Tons of Asphalt for 21,000 Square Feet
Tons of asphalt for 21,000 square feet: about 253.8 tons at 2 inches compacted and about 380.6 tons at 3 inches, figured at roughly 145 pounds per cubic foot. That is 2,333 square yards of pavement.
Asphalt tonnage calculator →Tons by thickness
| Thickness | Tons | Tons +5% |
|---|---|---|
| 1.5 in | 190.3 | 199.8 |
| 2 in | 253.8 | 266.4 |
| 2.5 in | 317.2 | 333.0 |
| 3 in | 380.6 | 399.7 |
| 4 in | 507.5 | 532.9 |
How the numbers are built
- 21,000 sq ft × (2 ÷ 12) ft = 3,500 cubic feet at 2 inches.
- × 145 lb = 507,500 lb.
- ÷ 2,000 = 253.8 tons.
Rule of thumb: roughly 6 tons per 1,000 square feet for every inch of thickness. See tons of asphalt per 1,000 square feet.
How big 21,000 square feet is
This is commercial scale: a parking lot, a long private road or a large apron. Commercial lots usually call for thicker sections and a binder course under the surface.
Trucks and ordering
At 3 inches, 380.6 tons is about 29 truckloads at around 14 tons each. Plants set minimum orders and charge for hauling; see asphalt hauling cost per ton.
Things that move the total
- Mix density typically runs 140 to 150 lb per cubic foot.
- Base condition: dips and ruts fill with extra mix.
- Waste of 5 to 10 percent is a common allowance.
Run exact numbers with the asphalt tonnage calculator.
When to choose asphalt
Best suited to:
- Driveways, parking pads and private lanes that need a smooth, sealed surface
- Overlays on old pavement that is cracked but still structurally sound
- Areas where snow will be plowed, since a paved surface does not throw stone
Think twice for:
- Ground that stays soft or wet, unless the base and drainage are fixed first
- Very small patches, where bagged cold patch is often simpler
- Jobs in cold weather, since hot mix needs warm temperatures to compact properly
Quick reference numbers
- Per inch over 100 sq ft: about 0.62 tons of asphalt (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 6.2 tons.
- Another size for comparison: a 15x30 area at 3 inches takes about 8.3 tons.
- Weight used here: about 2.0 tons per cubic yard (roughly 145 lb per compacted cubic foot).
Common estimating mistakes
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
Questions people ask
How many tons of asphalt for 21,000 square feet at 2 inches?
About 253.8 tons.
How many tons for 21,000 square feet at 3 inches?
About 380.6 tons.
How many square yards is 21,000 square feet?
About 2,333 square yards.
What density is used here?
145 lb per compacted cubic foot, a common planning figure.
Should I add extra?
Most estimators add 5 to 10 percent for waste and uneven base.
Related guides
- How Many Tons of Asphalt per 1,000 Square Feet?
- How to Convert Square Feet to Asphalt Tons
- How Many Square Feet Does a Ton of Asphalt Cover?
- Tons of Asphalt for 19,000 Square Feet
- Tons of Asphalt for 20,000 Square Feet
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