How to Use This Calculator
Use this Asphalt Tonnage Calculator to estimate how many tons of asphalt you need for a driveway, parking lot, or paving project. Enter your project length and width in feet and depth in inches. Select Hot Mix Asphalt (HMA) for a new driveway or parking lot, or Asphalt Millings for a recycled material base layer. The result shows tons with a 10% waste allowance already included in the total. Enter your supplier's price per ton to get a material cost estimate. For L-shaped or irregular driveways, calculate each rectangular section separately, then add the tonnage totals. Your paving contractor will confirm the final order quantity based on their specific mix design and the site conditions.
How to Calculate Asphalt Tonnage
Formula: Tons = (Length × Width × Depth in inches ÷ 12) × Density ÷ 2,000.
Hot mix asphalt density: 145 lbs per compacted cubic foot. Asphalt millings: 110 lbs per cubic foot.
Example: a 40-foot by 20-foot two-car driveway at 3 inches of hot mix asphalt. Step 1: cubic feet = 40 × 20 × (3 ÷ 12) = 200 ft³. Step 2: raw weight = 200 × 145 = 29,000 lbs. Step 3: raw tons = 29,000 ÷ 2,000 = 14.5 tons. Step 4: add 10% waste = 15.95 tons. Order 16 tons.
Quick coverage reference: 1 ton of HMA covers about 55 sq ft at 3 inches and 40 sq ft at 4 inches. These are planning estimates only; the calculation above is more accurate for ordering.
Ordering Asphalt Tips
Match depth to the expected traffic. Passenger cars only: 2 to 3 inches of HMA over a 4-inch compacted aggregate base. Regular pickup trucks and SUVs: 3 to 4 inches. Commercial deliveries and garbage trucks: 4 to 6 inches. Under-built asphalt ruts and cracks quickly under loads it was not designed for.
Call the batch plant, not just the contractor. Asphalt is time-sensitive: it must be placed within 30 to 45 minutes of leaving the plant. Batch plants have scheduling windows, and a large project may need multiple loads coordinated. If you are managing your own project, confirm the plant's operating hours and delivery radius before scheduling.
Price lock in summer. Asphalt prices track crude oil prices and peak in fall when paving season winds down. Getting a quote in May or June for work done in July often produces the best price and contractor availability. Waiting until September typically means higher prices and a tighter contractor schedule.
What to Buy
For new driveways and parking lots: contact local paving contractors for hot mix asphalt delivered and installed. Hot mix cannot be purchased as a DIY material at hardware stores. Most contractors quote per square foot installed, including base prep and compaction. Get two to three quotes; asphalt pricing varies more than most other construction materials.
For repairs under 20 square feet: cold patch asphalt in 50-pound bags. Available at hardware stores under brands like Quikrete, Sakrete, and QPR. Cold patch is workable without heating and cures under traffic. For large patches, use the tonnage calculator to determine how many bags to buy (one 50-lb bag fills about 0.5 square feet at 3 inches).