Asphalt Tonnage Calculator: Square Feet to Tons Formula
I built this asphalt tonnage calculator to show its work. In 15 years of plant ordering I have never once used a tool that hid the math, and I'd never recommend one to a contractor either. The formula is area × thickness × density ÷ 2,000; the shortcut I keep on my desk for 145 lb/ft³ HMA is tons = ft² × depth(in) × 0.00604. Enter dimensions below or scan the conversion tables I use on real jobs.
What this tonnage calculator gives you:
- Tons of hot mix asphalt for any area + depth combination
- Step-by-step formula breakdown (so you can show the math)
- Quick lookup tables for sq ft →tons and yd² →tons
- Truckloads at 22-ton trucks (plant ordering reality)
Run the asphalt tonnage calculator
Enter your area dimensions and depth. The calculator below uses 145 lb/ft³ HMA density and outputs both US short tons and metric tonnes. If you need pricing tied to the tonnage, use the asphalt cost calculator — same engine, with regional plant pricing layered on top.
The asphalt tonnage formula, step by step
Tons of asphalt = (Length × Width × Thickness in feet) × 145 lb/ft³ ÷ 2,000. That's the whole thing. Every state DOT, every paving estimator I've worked with, every plant ticket I've ever signed uses the same equation. There is no proprietary formula, no insider trick — just unit-consistent multiplication.
Step 2. Volume (ft³) = Area × (Thickness_inches ÷ 12)
Step 3. Weight (lb) = Volume × Density (lb/ft³)
Step 4. Tons = Weight ÷ 2,000
Step 5. Order tons = Tons × (1 + waste%)
Worked example for a 30 ft × 50 ft parking pad at 3 inches:
Volume = 1,500 × (3 ÷ 12) = 375 ft³
Weight = 375 × 145 = 54,375 lb
Tons = 54,375 ÷ 2,000 = 27.2 US tons (base)
Order = 27.2 × 1.07 = 29.1 tons (with 7% waste)
Square feet to tons of asphalt — quick reference
Eyeballing a job? These are tons for common areas and depths. 145 lb/ft³ density, 0% waste. Add 7% to any number for typical ordering.
| Area (ft²) | 1.5–/th> | 2–/th> | 2.5–/th> | 3–/th> | 4–/th> |
|---|---|---|---|---|---|
| 100 ft² | 0.91 | 1.21 | 1.51 | 1.81 | 2.42 |
| 200 ft² | 1.81 | 2.42 | 3.02 | 3.63 | 4.83 |
| 500 ft² | 4.53 | 6.04 | 7.55 | 9.06 | 12.08 |
| 800 ft² | 7.25 | 9.67 | 12.08 | 14.50 | 19.33 |
| 1,000 ft² | 9.06 | 12.08 | 15.10 | 18.13 | 24.17 |
| 1,500 ft² | 13.59 | 18.13 | 22.66 | 27.19 | 36.25 |
| 2,000 ft² | 18.13 | 24.17 | 30.21 | 36.25 | 48.33 |
| 5,000 ft² | 45.31 | 60.42 | 75.52 | 90.63 | 120.83 |
| 10,000 ft² | 90.63 | 120.83 | 151.04 | 181.25 | 241.67 |
Square yards to tons of asphalt — paving contractor reference
Contractors and plants work in square yards. Standard yard conversion: 1 yd² = 9 ft². Tons per square yard at 2" depth and 145 lb/ft³ = 0.109 tons/yd².
| Depth | Tons per yd² | yd² per US ton | m² per tonne |
|---|---|---|---|
| 1.5" | 0.082 | 12.3 | 11.3 |
| 2" | 0.109 | 9.2 | 8.5 |
| 2.5" | 0.136 | 7.4 | 6.8 |
| 3" | 0.163 | 6.1 | 5.6 |
| 4" | 0.218 | 4.6 | 4.2 |
| 50 mm (~2 in) | 0.111 | 9.0 | 8.3 |
| 75 mm (~3 in) | 0.166 | 6.0 | 5.5 |
The "yd² per ton" column is the question most homeowners actually ask: how much coverage does one ton give me? At 2-inch residential thickness, the answer is 9.2 square yards per ton — or 83 square feet per ton. For the same numbers applied to a residential project, see the driveway asphalt calculator.
