Our Concrete Calculator makes it easy to estimate how much concrete you’ll need for your project. Simply follow the steps below:

1. Choose Your Project Type
   • Slab (e.g. driveways, patios)
   • Post Hole (e.g. fence posts)
   • Block Fill (e.g. masonry walls)
2. Enter Your Measurements
   • For slabs: enter length, width, and depth.
   • For post holes: enter diameter and depth.
   • For block fill: enter number of blocks and size.
3. Add a Safety Buffer (Optional but Recommended)
   • Tick the box to add a 5% safety buffer to account for spillage, over-excavation, and inconsistencies on site.
4. Click ‘Calculate’
   • The calculator will provide the required concrete volume

Disclaimer: This tool provides an estimate only. For project-specific advice, please contact our team directly.

No, the concrete calculator only estimates the concrete volume. You will need to consult with your builder or engineer for reinforcement and base prep.

Yes. We recommend adding a 5% buffer to ensure you’re not left short once the pour begins.

Absolutely. Whether you’re pouring a small path or a series of fence posts, this tool gives you a good starting point.

Yes. Select the post hole option, enter the number of holes, diameter, and depth. The tool will calculate volume accordingly.

A safety buffer ensures you’re covered for minor miscalculations, over-excavation, or surface irregularities that could otherwise leave you short when working out concrete volumes using the concrete calculator.

A concrete calculator is a tool that helps estimate the volume of concrete needed for a construction project based on user-provided measurements.

When correctly designed and maintained, permeable concrete offers comparable service life in low‑speed environments. Its compressive strength (10-15 MPa) suits light‑vehicle, pedestrian and landscaping loads.

Routine sweeping and occasional low‑pressure water blasting keep voids clear of silt and organic debris. For high‑traffic zones, annual vacuum‑suction cleaning is recommended.

Typical applications include footpaths, retaining walls, cycleways, car‑park stalls, driveways, patio areas, and tree surrounds. Contact our team to receive advice on your project.

By allowing rainfall to infiltrate the ground, permeable concrete limits surface ponding, reduces peak‑flow volumes entering council infrastructure, and assists with groundwater recharge. This can defer the need for costly detention tanks or enlarged pipes.

Permeable concrete is a specially designed no‑fines mix that allows water to pass through its highly interconnected voids, providing sustainable drainage and reducing storm‑water runoff compared with standard concrete.

Yes. SuperSlab offers improved R-value and thermal mass, creating a warmer floor. SuperSlab+ enhances this further with a fully insulated or edge-insulated system that exceeds standard thermal requirements. 

Not usually. Shear keys aren’t required under CodeMark unless specific seismic conditions apply. In seismic zones (e.g., Christchurch), shear keys are still recommended unless soil conditions indicate lateral spreading; however, this will be determined by an engineering team in the design process.  

Yes, BRANZ appraisal No.964 (2017) acknowledges that a SuperSlab flooring system complies with the New Zealand building code. If a SED is required, PS1 and PS4 statements will be required when lodging a consent. 

What is a PS1? A Design Producer Statement. This is confirmation from an engineer that it is designed to the New Zealand Building Code. 

What is a PS4? A Construction Review Producer Statement. This is confirmation from an engineer that it has been constructed in accordance with the details shown on the consented documents relating to the PS1. 

Yes. When CodeMark conditions are met, councils must accept SuperSlab. All supporting calculations and drawings are provided by the slab designer and can be submitted with your initial building consent or as an amendment. 

If your site qualifies as ‘good ground’, engineering isn’t required under CodeMark. If an SED is needed, design generally takes 3-5 working days. 

SuperSlab includes rib structures that average around 125mm of flat concrete. However, this is offset by savings in: 

• Excavation and disposal 

• Hard fill requirements 

• Block perimeter foundations 

Yes. Experienced contractors can install a SuperSlab in approximately 3 days. Traditional footings typically take around 2 weeks, resulting in significant time and labour savings. 

Yes. SuperSlab works well on sloping sites. Minor steps can often be poured in a single pour. For more significant level changes, the retaining wall footing is integrated into the lower slab, reducing excavation. Stepped floors may require SED. 

The standard SuperSlab system is designed for 2.5 kPa (suitable for residential garage loads). With specific design input, the system can be upgraded to handle loads up to 10 kPa. Reinforcement and topping thickness may vary for heavier applications. 

Yes. SuperSlab can be used on sites with an allowable bearing pressure starting at 50 kPa (as per Table 1 in the SuperSlab Technical Manual). For other ground conditions, a Specific Engineering Design (SED) may be required. The system can also span between piles on poor ground or deep topsoil, making it suitable for a wide range of land classifications. 

Yes, any qualified builder can construct a SuperSlab foundation when following the supplied plans and construction specifications. 

SuperSlab is a fully engineered and compliant concrete foundation system. It offers time and cost savings, while enhancing energy efficiency and structural strength. SuperSlab is CodeMark certified and BRANZ appraised for peace of mind. 

Yes. Ready Glow is ideal for this.

Ready Glow is off-white/light yellow in colour allowing it to blend seamlessly into surfaces.

Wherever you would like a unique design element and/or functioning renewable ambient light source.

Applications include:
Exterior: walls, patios, paths, stairs, driveways, concrete furniture
Interior: floors, walls, exits, stairs

Ready Glow is a non-toxic, non-radioactive
photo luminescent aggregate.

Ready Glow will continue to function in a cementitious or resin-epoxy matrix for 15+ years.

Yes and no. The curing time depends on several factors, with raw material availability being a key one.

In the South Island, achieving lower-carbon outcomes often requires cement substitutions. Depending on the time of year, these substitutions may slightly impact the initial setting time. In the North Island, this is less likely due to the availability of low-carbon cements.

