Square Feet to Tons of Asphalt 2026: Formula, Table & the 0.00604 Shortcut
The answer first: tons = square feet × depth in inches × 0.00604. That’s the field shortcut I’ve used on hundreds of bid sheets over 15 years. Below: the derivation of why 0.00604, a full lookup table for 100 ft² to 50,000 ft² at every standard depth, and the common mistakes I see homeowners and even early-career estimators make.
What this conversion page gives you:
- The full formula plus the 0.00604 shortcut
- A complete lookup table for 1-6 inch depths and any reasonable area
- Density assumptions and when they’re wrong for your job
- Most common mistakes (in vs ft, base vs ordered tons)
Square feet to tons converter
Enter area and depth - the calculator runs the formula at 145 lb/ft³ default density (compacted HMA). Adjust density for warm mix (142), cold mix (135) or recycled millings (120).
Working at scale? The asphalt tonnage calculator handles multi-section areas, mix density variants and waste allowance. For cubic-yard inputs, switch to the cubic yards to tons converter instead.
The square feet to tons formula
The full derivation, no skipped steps:
= area × depth × (145 ÷ 24,000)
= area × depth × 0.00604
The 24,000 comes from 12 inches per foot times 2,000 lb per US short ton. At 145 lb/ft³ standard HMA density, that ratio is 0.00604167... — rounded to 0.00604 for fieldwork.
Worked example: a 20 ft × 40 ft driveway (800 ft²) at 2 inches deep equals 800 × 2 × 0.00604 = 9.66 tons. Add 7% waste allowance and you order 10.3 tons from the plant. The full derivation with density and waste sources lives in the calculation methodology.
Square feet to tons of asphalt quick reference (1-6 inch depths)
Tons of compacted HMA at 145 lb/ft³. No waste added — bump by 5-10% for residential, 3-5% for commercial highway-grade work.
| Area (ft²) | 1 in | 1.5 in | 2 in | 3 in | 4 in | 6 in |
|---|---|---|---|---|---|---|
| 100 | 0.6 | 0.9 | 1.2 | 1.8 | 2.4 | 3.6 |
| 200 | 1.2 | 1.8 | 2.4 | 3.6 | 4.8 | 7.3 |
| 300 | 1.8 | 2.7 | 3.6 | 5.4 | 7.2 | 10.9 |
| 500 | 3.0 | 4.5 | 6.0 | 9.1 | 12.1 | 18.1 |
| 800 | 4.8 | 7.2 | 9.7 | 14.5 | 19.3 | 29.0 |
| 1,000 | 6.0 | 9.1 | 12.1 | 18.1 | 24.2 | 36.2 |
| 1,500 | 9.1 | 13.6 | 18.1 | 27.2 | 36.2 | 54.4 |
| 2,500 | 15.1 | 22.7 | 30.2 | 45.3 | 60.4 | 90.6 |
| 5,000 | 30.2 | 45.3 | 60.4 | 90.6 | 120.8 | 181.3 |
| 10,000 | 60.4 | 90.6 | 120.8 | 181.3 | 241.7 | 362.5 |
| 25,000 | 151.0 | 226.6 | 302.1 | 453.1 | 604.2 | 906.3 |
| 50,000 | 302.1 | 453.1 | 604.2 | 906.3 | 1,208.3 | 1,812.5 |
When the standard 145 lb/ft³ density is wrong for your job
The 0.00604 shortcut assumes 145 lb/ft³ for compacted hot mix asphalt. That’s the right number for the vast majority of paving projects. Five common situations call for a different density:
| Mix type | Density (lb/ft³) | Shortcut factor | Effect on tonnage |
|---|---|---|---|
| Standard HMA, compacted | 145 | 0.00604 | baseline |
| Warm Mix Asphalt (WMA) | 142 | 0.00592 | -2% |
| Stone Matrix Asphalt (SMA) | 148 | 0.00617 | +2% |
| Cold Mix Asphalt | 135 | 0.00563 | -7% |
| Recycled Asphalt Millings (RAP) | 120 | 0.00500 | -17% |
| Plant-loose (uncompacted) | ~135 | 0.00563 | -7% |
The two that bite estimators most often: millings at 0.00500 (not 0.00604) if you’re paving with recycled material, and loose vs compacted density confusion if you’re working from a plant ticket that lists loose tonnage. The hot mix asphalt calculator walks through each density assumption with the source citations.
Common conversion mistakes (inches vs feet, base vs ordered)
- Putting depth in feet instead of inches. The formula expects depth in inches. A 2-inch depth is 2, not 0.167. If your tonnage comes out 12 times too low, this is why.
- Forgetting to add waste. The 0.00604 formula gives compacted in-place tons. To order, add 5-10% on residential, 3-5% on commercial highway-grade work, and 10-15% on small repair jobs.
- Confusing tons (US short) with tonnes (metric). 1 US ton = 2,000 lb. 1 metric tonne = 1,000 kg = 2,205 lb. If you’re working from UK or Australian specs, the formula is similar but the conversion factor differs. For metric calcs, see the tarmac calculator.
- Using loose density when you should use compacted. Plant tickets report loose tons. The HMA you order from the plant arrives at ~138 lb/ft³ loose; after compaction it’s 145. Your ordered tons are what matter for cost; your placed tons are what matter for spec compliance.
- Mixing up square feet and square yards. 1 yd² = 9 ft². State DOT specs often pay per square yard; estimators often work in square feet. Always confirm units on a job before running the formula.
Square feet to tons FAQ
What is the formula for square feet to tons of asphalt?
Tons = square feet × depth in inches × 0.00604, assuming standard HMA at 145 lb/ft³ density and US short tons. The full derivation: tons = (area / 1) × (depth / 12) × 145 / 2,000. For metric calcs, the equivalent is tonnes = m² × cm depth × 0.02322.
How many tons of asphalt do I need for 1,000 square feet at 3-inch depth?
About 18.1 tons of compacted HMA at standard 145 lb/ft³ density. Add 7% waste to order 19.4 tons from the plant. Material cost at $100-150 per ton runs $1,940-2,910. Installed cost (labor, base prep, equipment) typically adds $3,000-5,500 to that for a small commercial parking pad. See the asphalt cost calculator for the full breakdown.
Is the 0.00604 factor accurate?
Within 1-2% for standard hot mix asphalt at 145 lb/ft³ density. The full unrounded factor is 0.0060417, which is what state DOT spec books use. For high-precision work (large highway projects with millions of dollars on the line), use the full formula with the actual mix design density - 145 can be anywhere from 142 to 148 depending on aggregate type and binder content. For homeowner driveways and small commercial work, 0.00604 is fine.
How do I convert square feet to tons for recycled asphalt millings?
Use 0.00500 instead of 0.00604 - millings density runs about 120 lb/ft³ compared to 145 for fresh HMA. A 1,000 ft² driveway at 3-inch depth needs about 15 tons of millings, vs 18 tons of fresh HMA. The cost gap is even bigger: millings are $30-70 per ton vs $100-150 for HMA. For the millings-specific math see the asphalt millings calculator.
How do I convert square feet of asphalt to square yards?
Divide by 9. 1 square yard equals 9 square feet. State DOT contracts and most aggregate suppliers price per square yard, so you may need to convert between the two. A 1,000 ft² driveway is 111 yd². At 2-inch depth, 1 yd² of asphalt is 0.109 US tons.