Why does this calculator's asphalt weight not match a chart I found elsewhere?

Charts showing asphalt around 2,700 lb per cubic yard are almost always describing loose mix or milled/reclaimed asphalt (RAP), not the compacted, in-place mat. This calculator computes compacted tonnage — about 3,915 lb (1.96 tons) per cubic yard — which is what your paving contractor orders and what the scale house weighs.

Should I use the compacted or loose weight to order asphalt?

Compacted. That's the finished driving surface after paving and rolling, and it's the number your contractor's invoice and the scale house both use. Loose asphalt straight off the truck weighs meaningfully less for the same volume, since it hasn't been compressed yet.

What's the difference between asphalt, loose mix, and millings or RAP?

Compacted, in-place asphalt runs about 145 lb/ft³ — the finished mat. Loose asphalt, before it's spread and rolled, runs about 117 lb/ft³. Millings, or reclaimed asphalt pavement (RAP), are ground-up recycled pavement, a different product entirely, running roughly 120 to 140 lb/ft³. This calculator computes the compacted figure.

How thick should my driveway or parking lot be?

It depends on the traffic load the surface will carry, your subgrade's condition, and your local specification or contractor's standard practice — not a generic number. Check with your paving contractor or local specification before ordering; this calculator only converts the thickness you enter into a tonnage.

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 is different from every other material on this site in one important way: state of compaction changes the weight by roughly 25%, and most calculators don't say which state they mean. This one computes compacted, in-place tonnage — the finished driving surface, what you order and what the scale house weighs — not the loose mix off the truck or reclaimed millings, which weigh meaningfully less for the same volume. Asphalt is sold by the ton, not the cubic yard, so the tonnage this calculator returns is the number to bring to your paving contractor. Enter your area, pick a lift thickness — or tap a preset for a common depth — and the results update as you type. What thickness your specific driveway or lot needs isn't something this calculator decides; that depends on traffic load, subgrade, and local specification, covered in the guidance below. Paving is seasonal work too, which the guidance also explains.

Your area

Shape

LengthWidthUnit

Depth

QuantityMultiplies the volume below — use this for multiple identical holes, footings, or beds instead of running the calculator once per unit.Waste (%)Covers compaction variance and edge trim. Increase for an irregular lot shape or a job with a lot of edge-cutting.

Price (optional)

Enter your dimensions above to see results.

How it's calculated

The calculator first finds the volume of the area in cubic feet: length (ft) × width (ft) × depth (in ÷ 12). That's converted to cubic yards by dividing by 27, since a cubic yard is 3 ft × 3 ft × 3 ft. A waste percentage is added on top to cover compaction variance and edge trim, and the adjusted cubic yardage is multiplied by asphalt's compacted, in-place density (tons per cubic yard) to get the weight in tons — the number you actually order, since asphalt is sold by the ton, not the yard.

Worked example

A 12 ft × 40 ft driveway paved 3 inches thick: volume = 12 × 40 × (3 ÷ 12) = 120 cubic feet. In cubic yards, that's 120 ÷ 27 = 4.44 yd³. Adding a 10% waste factor: 4.44 × 1.10 = 4.89 yd³. At 1.96 tons per cubic yard, that's 4.89 × 1.96 = 9.58 tons — or 9.39–9.78 tons across the 1.92–2.00 density range. That's the compacted, in-place tonnage to order from your paving contractor — not the loose weight off the truck, which would be lighter for the same volume.

How deep should it be?

Compaction state is the single biggest source of confusion in asphalt estimating, and it's worth understanding before you compare this calculator's numbers to anything else you've seen. This calculator computes compacted, in-place tonnage — the finished mat after a paver and roller have done their work, at about 145 lb/ft³ (1.96 tons/yd³). That's the number your paving contractor orders and the number the scale house weighs the truck against. Loose asphalt straight off the truck, before it's spread and rolled, weighs meaningfully less — about 117 lb/ft³, or roughly 1.58 tons/yd³ — because it hasn't been compressed yet. Millings, or reclaimed asphalt pavement (RAP), are a different product entirely, ground-up recycled pavement rather than fresh mix, running roughly 120 to 140 lb/ft³. If you've seen a much lower figure elsewhere — a general material weight chart listing asphalt around 2,700 lb per cubic yard is common — that figure is almost certainly describing loose material or millings, not the compacted mat this calculator and your contractor's invoice both mean; it isn't a different, more accurate number, it's answering a different question. The Asphalt Institute's own worked example for this conversion uses 148 lb/ft³, the high end of their stated 142–148 range, deliberately: estimating light and coming up short mid-job is a worse outcome than ordering a bit extra, so the industry's own convention leans conservative. Mix design changes the answer too, sometimes significantly — open-graded and porous mixes, designed to let water drain through, are lighter than a standard dense-graded mix, while stone matrix asphalt (SMA), designed for durability under heavy loads, runs denser. If your supplier or contractor states a density for your specific mix, use that instead of this page's default; a stated mix density is always more accurate than a generic range. What thickness your driveway or lot actually needs isn't a number this calculator supplies: it depends on the traffic load the surface will carry, your subgrade's condition and preparation, and your local specification or contractor's standard practice for the application — check with your paving contractor or local specification rather than assuming a generic lift thickness. 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.

