Australian Bitumen Calculator
Estimate asphalt tonnage, bitumen quantity, and AUD cost for Austroads projects using DG14, SMA, and OGFC presets.
Austroads AP-T295/14 and state road authority specifications (VicRoads, TMR, DPTI, RMS).
Australia spans hot arid to temperate zones — bitumen grade selection varies significantly by state and elevation.
Asphalt costs in Australia range from A$120–$280/tonne depending on region and specification.
Estimating Asphalt and Bitumen for Australian Projects
Australian paving practice follows Austroads and state road-authority specifications rather than US standards, and the terminology differs — mixes are described as dense-graded asphalt (for example DG14 and DG20) and binders by class, such as Class 320, along with multigrade and polymer-modified grades for heavy-duty work. The continent's climate range, from tropical Queensland to alpine Victoria, drives binder selection, and quantities are worked in metric units and priced per tonne in Australian dollars.
This calculator uses metric inputs and Austroads-style parameters throughout. Enter length, width and compacted thickness in metres and millimetres, select your dense-graded mix, and it returns total tonnage, the bitumen and aggregate breakdown, and a cost estimate in AUD. Typical dense-graded asphalt compacts to roughly 2,300–2,400 kg/m³, though this varies with aggregate source and nominal mix size. Sprayed-seal work is estimated by spray rate rather than by volume, so use the appropriate method for your job, and always confirm binder content and density against the project mix design and the relevant state specification.
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Australian Mix Design Standards
Typical bitumen content and density values for common Australian pavement mixes.
| Mix Type | Bitumen Content (%) | Density (kg/m³) | Typical Application | Standard |
|---|---|---|---|---|
| DG14 Dense-Graded | 5.0–6.0 | 2300–2400 | Wearing/intermediate course | Austroads / AS 2150 |
| DG10 Dense-Graded | 5.5–6.5 | 2300–2390 | Thin wearing course (<35 mm) | Austroads |
| SMA (Stone Mastic) | 6.0–7.0 | 2250–2350 | High-traffic arterials | Austroads AP-T295 |
| OGFC (Open-Graded) | 5.5–6.5 | 1950–2100 | Noise-reducing surfaces | State RTA specs |
| RAP Overlay | 4.5–5.5 | 2200–2300 | Recycled overlay | Austroads |
| Sprayed Seal / Chip | N/A | — | Low-volume roads | Austroads AP-T189 |
Australian Bitumen Tonnage Formula
The calculation follows Austroads methodology: convert project dimensions to volume, apply the compacted mix density, then split into bitumen and aggregate components.
Road Dimensions Example
A 1 km two-lane road (3.5 m lanes, 7 m total width) with a 50 mm DG14 wearing course: 1,000 m × 7 m × 0.05 m = 350 m³. At 2,350 kg/m³ density: 822.5 tonnes of asphalt mix required.
Material Split
At 5.5% bitumen (Austroads DG14 default): 822.5 t × 0.055 = 45.2 t of bitumen binder. Remainder: 822.5 − 45.2 = 777.3 t of crushed aggregate. Add 7% for waste → order 880 t of total mix.
AUD Cost Estimate
At A$200/t material cost: 880 t × $200 = A$176,000 for mix material only. Full project cost (plant, traffic management, mobilisation, linemarking) typically adds 60–100% on top. Use the Cost Calculator to enter your regional quote.
This calculator uses Austroads-aligned defaults: DG14 at 2,350 kg/m³, SMA at 2,300 kg/m³, and OGFC at 2,050 kg/m³. Regional aggregate sources (e.g. granite in Victoria, basalt in QLD/NSW) cause density to vary ±50 kg/m³. For National Land Transport Network (NLTN) projects, always use the density from the project's approved Job Mix Formula (JMF). Use the Tonnage Calculator to model any custom density.
Who Uses the Australian Calculator
This tool is built around Australian pavement standards and AUD pricing, making it suitable across all project types and states.
State & Federal Road Authorities
Engineers at VicRoads, TMR Queensland, NSW Transport, Main Roads WA, and DPTI SA use tonnage calculators at concept and detailed design stage to prepare cost estimates for capital works programmes. DG14 is the dominant wearing course mix on Australian state highway networks, with SMA specified on high-speed, high-traffic motorways. Cross-reference your calculations with the Material Calculator to separate bitumen and aggregate procurement.
