Asphalt Calculator
Enter area and compacted depth to get asphalt tons at 145 lb/ft³, the loose order quantity that accounts for compaction, and the square-yard figure paving quotes use.
Last updated: 2026-09-22
How the calculation works
- Compacted tonnage uses the standard dense-graded hot mix density of 145 lb/ft³ — the figure plants batch to and the figure DOTs specify.
- The order quantity adds 25%: asphalt is delivered and placed loose, compacting to roughly 80% of its loose volume.
- Area in square yards (L×W/9) because paving contractors quote by the square yard, not the square foot.
- Cost multiplies the loose tonnage by your per-ton material price — the honest baseline before labor.
Formula
V = L × W × (depth/12) tons = V × 145 lb/ft³ / 2000 loose tons = compacted tons × 1.25 area_yd² = L × W / 9
| Symbol | Meaning | Unit |
|---|---|---|
ρ | Dense-graded hot mix density (compacted) | lb/ft³ |
1.25 | Loose-to-compacted conversion (delivery grows by 25%) | — |
yd² | Square yards — how paving is quoted | yd² |
Worked example
Interpreting the result
Order the loose figure — plants load loose tons and the paver compacts them down. The 25% compaction factor means a 3 in finished mat needs ~3.75 in loose; a crew that places 3 in loose delivers 2.4 in finished, the classic thin-driveway complaint. Depth matters more than anything: 2 in over unprepared base fails in a few winters, while 3–4 in over compacted aggregate with geotextile on soft ground lasts decades. The material price is a third to a quarter of the installed price — quotes that look expensive per ton usually embed the base work.
Assumptions
- Dense-graded hot mix asphalt at 145 lb/ft³ compacted.
- Compaction to 80% of loose volume — standard for properly rolled mats.
- Rectangular area over prepared base.
Limitations
- Open-graded and lighter mixes run 130–140 lb/ft³ — order tonnage shifts accordingly.
- Base preparation, milling, tack coat and grade work are separate line items.
- Cold-patch and recycled asphalt (RAP) have different densities and pricing.
The base is the driveway
Asphalt gets blamed for failures that start in the base. A 3 in mat over uncompacted native soil pumps and cracks within a few freeze-thaw cycles; the same mat over 6 in of compacted crushed stone with drainage lasts 20–30 years. When comparing paving quotes, the tonnage of asphalt is almost the least of it — the number that predicts lifespan is how much aggregate base, grading and compaction the quote includes. Quotes that undercut the market by a third are usually thinning the base, not the asphalt. The tonnage this calculator produces is your check that the material portion of the quote is honest — the base line item is where the real quality lives.
Frequently asked questions
How many tons of asphalt per square yard?
At 1 inch compacted depth: about 0.08 ton/yd² (145 lb/ft³ × 1/12 ft × 9 ft²/yd² / 2000). So 3 in ≈ 0.25 t/yd². A 60 yd² driveway at 3 in runs ~15 tons.
How thick should an asphalt driveway be?
3–4 in compacted over a compacted aggregate base for cars; 4–6 in for RVs or trucks, often in two lifts. The compacted figure is what counts — delivered loose it's 25% thicker.
Why is my delivered tonnage higher than the compacted calculation?
Plants deliver loose mix that compacts ~20–25% smaller in volume. The same tons are there — they just occupy more space before the roller runs. Ordering by the compacted figure without the conversion is the classic short-order mistake.