Total Concrete Required
0 m³
Including wastage allowance
Instant concrete volume, bag count & cost estimates for Brisbane QLD projects
Use our free Brisbane Concrete Calculator to estimate concrete for slabs, driveways, footings, columns and steps. Accurate 2026 Brisbane pricing — no sign-up required.
Trusted by builders, concreters and owner-builders across Greater Brisbane and South East Queensland
Calculate exact concrete volumes in cubic metres (m³) for slabs, driveways, footings, columns and steps. Our Brisbane Concrete Calculator uses AS 3600-compliant formulas to ensure you order the right amount — no waste, no shortfall on your Brisbane project.
Get instant cost estimates using real 2026 Brisbane and South East Queensland ready-mix pricing. Compare delivery vs bagged concrete from Bunnings or Total Tools, and understand minimum truck load requirements from Brisbane suppliers like Hanson, Holcim and Boral.
Designed for Brisbane's subtropical climate with guidance on hot-weather concrete pouring, reactive soil types across inner-city and outer suburbs, and Brisbane City Council DA/CDC requirements. Includes N20 to N40 grade selection with correct wastage factors.
Select your project type, enter dimensions, choose grade and get instant results
Brisbane is one of Australia's fastest-growing cities, and concrete is at the heart of every residential and commercial construction project across the Greater Brisbane region. From slab-on-ground house foundations in Ipswich to pool surrounds in the Sunshine Coast hinterland and driveway replacements in Logan, accurate concrete volume calculations prevent costly over-ordering or dangerous under-ordering mid-pour. Our Brisbane Concrete Calculator is built for Queensland conditions, using AS 3600 formulas and local 2026 pricing data from South East Queensland suppliers.
N20 (20 MPa): Garden paths, non-structural pads, small piers, letterbox footings
N25 (25 MPa): Driveways, residential slabs, strip footings — most popular in Brisbane
N32 (32 MPa): Garage floors, structural footings, retaining walls, pool surrounds
N40 (40 MPa): Commercial slabs, high-load columns, engineered structures
75–100mm: Footpaths, garden paving, alfresco edges
100mm: Standard residential slab — most common in Brisbane LGA
125–150mm: Driveways, carports, high-traffic areas
200mm+: Garage floors with heavy vehicles, commercial
Waffle Pod: Very common in Brisbane on Class M/H clay sites — engineer to specify
Ready-Mix Delivered: $200–$260 per m³ (Brisbane metro & SEQ)
Mini-Mix Trucks: From 0.2 m³ — ideal for small Brisbane jobs
20kg Bagged: ~$8–$12 per bag (Bunnings, Total Tools Brisbane)
Labour Rate: $65–$95 per m² (pour, finish & cure)
Delivery Surcharge: $150–$400 depending on suburb and load size
Every calculation in this Brisbane Concrete Calculator uses standard volumetric formulas aligned with Australian Standard AS 3600 and adopted across the Queensland construction industry. All outputs are in cubic metres (m³) — the unit used by every ready-mix supplier in Brisbane.
Brisbane Example: 6m × 4.5m driveway at 125mm thick:
Brisbane Example: 12m run, 0.45m wide, 0.35m deep footing:
Brisbane Example: 6 deck piers, 300mm dia × 0.8m deep:
Brisbane Example: 5 steps, 175mm rise, 280mm run, 1.5m wide:
Tip: For any Brisbane job over 0.5 m³, ready-mix delivery is far cheaper than bagged concrete from a hardware store.
Choosing the right grade is critical. Brisbane's AS 3600-regulated construction industry requires correctly specified concrete for each application. Major Brisbane suppliers including Hanson, Holcim, Boral, Readymix and Wagners serve the Greater Brisbane metro area with competitive pricing.
| Concrete Grade | Strength | Common Brisbane Applications | Ready-Mix Price (per m³) | 20kg Bags per m³ | Labour (per m²) |
|---|---|---|---|---|---|
| N20 | 20 MPa | Garden paths, small pads, non-structural piers | $200 – $220 | ~111 bags | $60 – $75 |
| N25 | 25 MPa | Driveways, house slabs, strip footings, alfresco | $215 – $240 | ~111 bags | $65 – $85 |
| N32 | 32 MPa | Garage floors, pool surrounds, structural footings | $230 – $250 | ~111 bags | $70 – $90 |
| N40 | 40 MPa | Commercial slabs, high-load structures, civil works | $245 – $265 | ~111 bags | $80 – $95 |
Slab/Driveway: Flat horizontal surface — most common Brisbane project
Footing/Strip: Below-ground foundations for walls, fences or extensions
Column/Pier: Vertical supports for decks, pergolas or stumps
Steps: Concrete entry stairs or garden steps common in Brisbane's hilly inner suburbs
Measure carefully: Use a tape measure and note all dimensions in metres
Slab thickness: 100mm for standard Brisbane slabs; 125mm for driveways
Multiple sections: Calculate each area separately, then add the volumes together
Subtract openings: Deduct area of any drainage pits, garden beds or steps from slab totals
N25: Correct for most Brisbane driveways, slabs and footings
10% wastage: Standard for flat slabs with experienced Brisbane concreters
15–20%: Use for irregular shapes, sloping Brisbane block sites or DIY pours
Never short: Running out mid-pour causes cold joints — a structural defect
m³ total: Provide this to Brisbane suppliers for an accurate ready-mix quote
Bag count: Useful for small DIY repairs and post holes under 0.5 m³
Truck minimum: Most Brisbane ready-mix trucks have a 1.0 m³ minimum; mini-mix from 0.2 m³
Budget: Add delivery ($150–$400), pump hire ($400–$700) and labour separately
⚠ Brisbane Soil Alert: Much of Greater Brisbane sits on reactive clay (Class M, H1 or H2 sites). On reactive sites, your structural engineer may specify a waffle pod slab, deeper footings or a specific concrete grade. Always obtain a soil classification report before finalising your concrete design. This is especially important in suburbs like Eight Mile Plains, Calamvale, Springfield, Caboolture and Ipswich.
📌 Brisbane Pro Tip: For jobs over 3 m³ in Brisbane, ready-mix delivery from Hanson Concrete (Acacia Ridge, Rocklea), Holcim (Eagle Farm, Wacol) or Wagners Concrete (Toowoomba / SEQ) is dramatically cheaper than bagged concrete. Always get 3 quotes and book at least 3–5 days ahead. Avoid pouring in Brisbane's summer heat (above 32°C) without a retarder admixture — concrete can flash set before you finish screeding.
📖 AS 3600 & Brisbane City Council: All structural concrete in Brisbane must comply with AS 3600 Concrete Structures. Driveway crossings require approval from Brisbane City Council. Slabs over 60 m² or within flood overlay areas need a CDC or DA. Check the Queensland Development Code for exempt development thresholds before starting.
Check driveway crossing permits, development approval requirements and flood overlays for your Brisbane property before starting any concrete work.
Visit BCC Website →Australian Standard for Concrete Structures — the governing document for all structural concrete specification and design in Queensland and nationwide.
Standards Australia →The QDC sets out building rules for residential and commercial construction in Queensland, including exempt development thresholds for concrete work.
QLD Building Rules →Technical guidance, mix design best practice, hot-weather concreting guides and professional standards for residential and commercial concrete in QLD.
Learn More →