Residential Subdivision Roads
Civil engineers and developers use bitumen calculators to prepare pavement schedules for greenfield subdivisions. A typical Australian residential street uses 40 mm of DG14 over a 100 mm DG20 base course, with lane widths of 5.5–7.5 m (AS 1428 access guidelines). A 200 m residential cul-de-sac at 7 m wide and 50 mm DG14 requires approximately 165 tonnes of wearing course mix. Use the Road Calculator for multi-layer estimates.
Local Government & Council Works
Australian local councils are major pavement asset owners, responsible for resurfacing thousands of km of local roads each year. Quantity surveyors in council infrastructure teams use this calculator to budget annual resealing and resurfacing programmes. Typical urban council road reseal: 40 mm DG14 over 1,000 m × 8 m = 752 tonnes at ~A$180/t = A$135,000 material budget. See Repair Calculator for pothole patching budgets.
More Regional Calculators
Select a region below for location-specific mix defaults and currency.
How to Use This Calculator
Enter Project Dimensions
Input the length, width, and compacted thickness of your pavement area. For a standard Australian road lane, width is typically 3.5 m and DG14 wearing course thickness is 40–50 mm as per Austroads guidelines.
Select Your Australian Mix
Choose the appropriate mix type — DG14 Dense-Graded for most wearing courses, SMA for high-traffic arterials, or OGFC for noise-reducing surfaces. Adjust the bitumen content percentage to match your state road authority specification (VicRoads, TMR, RMS, DPTI).
Add AUD Cost & Calculate
Optionally enter the price per tonne in AUD (typically A$120–$280/tonne depending on region and mix grade). Click Calculate to get total mix weight in tonnes, bitumen and aggregate quantities, and total project cost estimate.
Frequently Asked Questions
Per Austroads AP-T295/14, DG14 Dense-Graded Asphalt typically requires 5.0–6.0% bitumen by weight of total mix. The exact content is determined by mix design testing to achieve target air voids and Marshall stability. Most state road authorities such as VicRoads and TMR specify 5.5% as a starting point for design.
Australian asphalt prices range from approximately A$120–$280 per tonne depending on the state, mix type, and project size. Metropolitan areas such as Sydney and Melbourne tend to be on the higher end (A$180–$280/t), while regional areas may be lower. SMA and polymer-modified mixes command a premium over standard DG14.
Standard DG14 dense-graded asphalt has a compacted density of approximately 2300–2400 kg/m³, with 2350 kg/m³ used as a common default. OGFC (open-graded friction course) mixes are lighter at 1950–2100 kg/m³ due to their higher air void content. Always confirm with your specific mix design data or contractor's laboratory results.
The primary reference is Austroads AP-T295/14 for mix design of dense-graded and stone mastic asphalt, complemented by AS 2150 (Hot Mix Asphalt) and individual state specifications. For sprayed seals, Austroads AP-T189 applies. Each state road authority (VicRoads, TMR Queensland, NSW RMS, SA DPTI, WA Main Roads) publishes supplementary specifications that take precedence in their jurisdiction.
DG14 and DG10 are both Austroads Dense-Graded mixes, with the number indicating the nominal maximum aggregate size in mm. DG14 (14 mm) is the most widely used wearing course mix in Australia — suitable for most urban and rural roads at 40–60 mm compacted thickness. DG10 (10 mm) has a finer aggregate gradation and is used for thin overlays (25–35 mm), urban low-speed roads, and surfaces requiring a finer texture. DG10 typically has a slightly higher bitumen content (5.5–6.5%) and similar density to DG14. For bicycle paths and footways, DG10 or DG7 may be specified.
For resurfacing (overlay without milling), a standard minimum overlay thickness of 40 mm DG14 is specified on most Austroads-aligned projects to ensure adequate compaction and performance life. Thinner overlays (25–35 mm DG10) are used on low-traffic urban roads or where headroom constraints limit layer thickness. For rehabilitation projects with structural deficiency, a 50–75 mm binder course (DG20) plus 40–50 mm wearing course is common. Always check the current Austroads AGPT (Pavement Technology Guide) pavement design procedure for traffic loading and layer thickness requirements.
Asphalt material prices in Australia vary significantly by state and remoteness. Approximate ranges for supply-only DG14 (2026): NSW/VIC (metro): A$180–$260/t; QLD (SE): A$170–$250/t; WA (metro Perth): A$200–$300/t; SA: A$180–$260/t; Remote/NT: A$300–$500+/t due to haulage costs. Prices fluctuate with bitumen crude oil pricing and are typically higher in summer peak season. Always get current quotes from local asphalt plants — Boral, Fulton Hogan, Downer, and Pronto Asphalt are major suppliers nationally. Use the Cost Calculator to estimate your project cost with current prices.