# How many tons of asphalt do I need?

Computes the tons of hot-mix asphalt for a driveway, parking lot or road from its area, compacted thickness and compacted density, with a waste allowance and a cost.

- Page: https://www.acalculator.org/construction/asphalt-calculator
- JSON spec: https://www.acalculator.org/construction/asphalt-calculator.json
- Version: 18419a603fb0

## Default answer

Example with the default inputs (Area Length × width, Length 100 ft, Width 20 ft, Compacted thickness 3 in, Waste allowance 0%, Air voids 4%): 2,000 ft² of asphalt 3 in thick needs 36.83 tons.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| geometryMethod | Area | Whether you know the length and width or the total area. |
| len | Length | The length of the area to pave. |
| wid | Width | The width of the area to pave. |
| area | Total area | The area to pave. |
| thick | Compacted thickness | The finished thickness of the asphalt after rolling. |
| wasteFactor | Waste allowance | Extra asphalt for waste and uneven base, as a percent of the weight. |
| density | Compacted density | The density of the compacted asphalt. Leave empty to use Gmm and air voids, or the typical 2,360 kg/m³ (147.3 lb/ft³). |
| gmm | Maximum specific gravity (Gmm) | The theoretical maximum specific gravity of the mix, from the mix design. Used with the air voids when no density is typed. |
| airVoids | Air voids | The air voids in the compacted mat, as a percent of its volume. Used with Gmm. |
| price | Price per ton | The price of one US ton (2,000 lb) of asphalt. Leave empty to skip the cost. |
| delivery | Delivery cost | A flat trucking or delivery charge added to the material cost. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| tons | Asphalt to order | The weight in US short tons: area × compacted thickness × density × (1 + waste ÷ 100). |
| tonnes | Metric tonnes | The same weight in metric tonnes (1,000 kg). |
| area | Area | The area paved. |
| volume | Compacted volume | Area × compacted thickness, before the waste allowance. |
| densityUsed | Density used | The compacted density used: the one typed, else Gmm × (1 − air voids) × 1,000 kg/m³, else 2,360 kg/m³. |
| cost | Estimated cost | Tons × price per ton, plus the delivery cost. |

## Method

tons = area × compacted thickness × compacted density × (1 + waste ÷ 100) ÷ 2,000 lb

## Assumptions

- The thickness is the compacted (finished) thickness, and the density is the compacted density, so no loose-to-compacted factor is applied.
- With no density typed, the compacted density is Gmm × (1 − air voids ÷ 100) × 1,000 kg/m³ when Gmm is given, else a typical 2,360 kg/m³ (147.3 lb/ft³).
- Tons are US short tons of 2,000 lb; tonnes are metric tonnes of 1,000 kg.
- The cost is tons × price per ton, plus a flat delivery cost.

## Worked examples

1. geometryMethod = simple, len = 30.48, wid = 6.096, thick = 0.0762, wasteFactor = 0%, airVoids = 4% gives tons = 33,413.878979, volume = 14.158423. Source: NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement: 1 cubic yard = 27 cubic feet, 1 short ton = 2,000 pounds. https://www.nist.gov/document/2026-nist-handbook-44-appendix-c.
2. geometryMethod = simple, len = 30.48, wid = 6.096, thick = 0.0762, wasteFactor = 5%, gmm = 2.45, airVoids = 4%, price = $110.00 gives densityUsed = 2,352, tons = 34,965.642172, cost = $4,239.73. Source: Asphalt Institute, MS-2 Asphalt Mix Design Methods, 7th edition: air voids and bulk specific gravity of compacted mix. https://bookstore.asphaltinstitute.org/catalog/book/ms-2-asphalt-mix-design-methods; NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement: 1 cubic yard = 27 cubic feet, 1 short ton = 2,000 pounds. https://www.nist.gov/document/2026-nist-handbook-44-appendix-c.
3. geometryMethod = direct, area = 464.5152, thick = 0.0508, wasteFactor = 0%, airVoids = 4%, density = 2,322.677189, price = $100.00, delivery = $250.00 gives tons = 54,809.078042, cost = $6,291.67. Source: NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement: 1 cubic yard = 27 cubic feet, 1 short ton = 2,000 pounds. https://www.nist.gov/document/2026-nist-handbook-44-appendix-c.

