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Made in NZ · For NZ buildersConcrete calculator for NZ slabs & footings
Volume for slabs, footings and post holes, the bag or ready-mix count, and the mesh — then priced into the actual quote, not a throwaway number.
No credit card · Cancel anytime · Works offline on site · Flat NZD pricing
Concrete volume, bags and cost in one place
A concrete pour comes down to volume — slab area × thickness, footing and pile sizes, post-hole diameters — plus an allowance for waste and over-dig. Convert that to cubic metres and you can decide between bagged mix and ready-mix, and work out the reinforcing mesh (SE62 is the common residential slab mesh) and starter bars.
Toolie does the volume and the reinforcing as part of the take-off, then prices the concrete, mesh, boxing and labour off a real NZ pricebook with regional rates — so the slab line in your quote is defensible, not a guess on the back of a dwang.
- Slab, footing, pile and post-hole volume in m³
- Post and pile holes with the post taken out — plus a gravel base and soil on top for fence posts
- Bag count of a real NZ product, or ready-mix with the small-load fee, with a waste allowance
- Reinforcing mesh and starter bars to NZS 3604
- Priced off a real NZ pricebook with regional rates for 59 towns and cities
- Flows into the full quote and the build programme
It’s part of the quote, not a separate tool
In Toolie this isn’t a one-off calculator — it feeds the actual priced quote and the build programme. Describe the job or drop in a PDF plan and Toolie runs the take-off, applies NZ site intelligence and prices it off a real NZ pricebook.
More on-site calculators
See all 17 builder calculators, the full feature guide, or how Toolie quotes a job.
Where do the saw cuts go?
See the driveway control-joint guide (3 m centres, ¼ depth, 24–48 h) — or let the slab designer lay out the joints and price the boxing and saw-cut metres on your quote.
Common questions
How do I calculate concrete volume?
Multiply slab area by thickness, and add footing, pile and post-hole volumes, plus a waste allowance. Toolie does this in cubic metres and converts it to a bag or ready-mix count.
How much concrete for a post hole?
Work out the hole volume, then take out the post or pile that sits in it - over the depth it is actually in concrete. Deck piles sit on a concrete pad; fence posts usually sit on gravel with soil on top. Toolie's calculator does all of this. Its post-hole preset is the ordinary pile from BRANZ Bulletin 560, where a deck pile footing is 200 mm deep, so 15 piles on 400 mm diameter footings with a 125 mm pile come to about 0.39 m3 with 10% waste. A fill-the-whole-hole calculator on a 600 mm deep hole would say about 1.24 m3.
Does it include reinforcing mesh?
Yes - the take-off includes mesh (SE62 is the common residential slab mesh) and starter bars to NZS 3604, not just the concrete volume.
Does it price the pour?
Yes - Toolie prices the concrete, mesh, boxing and labour off a real NZ pricebook with regional rates, as part of the quote.
Quote, comply and get paid — in one place
Start free today. Built around NZS 3604, H1, Healthy Homes & CCA 2002. One flat price for your whole crew.
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