Common mistakes

Comparing this calculator's tonnage to a generic material weight chart showing asphalt around 2,700 lb per cubic yard. That figure describes loose or milled material, not the compacted, in-place mat this calculator and your contractor's invoice both mean.
Assuming a driveway or lot's thickness without checking with a paving contractor or local specification. Thickness depends on traffic load, subgrade, and local practice — not a number a generic calculator should guess at.
Using a generic density default when your supplier or contractor has already stated the density for your specific mix. Open-graded and porous mixes run lighter, stone matrix asphalt runs denser — a stated mix density always beats this page's general range.
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.
Measuring loose asphalt depth instead of the compacted lift thickness. Asphalt is spread thicker than its final compacted depth and then rolled down — order and measure based on the finished, compacted thickness.

Where the density figure comes from

This is the site's first density sourced partly to a state government agency — Iowa DOT's Materials Manual — alongside a national trade authority, the Asphalt Institute. Both describe the same thing: compacted, in-place hot mix asphalt, the finished driving surface after a paver and roller have done their work. The Asphalt Institute states asphalt mixture typically weighs 142 to 148 lb/ft³ in place, and its own worked example uses 148 lb/ft³, the conservative high end, so an estimate doesn't come up short at the scale house. Iowa DOT states compacted hot mix asphalt density at approximately 145 lb/ft³, and notes that achieving high density in the finished pavement is essential to long-term performance — density isn't just a units-conversion number to a DOT, it's a construction quality target. Both figures land within a few pounds of 145 lb/ft³ (3,915 lb, or 1.96 tons, per cubic yard), the display figure used here. The published 1.92–2.00 ton/yd³ range covers that 142–148 lb/ft³ span. Compaction state changes this answer by roughly 25%, more than any other material on this site, and most calculators don't say which state they mean: this one computes compacted, in-place tonnage, not loose mix off the truck (about 117 lb/ft³, ~1.58 tons/yd³) or millings/RAP (roughly 120–140 lb/ft³) — see the guidance below for why a figure you've seen elsewhere may not match. We use 1.96 tons/yd³ as the display figure, drawn from:

FAQ

Why does this calculator's asphalt weight not match a chart I found elsewhere?: Charts showing asphalt around 2,700 lb per cubic yard are almost always describing loose mix or milled/reclaimed asphalt (RAP), not the compacted, in-place mat. This calculator computes compacted tonnage — about 3,915 lb (1.96 tons) per cubic yard — which is what your paving contractor orders and what the scale house weighs.
Should I use the compacted or loose weight to order asphalt?: Compacted. That's the finished driving surface after paving and rolling, and it's the number your contractor's invoice and the scale house both use. Loose asphalt straight off the truck weighs meaningfully less for the same volume, since it hasn't been compressed yet.
What's the difference between asphalt, loose mix, and millings or RAP?: Compacted, in-place asphalt runs about 145 lb/ft³ — the finished mat. Loose asphalt, before it's spread and rolled, runs about 117 lb/ft³. Millings, or reclaimed asphalt pavement (RAP), are ground-up recycled pavement, a different product entirely, running roughly 120 to 140 lb/ft³. This calculator computes the compacted figure.
Why does the Asphalt Institute use 148 lb/ft³ instead of the middle of its range?: Their stated range is 142 to 148 lb/ft³, and their own worked example uses the high end deliberately: estimating light and coming up short mid-job is a worse outcome than ordering a bit extra, so the industry's own convention for this calculation leans conservative rather than splitting the difference.
How thick should my driveway or parking lot be?: It depends on the traffic load the surface will carry, your subgrade's condition, and your local specification or contractor's standard practice — not a generic number. Check with your paving contractor or local specification before ordering; this calculator only converts the thickness you enter into a tonnage.
Does every asphalt mix weigh the same?: No. Open-graded and porous mixes, designed to let water drain through, run lighter than a standard dense-graded mix. Stone matrix asphalt (SMA), designed for durability under heavy loads, runs denser. If your supplier or contractor states a density for your specific mix, use that instead of this page's general range.
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.