/sy/in figure itself isn't the only number in circulation, and the disagreement between real sources is worth stating plainly rather than smoothing over. The Asphalt Institute's 110 is a general rule of thumb. Illinois DOT states 112 lb/sy/in as the unit weight it uses for all HMA surface mixture quantities on its own projects. Tennessee DOT uses 106 lb/sy/in for most of its dense-graded mixtures. These aren't measurement noise the way a material's density might vary by moisture — they're three real authorities independently choosing three different numbers for the same governing conversion. This page defaults to 110 because it's the general-purpose figure, discloses 106–112 as the documented range, and doesn't average the three into an invented fourth number. If your own state DOT or mix design states a figure, use that instead.

This page carries two different ranges, and they exist for two genuinely different reasons — worth stating explicitly so they're never mistaken for one range split two ways. The 106–112 lb/sy/in spread-rate range is real authorities specifying different values for the same governing conversion, described above. The 1.92–2.00 tons/yd³ density range in the equivalence check above is the ordinary kind of spread this site shows everywhere else: real physical variance in compacted mix density, the same category as a gravel or sand density range. One is institutional disagreement; the other is material variance. They land close to each other numerically, which is exactly why they're easy to blend together by mistake — don't.

Open-graded mixes are excluded from this calculator entirely, and that's a scope decision, not an oversight. The Asphalt Institute source describes open-graded mixes as running 15 to 20% air voids — deliberately porous, to let water drain through — which is exactly why they weigh less per square yard per inch than a dense-graded mix. Tennessee DOT uses 88 lb/sy/inch for Open-Graded Friction Course; Indiana DOT uses 100 lb/sy/inch for open-graded drainage layers. Using this calculator's dense-graded default for either would overstate the tonnage needed. Mix design changes the density-equivalence figure too: stone matrix asphalt (SMA), designed for durability under heavy loads, runs denser than the dense-graded default; open-graded and porous mixes run lighter for the same reason they need a different spread rate. If your supplier or contractor states a density or spread rate for your specific mix, use that instead of this page's defaults — a stated mix figure always beats a general one.

What thickness your driveway or lot should actually be paved to isn't something this calculator states, and that's deliberate. Pavement thickness is engineering design under traffic loading — it depends on the load the surface will carry, the subgrade's condition, and local specification, not a generic rule. Illinois DOT's own mix selection tables put it plainly: all thicknesses are determined by the Pavement Design Engineer. For a driveway, general contractor practice can inform a starting conversation, but it's still practice, not a specification — check with your paving contractor or local building department for the actual number.

Paving is seasonal work in most climates, too: hot mix asphalt needs a minimum air and ground temperature to compact properly and bond as it cools, which is why paving contractors generally won't schedule a job outside a specific temperature window. Check with your contractor about timing before planning around a specific date — this calculator only converts the area, thickness, and rate you enter into a tonnage, not a paving schedule.

Common mistakes

Entering loose thickness instead of compacted thickness. This calculator computes tonnage from the finished, rolled thickness — loose mix behind the paver runs roughly 15–25% thicker than that, depending on the mix, and using the loose number overshoots the order.
Comparing this page's tonnage to a much lower figure and assuming one of them is wrong. A lower number elsewhere is very likely describing loose RAP millings (about 2,700 lb/yd³) rather than compacted hot mix asphalt (about 3,900 lb/yd³) — two different products, not a disputed density.
Averaging the 106, 110, and 112 lb/sy/in figures into a single "true" number. They're three real authorities' independently stated figures for the same conversion, not measurement variance — use your own DOT's or mix design's figure if one applies, or the 110 default otherwise.
Blending the 106–112 lb/sy/in spread-rate range with the 1.92–2.00 tons/yd³ density range as if they were one range. They're two different kinds of spread — institutional disagreement versus ordinary material variance — and this page keeps them separate on purpose.
Using this calculator's dense-graded rate for an open-graded or gap-graded mix. Open-graded mixes run 15–20% air voids and weigh meaningfully less per square yard per inch — Tennessee DOT's 88 lb/sy/in for Open-Graded Friction Course and Indiana DOT's 100 lb/sy/in for open-graded drainage layers are real, lower, mix-specific figures this calculator doesn't compute.
Assuming a driveway or lot's thickness without checking with a paving contractor or local specification. Thickness is engineering design under traffic loading, not a generic number — this calculator only converts the thickness you enter into a tonnage.
Treating the 5% waste default as covering compaction. It doesn't, and doesn't need to — compaction is already handled because the input is compacted thickness. The 5% is for edges, joints, and handwork only.
Scheduling a pour without checking the paving season. Hot mix asphalt needs a minimum air and ground temperature to compact and bond properly, which makes paving seasonal work in most climates.

