Asphalt Unit Converter
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Convert between the units that come up when estimating and ordering asphalt: square feet, square yards, acres, cubic feet, cubic yards, and tons. All conversions use standard 145 lb/ft³ hot-mix density and can be adjusted for specialty mixes.
Area converter
Cubic yards → tons
Default density is standard hot mix (145 lb/ft³). Adjust if your supplier quotes a different mix.
Quick conversion reference
Fixed conversion factors for standard 145 lb/ft³ dense-graded hot mix. Any figure that includes "tons" changes proportionally if you're using a different mix density.
| Convert from | Convert to | Factor | Notes |
|---|---|---|---|
| 1 square yard | 9 square feet | × 9 | Area only |
| 1 acre | 43,560 sq ft | × 43,560 | Area only |
| 1 cubic yard | 27 cubic feet | × 27 | Volume only |
| 1 cubic yard (HMA) | ≈ 2.02 tons | × 2.02 | At 145 lb/ft³ |
| 1 cubic foot (HMA) | ≈ 0.0725 tons | × 0.0725 | At 145 lb/ft³ |
| 1 ton (HMA) | ≈ 13.8 cubic feet | × 13.8 | At 145 lb/ft³ |
| 1 ton (HMA) | ≈ 0.51 cubic yards | × 0.51 | At 145 lb/ft³ |
| 1 ton covers @ 2 in | ≈ 82 sq ft | ÷ depth factor | At 145 lb/ft³ |
| 1 ton covers @ 3 in | ≈ 55 sq ft | ÷ depth factor | At 145 lb/ft³ |
| 1 ton covers @ 4 in | ≈ 41 sq ft | ÷ depth factor | At 145 lb/ft³ |
Why asphalt uses so many different units
The unit confusion in asphalt estimating comes from the fact that different parts of the process use different measurement conventions. Architects and surveyors work in square feet or square yards. Landscaping and earthwork specs often use acres. Concrete contractors think in cubic yards. Asphalt suppliers sell by the ton. And structural specs specify thickness in inches. Getting from a site drawing to a material order requires converting through several of these at once.
The two most common conversion errors in practice: forgetting that one cubic yard contains 27 cubic feet (not 3), and using volume in cubic yards directly in the density formula without converting to cubic feet first. Both produce estimates that are wildly off — by a factor of 3 and 27 respectively — which is why the main asphalt calculator handles all the intermediate conversion steps automatically.
For large commercial projects specified in acres, the acre-to-tons figure is worth understanding: one acre of asphalt at 3 inches thick using standard hot mix weighs approximately 789 tons. At $150/ton material cost, that's about $118,000 in asphalt material alone for a single acre of parking lot — before base prep, labor, or equipment.
The formulas behind the conversions
Need to run a full project estimate rather than a one-off conversion? The asphalt calculator applies all these formulas together and shows tons, cubic yards, and cost in one result.
Frequently asked questions
One cubic yard of standard compacted hot-mix asphalt (145 lb/ft³) weighs approximately 2.02 tons. For porous mix at 125 lb/ft³, that drops to about 1.74 tons per cubic yard. For SMA at 150 lb/ft³, it's about 2.08 tons per cubic yard.