Concrete Volume Calculator
How much concrete do I need?
Whether you're setting posts, laying pads, or pouring a small slab, our Concrete Volume Calculator helps you work out how many bags of Strongcrete Concrete you'll need for the job. Just pop in your dimensions and let the calculator crunch the numbers, so you don’t end up short (or with a mountain of mix left over).
Perfect for DIY jobs and tradie setups alike. Whether it’s for a small footpaths, fence posts, or pergola slabs.
Disclaimer:
This calculator is a guide only and assumes standard site conditions and consistent pour depth. Actual volumes may vary based on ground compaction, surface levelling, waste, and real-world surprises like voids or trenches.
Always allow for a little extra. We recommend rounding up or adding 5–10% buffer to cover miscalculations or spillage.
WBS Henderson provides timber and concrete gear - not structural engineering advice. For large-scale or critical pours, consult a qualified professional.
Address:
32 Henderson Valley Rd
Henderson
Auckland, 0612
Henderson
Auckland, 0612
Got Questions?
Not quite sure what you need, or how much of it? No worries, just flick us a message! Whether you’re stuck on post spacing or just need a second opinion, we’re here to help. We aim to get back to you within 24 hours (Sunday excluded of course; the boss insists we get one day off to crack into our own DIY jobs at home).
Fill in the below and we will get back to you in a jiffy.