Our Plant Engineers can optimise curing times based on your specific construction circumstances.

Yes, it can. We first assess the structural application and program performance before optimising the carbon footprint of your project. Allied Concrete provides expert guidance to ensure the best fit for each project.

Yes, using low-carbon concrete can help projects achieve Green Star, Homestar, and LEED certification points due to reduced embodied carbon.

Depending on the mix, CO₂ reductions of 20-80% can be achieved compared to standard concrete.

Properly designed low-carbon mixes offer comparable strength, durability, and workability to traditional concrete while reducing environmental impact.

Low-carbon concrete is designed to reduce carbon emissions by incorporating various methods, including the use of supplementary cementitious materials (SCMs), lower-carbon cement made in New Zealand, sustainable aggregate sourcing, and other initiatives. 

Anyone looking for concrete product information, FAQs, or help navigating our site.

Ready Thinners are used to adjust the viscosity of sealers and other concrete treatments for easier application. These concrete thinners allow for smooth and even coverage, helping to achieve a professional finish.

We stand behind Ready Acid Wash as the best concrete acid wash in New Zealand. Its concentrated formula effectively removes stubborn stains, efflorescence and salts, preparing concrete surfaces for optimal sealer adhesion.

Applying Ready concrete sealers is straightforward. Here are the detailed steps:

1. Clean the concrete surface thoroughly to remove any dirt, oil or debris. Use a pressure washer for best results, and allow the surface to dry completely.
2. If using the sealer on new concrete, treat the surface with Ready Acid Wash, a popular concrete acid wash in New Zealand, to remove latence and salts. Follow the detailed instructions for applying acid wash.
3. Stir the sealer well before use to ensure an even consistency.
4. Use a roller or sprayer to apply the sealer evenly across the concrete surface. Apply in thin, even coats to avoid pooling and ensure thorough coverage.
5. Allow the first coat to dry completely, typically for 24 hours. Avoid foot traffic on the surface during this time.
6. Apply a second coat if necessary, following the same method. Allow it to dry completely.
7. Let the concrete sealer cure fully before exposing the surface to heavy traffic or harsh weather conditions. This can take up to 72 hours.

By following these steps, you will achieve a durable and long-lasting finish on your concrete surfaces.

Yes, Ready Products can be used on both new and old concrete surfaces. For old concrete, keep the surface clean and free of contaminants before applying the concrete sealer, acid wash or thinner to achieve the best results.

You can request an EPD On-Demand by filling out the form on our website here. We’ll then create a customised EPD for your Ecrete™ project.

EPD On-Demand comes with a third-party verified EPD Process Certification. This certification ensures that all environmental data provided is accurate, reliable, and meets the highest standards of quality. You can trust in Allied Concrete’s commitment to transparency and sustainability. For more information on EPDs and their importance in sustainable construction, visit EPD Australasia.

While our previous EPD covered entire concrete mixes, EPD On-Demand is specifically tailored to projects using Ecrete™, offering project-specific data on carbon savings.

An EPD is a standardised document that provides detailed information about the environmental impact of a product, including its carbon footprint.

The cost of decorative concrete depends on several factors, such as the complexity of the design, the types and quality of materials used and the scale of the project. Basic staining or simple stamping patterns are generally more affordable, while intricate designs and advanced textural effects may cost more.
For specific pricing aligned with your project’s specifications, request a quote from us directly.

Typically, our decorative concrete solutions can last anywhere from 25 to 30 years or more. To ensure the longevity of your decorative concrete, make sure to do the following:
Regular cleaning — Sweep and wash the surface regularly to prevent dirt accumulation.
Apply a sealer — To protect the surface against moisture, stains and wear, apply a sealer every few years. This is especially important for exterior concrete.
Avoid harsh chemicals — Use gentle cleaning products specifically designed for use on decorative concrete to avoid damaging the surface.

SuperSlab+ is available throughout New Zealand. Please contact your local Allied Concrete plant to find out more; 0800 4 ALLIED.

Yes, QPODs are made from recycled material and 100% recyclable.

The R value is a function of the slab geometry. SuperSlab+ floors provide improved R value and thermal mass both of which contribute to a warmer floor. To further improve the R-value, SuperSlab+ can be used in conjunction with QuickSet or QuickEdge perimeter insulation. Refer to the Allied SuperSlab Technical Manual for further information.

Yes, both specific mixes can be either polished or incorporate colour to provide the desired look for your space.

Yes, the pods can be stacked for delivery and storage. A 180sqm floor able to be transported on a single axle trailer or the back of a Ute.

Yes, however this will require a specific engineered design.

The SuperSlab+ system uses slightly more concrete than the current SuperSlab system.

Yes, the unique interlocking pods and spacers make installation faster than using polystyrene pods.

When building on good ground SuperSlab+ requires two specific mixes: 202CSS (20MPa mix), 252CSS (25MPa mix), available in both 13mm and 19mm aggregates, both suitable for a 100mm line pump.
Refer to the SuperSlab Technical Manual, available in the Document library. 

Yes, SuperSlab and SuperSlab+ is the only sustainable CodeMark Certified raft foundation system in the market.

When building on good ground SuperSlab+ may be slightly more expensive than using traditional polystyrene pods, however costs can be offset with the reduction in environmental footprint, transportation and storage costs combined with speed of installation.

Yes, QPOD is a direct replacement for 1100mm x 1100mm x 220mm traditional polystyrene pods and can easily be substituted without the need for an engineered design when building on good ground as per NZS3604.
Refer to the SuperSlab Technical Manual available at in the Document Library. 

SuperSlab+ is an evolution of the raft foundation system using eco-friendly recycled pods in place of traditional polystyrene, available exclusively from Allied Concrete.