FAQ

Why does this calculator use a spread rate instead of a density?: Because that's the convention paving contractors and DOT estimators actually use for tonnage takeoffs: pounds per square yard per inch, multiplied directly by your area and thickness, with no cubic-yard step. This page also runs an equivalence check tying its 110 lb/sy/in default back to about 146.7 lb/ft³ — within about 1% of the roughly 145 lb/ft³ commonly published as a density elsewhere — so both conventions agree rather than looking like competing answers.
Should I enter loose or compacted thickness?: Compacted — the finished, rolled thickness, not the loose mix as it comes off the paver. The Asphalt Institute's rule of thumb is to set screed height at about 1.25× the compacted target for dense-graded mixes (a 25% roll-down allowance), so entering loose thickness instead will overstate your order by roughly that much.
Why do 106, 110, and 112 lb/sy/in all show up as "the" spread rate?: Because three real authorities publish three different figures for the same conversion: the Asphalt Institute's 110 is a general rule of thumb, Illinois DOT uses 112 for its own HMA quantity takeoffs, and Tennessee DOT uses 106 for most of its dense-graded mixtures. This page defaults to 110 and discloses the range rather than averaging the three into a number none of them actually publishes.
Why does a chart I found show asphalt at a much lower weight per cubic yard?: It's very likely describing loose reclaimed asphalt pavement (RAP) millings, which run around 2,700 lb/yd³, rather than compacted hot mix asphalt, which runs around 3,900 lb/yd³. They're different products — millings are ground-up recycled pavement, not fresh mix — not two competing figures for the same material.
Does this calculator work for open-graded or porous asphalt?: No, by design. Open-graded mixes run 15–20% air voids and weigh meaningfully less per square yard per inch than the dense-graded mixes this calculator covers — Tennessee DOT's 88 lb/sy/in for Open-Graded Friction Course and Indiana DOT's 100 lb/sy/in for open-graded drainage layers are real examples. Use your mix design's or DOT's stated rate for those mixes instead.
Does every asphalt mix weigh the same?: No. Stone matrix asphalt (SMA), designed for durability under heavy loads, runs denser than this page's dense-graded default. Open-graded and porous mixes, designed to let water drain through, run lighter — see the open-graded question above. If your supplier or contractor states a density or spread rate for your specific mix, use that instead of this page's general figures.
What does the 5% waste default cover?: Edges, joints, and handwork — not compaction. Compaction is already built into the calculation because the thickness you enter is compacted thickness, not loose. Increase the waste percentage for an irregular lot shape or a job with a lot of edge-cutting.
How thick should my driveway be paved?: This calculator doesn't say, deliberately. Pavement thickness is engineering design under traffic loading — it depends on load, subgrade condition, and local specification. Illinois DOT's own design tables state that all thicknesses are determined by the Pavement Design Engineer; for a driveway, check with your paving contractor or local building department rather than assuming a generic number.
Can asphalt be paved any time of year?: No — hot mix asphalt needs a minimum air and ground temperature to compact properly and bond as it cools, which makes paving seasonal work in most climates. Check with your paving contractor about the timing window in your area before planning around a specific date.