Total Concrete Volume to Order
—
Including wastage allowance
Instant m³ volume, 20kg bag count & Sydney cost estimates
Whether you're pouring a backyard slab, driveway, strip footing or post holes — our free Sydney concrete calculator gives you accurate cubic metre estimates, bag counts and 2026 Sydney price ranges in seconds.
Sydney's construction costs are among the highest in Australia. Use our free calculator to accurately estimate concrete volumes, bags required and costs before you order — and avoid expensive shortfalls or wasteful over-ordering.
Our Sydney concrete calculator uses precise formulas for slabs, driveways, strip footings and post holes. Enter your dimensions and get instant cubic metre (m³) results with a wastage allowance, giving you a reliable order quantity for any Sydney supplier.
Ready-mix concrete in Sydney costs between $200 and $280 per m³ in 2026, depending on grade and supplier. Our calculator provides realistic cost ranges based on current Sydney market pricing for both ready-mix deliveries and bagged concrete options.
For smaller DIY jobs, our calculator converts your project volume into the exact number of 20kg premix bags required. Based on the standard Australian rate of 108 bags per cubic metre as recommended by Boral — no guessing required.
Select your project type, enter dimensions, and get instant results
All Sydney concrete suppliers, including Boral, Hanson, and Holcim, price and deliver concrete in cubic metres (m³). Our Sydney concrete calculator handles all conversions automatically — just enter your measurements and select your project type.
Example: A 6m × 4m patio at 100mm thick = 6 × 4 × 0.1 = 2.4 m³ — plus 10% wastage = 2.64 m³ to order
Example: 20m of footing at 300mm wide × 300mm deep = 20 × 0.3 × 0.3 = 1.8 m³
Example: 8 holes, 300mm dia hole, 100mm post, 600mm deep = 8 × π × 0.6 × (0.15² − 0.05²) = ≈ 0.302 m³
Concrete pricing in Sydney varies by project type, access, concrete grade and whether you DIY or hire a concreting contractor. Use this guide as a reference before collecting quotes from local Sydney concrete suppliers and concreters.
| Project Type | Typical Area / Size | Volume (m³) | 20kg Bags | Material Cost Est. | Installed Cost (Sydney 2026) |
|---|---|---|---|---|---|
| Garden Path | 10 m² @ 80mm | 0.8 m³ | ~87 bags | $160–$224 | $700–$1,200 |
| Backyard Patio / Slab | 20 m² @ 100mm | 2.0 m³ | ~216 bags | $400–$560 | $1,800–$3,200 |
| Single Driveway | 30 m² @ 150mm | 4.5 m³ | ~486 bags | $900–$1,260 | $4,000–$7,000 |
| Double Driveway | 50 m² @ 150mm | 7.5 m³ | ~810 bags | $1,500–$2,100 | $6,500–$11,000 |
| Garage Slab | 36 m² @ 150mm | 5.4 m³ | ~583 bags | $1,080–$1,512 | $4,500–$8,500 |
| House Slab (small) | 100 m² @ 150mm | 15.0 m³ | ~1,620 bags | $3,000–$4,200 | $12,000–$22,000 |
| Strip Footings | 30m run @ 300×300mm | 2.7 m³ | ~292 bags | $540–$756 | $2,500–$5,000 |
| Retaining Wall Base | 20m run @ 400×400mm | 3.2 m³ | ~346 bags | $640–$896 | $3,000–$6,000 |
Understanding the right specifications for concrete projects in Sydney ensures compliance with Australian Standard AS 3600 and delivers long-lasting results in Sydney's coastal and clay-soil conditions.
The most common concrete grade for residential slabs in Sydney is N25 (25 MPa). For driveways and garage slabs subject to vehicle loads, N32 is recommended. Strip footings and house slabs in Sydney's reactive clay zones typically require N32 or N40 per your structural engineer's specification.
One cubic metre of concrete requires approximately 108 × 20kg bags of premix concrete. This is based on Boral and Cement Australia's standard yield of 0.0093 m³ per bag. For small jobs under 0.5 m³, bagged premix is cost-effective. For larger pours, ready-mix delivery from a Sydney batch plant is more economical.
Sydney concreting standards generally require: 75–100mm for footpaths and garden paths, 100mm for residential patios and shed slabs, 125–150mm for driveways, and 150–200mm for garage slabs. Always check with your local council and structural engineer for site-specific requirements.
For Sydney coastal suburbs including Manly, Bondi, Cronulla and Sutherland Shire areas, concrete exposed to salt spray requires a minimum N32 grade with 40mm cover to reinforcement. Marine-grade concrete or concrete with silica fume additives may be specified by engineers for structures within 1km of the ocean or estuaries.
Sydney ready-mix concrete trucks carry between 5 and 8 m³ per load. Most suppliers, including Boral, Hanson and Holcim, have a minimum order of around 0.5–1.0 m³ for short-load deliveries, which attract a short-load surcharge. Scheduling your pour on weekdays avoids weekend surcharges common with Sydney suppliers.
In Sydney's temperate climate, standard concrete reaches 70% of design strength within 7 days and full 28-day strength at four weeks. Hot summer days above 30°C require wet hessian curing or curing compound to prevent rapid moisture loss. Avoid pouring concrete during forecast rain or extreme heat above 35°C in Western Sydney.
Selecting the correct concrete grade ensures your Sydney project meets structural and durability requirements. Using under-strength concrete is a common and costly mistake — always confirm your grade with a licensed Sydney concreter or structural engineer.
| Concrete Grade | Strength (MPa) | Common Sydney Use | Price Range (per m³) | Notes |
|---|---|---|---|---|
| N20 | 20 MPa | Paths, garden edging, non-structural | $200–$220 | Entry-level; not for driveways |
| N25 | 25 MPa | Residential slabs, footpaths, patio | $215–$240 | Most popular residential grade |
| N32 | 32 MPa | Driveways, garage slabs, footings | $235–$260 | Recommended for vehicle traffic |
| N40 | 40 MPa | House slabs, retaining walls, coastal | $255–$280 | High-durability applications |
| N50 | 50 MPa | Commercial, structural columns | $280–$320+ | Engineer specified only |
Even experienced Sydney concreters add a minimum 10% wastage allowance. Sub-bases are rarely perfectly level and formwork flexes slightly during pours. Running short of concrete mid-pour on a hot Sydney summer day can result in cold joints — a costly structural defect.
Most Sydney concrete suppliers charge a short-load fee for orders under 3–4 m³. If your calculated volume is just under a threshold (e.g. 2.8 m³), it may be more economical to round up to 3 m³ and use the extra for a path edging or additional project rather than paying a short-load surcharge.
Sydney councils including City of Sydney, Waverley, Northern Beaches and Penrith all have varying requirements for residential concrete work. Driveways crossing council footpaths require a Section 138 Roads Act permit. Always check with your local council before pouring concrete in public zones or near boundaries.
Access AS 3600 Concrete Structures Standard and AS 1379 Specification for Ready-Mixed Concrete — the key Australian Standards governing all Sydney concrete projects.
Visit Standards Australia →Before hiring a Sydney concreter, verify their contractor licence on the NSW Fair Trading licence check portal. Concrete work over $5,000 in NSW requires a licensed contractor.
Check NSW Licences →Find permit requirements, footpath crossing applications and development approval guides for concrete work in the City of Sydney LGA and surrounding council areas.
City of Sydney Council →CCAA provides free technical guides on concrete mix design, curing, finishing and crack control — invaluable resources for DIY and professional Sydney concrete projects.
Visit CCAA →