Asphalt Calculator
Estimate asphalt tonnage, volume, and cost for a driveway, parking area, or paved surface — with the full formula breakdown shown.
Your Project
Project Sections
Divide the surface into rectangular sections and add them separately for irregular or L-shaped projects.
Section 01 of 01
Finished, compacted depth — not a loose/uncompacted lift thickness.
145 lb/ft³ is an editable estimating default. Actual density varies by mix; use your supplier or project specification when available.
An editable ordering contingency — separate from density, which already converts compacted volume to mass.
Advanced options
Truckloads
Optional. Estimates truckloads by dividing the recommended order weight by your entered truck capacity — not a legal payload, axle, or routing determination.
From your hauler or supplier — not a universal truck payload.
Cost estimate
Entirely optional — no price is pre-filled. Estimated asphalt material cost only; excludes labor, delivery, equipment, excavation, base preparation, tack coat, striping, taxes, and permits.
Your Estimate
Enter your project dimensions to see your asphalt estimate.
How It's Calculated
Methodology
Enter your project dimensions to see the formula breakdown.
Assumptions & Accuracy
The 145 lb/ft³ density and 5% order allowance are editable estimating defaults, not fixed rules. Every quantity shown updates from your own inputs.
This tool estimates material quantity only. It does not design pavement structure and does not determine structural capacity, correct thickness, base/subbase design, drainage, grading, frost protection, soil suitability, traffic loading, compaction procedure, paving temperatures, or code/specification compliance. For load-bearing or high-traffic work, follow your project specifications and qualified professional/supplier guidance.
Project Guide
How to measure an asphalt project
Measure the length and width of each rectangular area and multiply them for its area. For an irregular or L-shaped surface, divide it into rectangular sections and add them separately — the calculator sums their areas automatically.
How asphalt tonnage is calculated
Area × compacted thickness gives volume. Volume × density gives weight. Weight converted to tons (or tonnes) is what you order. Each step is shown in the How It's Calculated section using your own entered values.
Why asphalt density matters
Density is mass per volume, and it isn't the same for every mix. 145 lb/ft³ is a commonly used estimating value, not a universal constant — mix design, aggregate, binder content, air voids, and target compaction all affect actual density. Use your supplier's or project specification's density when it's available.
Compacted thickness vs. loose thickness
This calculator expects the final, compacted asphalt thickness — not a loose placement thickness. Don't enter a loose lift thickness unless that figure is already your intended final value; actual placement and compaction procedures are project-specific and outside what this calculator estimates.
How much extra asphalt should I order?
The order allowance is a separate estimating contingency for ordering extra material — it is not a substitute for density, which already converts your compacted volume into mass. No single allowance percentage fits every project.
How asphalt is sold
Asphalt is commonly estimated and ordered by weight. This calculator reports US short tons (2,000 lb) in Imperial mode and metric tonnes (1,000 kg) in Metric mode — these are different units, and the calculator never mixes them internally.
Estimating truckloads
The optional truckload estimate divides your recommended order weight by a truck capacity you enter. It's a material-hauling estimate only — actual legal payload depends on the specific truck, regulations, and your supplier or hauler.
Estimating asphalt material cost
Cost is your entered price per ton (or tonne) multiplied by the recommended order weight. It covers material only — it excludes labor, delivery, equipment, excavation, base preparation, tack coat, striping, taxes, and permits.
Using the calculator for multiple asphalt courses
If your project uses multiple asphalt courses (for example, a binder course and a surface course), enter their combined compacted thickness for one total material estimate, or calculate each course separately if they use different densities or specifications.
Common estimating mistakes
- Forgetting to convert thickness from inches to feet before multiplying.
- Using area alone without a thickness, or vice versa.
- Assuming cubic yards of volume directly equal tons of weight.
- Using a density that doesn't match the actual mix.
- Confusing loose thickness with compacted thickness.
- Treating 145 lb/ft³ as a universal, always-correct value.
- Rounding tonnage before calculating cost or truckloads.
- Confusing US short tons with metric tonnes.
- Forgetting to include an order allowance.
- Treating a generic truck capacity as a legal payload limit.
Worked Example
Illustrative values only — enter your own project's dimensions above for a real estimate.
Example
20 ft × 50 ft driveway, 3 in compacted asphalt, 145 lb/ft³ density (estimating default), 5% order allowance, plus an illustrative 10-ton truck and $120/ton price.
Inputs
- Section: 20 ft × 50 ft
- Compacted thickness: 3 in
- Density: 145 lb/ft³ (estimating default)
- Order allowance: 5%
- Truck capacity: 10 tons (illustrative)
- Price: $120/ton (illustrative)
Calculation
- Area: 20 × 50 = 1,000 ft²
- Thickness: 3 ÷ 12 = 0.25 ft
- Volume: 1,000 × 0.25 = 250 ft³ (≈ 9.26 yd³)
- Weight: 250 × 145 = 36,250 lb
- Calculated tonnage: 36,250 ÷ 2,000 = 18.125 tons
- Order allowance: 18.125 × 5% = 0.90625 tons
- Recommended order: 18.125 + 0.90625 = 19.03125 tons ≈ 19.03 tons
- Truckloads: 19.03125 ÷ 10 = 1.903125 → 2 truckloads
- Material cost: 19.03125 × $120 = $2,283.75
Result
Practical interpretation