Asphalt Calculator
Estimate how many tons of hot-mix asphalt you need for a driveway, parking lot, or overlay — from area and compacted thickness, with a waste allowance and cubic-yard volume.
How to Use
- Enter the length and width of the area to be paved, in feet.
- Set the compacted asphalt thickness in inches — 2" for an overlay, 3"–4" for a residential driveway, more for heavy traffic.
- Leave density at 145 lb/ft³ for typical dense-graded hot mix, or adjust if your supplier quotes a different mix density.
- Add a waste percentage (5%–10%) for edges, joints, and compaction loss.
- Read the tonnage to order, plus the loose volume in cubic yards.
Show Work
Notes
About the Asphalt Calculator
Use the Asphalt Calculator — a free, easy tool for building, materials estimation and site work. Nothing is uploaded, and you do not need an account. Estimate how many tons of hot-mix asphalt you need for a driveway, parking lot, or overlay — from area and compacted thickness, with a waste allowance and cubic-yard volume.
How it works
Put each value in its box and read the answer as you go. Because it recalculates live, you can play with the inputs to see how each one moves the result — handy for checking your own working or planning ahead. Everything happens on your device, so it is fast and private.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
How many tons of asphalt do I need per square foot?
At the standard 145 lb/ft³ density, one inch of asphalt over one square foot weighs about 12 lb, so a square foot at 3 inches is roughly 0.018 tons. This tool does the full math for you from your area and thickness — just plug in the dimensions.
How thick should an asphalt driveway be?
A typical residential driveway uses 2–3 inches of compacted asphalt over a 4–8 inch aggregate base. Driveways that carry heavier vehicles, or that sit on weak soil, go thicker — often 3–4 inches of asphalt. Commercial lots and roads use even more. Set the thickness to the compacted depth, not the loose lift.
What asphalt density should I use?
Dense-graded hot-mix asphalt compacts to roughly 145–150 lb/ft³ (about 2.4 tons per cubic yard). 145 lb/ft³ is a safe default. Open-graded or lightweight mixes weigh less. If your supplier gives a unit weight for the specific mix, use that for the most accurate tonnage.
Why order extra asphalt?
Asphalt is sold by the ton and delivered hot, so you cannot easily top up a short load later. A 5–10% allowance covers compaction, uneven base, spillage, and the wider edges most jobs end up with. Running short means a cold joint and a second mobilization fee.
Does this include the gravel base?
No — this estimates only the asphalt wearing course. The crushed-stone base underneath is a separate material; size it with the Gravel Calculator. A solid, well-compacted base is what makes the asphalt last, so do not skimp on it.
How do I use the Asphalt Calculator?
Just type your numbers. The answer shows up right away — there is no button to press. Change anything and it updates by itself.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Paving a driveway
Turn driveway dimensions and thickness into the tonnage to order so you pave it in one delivery.
Resurfacing / overlay
Estimate a thin 1.5"–2" overlay over existing pavement to refresh a worn surface.
Parking lot estimate
Size a commercial lot pour and budget the asphalt cost before bidding the job.
Patching potholes
Work out how much cold or hot patch a repair area needs without guessing.
Comparing quotes
Check a contractor’s material quantity against the area you measured to spot padding.
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