Estimate asphalt volume, tonnage, and optional cost with unit conversions, wastage, density, and compaction controls.
How this calculator works
Compacted volume × mix density gives tonnage — most paving is sold by the ton.
cubic_feet = length × width × thickness × (1 + wastage%) × (1 + compaction%)tons = (cubic_feet × density_lb_per_ft3) ÷ 2000cubic_yards = cubic_feet ÷ 27
- Hot-mix asphalt ≈ 145 lb/ft³ is the safe default. Stone-mastic mixes run heavier (≈ 150); cold-mix runs lighter (≈ 140).
- Driveways are usually 2–3″ compacted. Heavy-traffic surfaces want 4″+ over a properly compacted base.
Common questions
How thick should my asphalt be?
Residential driveways: 2–3″ of compacted hot-mix over a properly prepared 6–8″ granular base. Commercial parking and any surface that'll see truck traffic: 4″+ asphalt over 8–12″ base, sometimes with a binder course.
Why does the calculator ask for density?
Asphalt is sold by the ton, but you measure your job in volume. Density (mass per unit volume) is the conversion factor. 145 lb/ft³ is the safe default for standard hot-mix; specialty mixes vary.
Should I set a compaction factor?
Default flow: enter the finished, compacted thickness (the depth you actually want after rolling) and leave the compaction factor at 0%. The 145 lb/ft³ density figure already represents compacted hot-mix, so the tonnage math comes out right. Escape hatch: if your supplier quotes loose tonnage instead of compacted, set the compaction factor to about 25%. Loose asphalt compacts roughly 20–25% during rolling, so a 25% bump on the volume side closes the gap.
The math on an asphalt order isn’t hard, but the cost of being wrong is loud: order short and your crew is standing around watching the truck head back to the plant; order long and the surplus cools in the box, drops out of spec, and you’re either paying disposal or laying material that won’t compact to density. This calculator returns both the volume that physically fits the lift and the tonnage you actually order, so the conversation with the plant starts from a defensible figure.
What the calculator returns
Enter paving length, width, and target compacted depth, then tune three planning factors: a density assumption (defaults to 145 lb/ft³ for hot-mix surface course), a wastage percentage for cuts and short-load buffer, and a compaction factor that defaults to 0%. The calculator returns base volume, tonnage at the ordered density, and, if you supply a price per ton, an estimated material cost.
Compacted depth vs loose tonnage
The standard flow assumes the depth you enter is the finished, compacted thickness — the depth you actually want after rolling — and the 145 lb/ft³ density figure represents compacted hot-mix. That combination produces the right tonnage and you leave the compaction factor at 0%. If your supplier quotes loose tonnage instead of compacted (some smaller plants do), set the compaction factor to about 25%. Loose asphalt compresses roughly 20–25% during rolling, so a 25% bump on the volume side closes the gap. The wastage percentage is separate from compaction; it covers cuts, edges, and short-load fees, not the loose-to-compacted conversion.
A sample driveway
Say you’re paving a 100 ft × 12 ft driveway at 2 inches compacted depth. Volume is length × width × depth, normalised to cubic feet:
Convert to tons at 145 lb/ft³ and divide by 2,000:
Add 10% wastage and the order tonnage is:
At $115 per ton the plant’s quote should land near $1,800 plus haul. Most plants charge a short-load fee under five tons, so any residential pour wants to know its real number before the call.
Where the calculator runs out of road
This is a single-lift, rectangular-area calculator. It handles driveways, walkways, small parking pads, and patches well. It is not the right tool for multi-lift jobs (binder + surface course) where each lift has its own density and depth, sloped or crowned cross-sections, or anywhere compaction QC drives the spec. For those, calculate each lift separately or hand the geometry to your paving contractor.
Why 145 lb/ft³ — and when to override it
145 lb/ft³ is the working number most plants quote for compacted hot-mix surface course; it lines up with the typical range cited in NAPA and provincial paving specs. Binder course usually runs 142-145; recycled-asphalt blends can run lower (130-138). Ask your plant for their actual figure — they all have one, and a 5 lb/ft³ swing on a parking-lot pour moves the order by three tons or more.
The two formulas to take away:
One ton of compacted hot-mix covers roughly 80 sq ft at 2 in depth, or 160 sq ft at 1 in. Haul, fuel surcharges, and short-load fees are not included — confirm those with your plant. If you’re scoping a multi-lift driveway, a parking lot, or anything where compaction QC matters more than the math, a sit-down with a paving contractor who can walk the subgrade is usually cheaper than getting the spec wrong.
Other calculators on this site
If you’re scoping a whole project, you’ll usually need more than one of these. They share the same approach — plain math, honest about edge cases, with the practical notes someone who has done the work would actually need.
- Concrete Pour Calculator. Cubic yards of concrete for a slab, footing, or post hole, plus the waste factor most pours actually need.
- Drywall Calculator. Sheets of drywall and bundles of mud for a renovation room, plus the cut and waste allowance.
- Excavation Calculator. Cubic yards of dirt to remove for a basement, pool, or footing — including the bulking factor that surprises first-timers.
- Fence Calculator. Lineal feet of fence, post count, rails, and gates for a property line that is rarely perfectly straight.
- Fill Calculator. Cubic yards of fill for a regrade, a backyard level, or a low spot, plus a sensible compaction factor.
- Lumber Calculator. Board feet for a deck, frame, or addition, in the rough framing pattern a supplier will price against.
- Paint Calculator. Gallons of paint for a room, plus the coverage difference between primed and unprimed surfaces.
- Tile Calculator. Square footage of tile for a floor or wall, plus the breakage and cut waste a real installation needs.
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