Cubic yards to tons of asphalt
1 cubic yard of hot mix asphalt = 1.96 US short tons at 145 lb/ft³ density. The math: 1 yd³ × 27 ft³ × 145 lb ÷ 2,000 = 1.9575 tons. Most ticket calculations round to 2 tons per cubic yard for quick math.
| Volume | US tons (HMA) | Metric tonnes | Cubic meters |
|---|---|---|---|
| 1 yd³ | 1.96 | 1.78 | 0.76 |
| 5 yd³ | 9.79 | 8.88 | 3.82 |
| 10 yd³ | 19.58 | 17.76 | 7.65 |
| 25 yd³ | 48.94 | 44.40 | 19.11 |
| 50 yd³ | 97.88 | 88.80 | 38.23 |
| 1 m³ asphalt | 2.56 | 2.32 | 1.00 |
Why "base tonnage" and "ordered tonnage" are not the same number
The tonnage formula gives you base tons — what's mathematically in the cured pavement. What you order from the plant is base tons plus waste plus compaction loss. On a typical 2" residential pour, I default to about 7% more. On a 4" commercial lot over rutted base it's closer to 10% in my experience — I've learned the hard way that a soft, wet sub-base will swallow more first-lift material than the spec sheets admit.
Where the extra material goes:
- Compaction shrink (5-8%): loose laydown is fluffy; the roller squashes it down.
- Edge waste (1-2%): material spills off the screed edges, gets raked back, but not all returns.
- Transitions (1-2%): meeting existing pavement at the apron and around drains.
- Sub-base absorption (1-2%): a soft or wet base swallows some of the first lift.
- Cold edges (1-2%): on long pours, the trailing edge cools and gets re-worked or scrapped.
The calculator above splits "tons before waste" and "tons to order" so you can see both numbers. The methodology page walks through how I derived the 7% default from field data.
Tonnage and truckloads — how plants actually deliver
Standard belly-dump or live-bottom trailers haul 20–25 US tons per load. Most plants quote in 22-ton increments. For projects above 50 tons, you may get billed for a full truckload even if you only need a partial — ask up front.
| Ordered tons | Truckloads | Per-truck fill |
|---|---|---|
| 5 tons | 1 | partial (small dump) |
| 10 tons | 1 | ~half-full |
| 22 tons | 1 | full |
| 30 tons | 2 | full + ~8 t partial |
| 50 tons | 3 | 2 full + 6 t partial |
| 100 tons | 5 | 4 full + 12 t partial |
On the cost calculator, you'll see partial-load surcharges break out separately — they can add 15–25% to a small driveway material bill.
Asphalt tonnage calculator FAQ
What's the formula for figuring asphalt tonnage?
Tons = (length × width × thickness in feet) × 145 ÷ 2,000. For 2-inch depth, the shortcut is tons = square feet × 0.0121. Add 5–10% for compaction loss and waste before ordering.
How many tons of asphalt are in a square yard?
At 2-inch thickness: 0.109 tons/yd² (218 lb/yd²). At 3-inch: 0.163 tons/yd² (326 lb/yd²). One ton of hot mix covers about 9.2 yd² at 2 inches.
How many tons in a cubic yard of asphalt?
1.96 US short tons per cubic yard at 145 lb/ft³ density. Plant tickets often round to 2 tons/yd³.
How do I convert square feet to tons of asphalt?
Multiply square feet by depth in inches, then by 0.00604 (this is 145 ÷ 12 ÷ 2,000). Example: 800 ft² × 2 in × 0.00604 = 9.67 tons before waste.
What's the density of asphalt for tonnage calculations?
145 lb/ft³ (2,322 kg/m³) for standard hot mix. Variants: 142 (WMA), 148 (SMA), 135 (cold mix), 120 (recycled millings). The calculator above lets you swap mix types.
How accurate is this asphalt tonnage calculator?
Within 3-5% of plant delivery weight on jobs where the field density lands at the default 145 lb/ft³. The two biggest sources of variance: actual plant density (142–148 range), and whether the contractor compacts to spec.