## FAQ

### What is an asphalt calculator and how does it work?

An asphalt calculator estimates the amount of asphalt needed for a paving project, from a residential driveway to a parking lot or road. It works in two steps. Step 1, volume: area × compacted thickness. Step 2, weight: volume × compacted density. It can also add a waste allowance and a cost per ton.

### How do I calculate asphalt tonnage for my project?

You need three numbers: the area (length × width), the finished compacted thickness, and the compacted density of the mix. Tons = area × compacted thickness × density ÷ 2,000 lb per ton. For example, 2,000 sq ft at 3 inches (0.25 ft) and 145 lb/ft³ is 2,000 × 0.25 × 145 ÷ 2,000 = 36.25 tons. Use the compacted thickness with the compacted density; do not also multiply by a loose-to-compacted factor, or the answer comes out about 25% too high.

### What are the different types of asphalt mixes and their densities?

Dense-graded hot mix is the usual paving mix, and compacted it typically weighs about 145 to 150 lb/ft³ (2,300 to 2,400 kg/m³). Stone matrix asphalt is a similar weight, porous asphalt is lighter because it has more air voids, and warm mix is about the same as hot mix. The exact density of a mix is Gmm × (1 − air voids), so ask your supplier for the Gmm of their mix for the best estimate.

### What is the difference between compacted and loose thickness?

Compacted thickness is the final pavement thickness after rolling, while loose thickness is the thickness of the material as it is placed before rolling. Asphalt is laid thicker than the finished mat because rolling compresses it. When you estimate tons, use the compacted thickness with the compacted density: the weight of asphalt does not change when it is rolled, only its thickness does.

### How do I account for waste and overage in asphalt calculations?

Many paving estimates add 5-10% for material lost during placement, trimming, and uneven base. The calculator adds the waste allowance you enter to the weight.

### What are the standard asphalt thickness recommendations?

Thickness depends on traffic and the base below. Residential driveways are often 2-3 inches, light commercial parking 3-4 inches, and heavier traffic more. Always consult local engineering standards for your project.

### How do I convert between different units in asphalt calculations?

The calculator handles unit conversions automatically. Key conversions: 1 ton = 2,000 lb, 1 cubic yard = 27 cubic feet, 1 square yard = 9 square feet, and 1 lb/ft³ = 16.018 kg/m³. You can enter feet, yards, or meters, and inches, millimeters, or centimeters for the thickness.

### What factors affect asphalt density and how do they impact calculations?

Asphalt density depends on the aggregate, the binder content, and the air voids left after compaction. A denser mix weighs more for the same volume, so it takes more tons to pave the same area. Tons scale directly with density: a 5% denser mix needs 5% more tons.

### How accurate are asphalt calculator estimates?

The volume is exact for the dimensions you enter. The weight is as good as the density you use, and the finished thickness on site is never perfectly even. For critical projects, verify with your asphalt supplier and plan for some extra material.

### What does an asphalt driveway cost?

Multiply the tons by the price per ton your supplier quotes, and add delivery. Prices vary by region, mix, and season, so use a local quote rather than a national average.

## Sources

- NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement: 1 cubic yard = 27 cubic feet; 1 short ton = 2,000 pounds. https://www.nist.gov/document/2026-nist-handbook-44-appendix-c
- Asphalt Institute, MS-2 Asphalt Mix Design Methods, 7th edition: air voids and bulk specific gravity of compacted mix. https://bookstore.asphaltinstitute.org/catalog/book/ms-2-asphalt-mix-design-methods