Work out how much concrete you need for a slab, footing, round pad or column in seconds. Get cubic metres, litres and cubic feet, then add waste allowance so you can order with more confidence.
Choose the shape, select your units, enter the dimensions and the tool will work out the concrete volume you need.
Enter your dimensions to see the concrete volume, waste-adjusted amount and practical ordering guide.
Instead of guessing how much concrete to order, you can turn your measurements into a usable figure quickly. That helps with budgeting, ordering, comparing bagged concrete against ready-mix and avoiding obvious under-ordering.
Waste allowance is sensible when the excavation is uneven, shuttering is imperfect, depths vary, or the site is awkward. For tidy straightforward pours, a lower percentage may be enough. For rougher jobs, allow more.
For very small jobs, bags can make sense. As volumes rise, ready-mix often becomes the easier option and usually saves effort, time and site mess. This page gives both views so users can make a more grounded decision.
Pick the option that best matches the job: slab, footing, circular pad or column.
Use metric or imperial, then enter the measurements as accurately as possible.
Review the concrete volume, add waste, then use the bag or ready-mix guide to plan the order.
| Project | Example size | Approx volume | With 8% waste | Notes |
|---|---|---|---|---|
| Shed base | 3m × 2m × 0.1m | 0.60 m³ | 0.65 m³ | Common small domestic pour |
| Patio sub-base slab area | 5m × 3m × 0.1m | 1.50 m³ | 1.62 m³ | Useful when pricing groundwork |
| Hot tub / bin store pad | 2m × 2m × 0.15m | 0.60 m³ | 0.65 m³ | Thicker pad for heavier loading |
| Strip footing | 10m × 0.45m × 0.3m | 1.35 m³ | 1.46 m³ | Simple straight footing example |
| Round pad | Radius 1m × depth 0.15m | 0.47 m³ | 0.51 m³ | Good for small circular bases |
| Column | Radius 0.2m × height 2.4m | 0.30 m³ | 0.32 m³ | Helpful for post and column planning |
Take dimensions from the finished area you want filled, not rough guesses from memory.
A small increase in depth can add a surprising amount of volume, especially on larger slabs.
Even if bagged concrete looks possible on paper, site access and handling time can push the job toward ready-mix.
For many domestic jobs, around 5% to 10% is a sensible planning range. Simple tidy pours may need less, while rougher excavation or awkward formwork can justify more.
Both. The main calculation works out the volume first, then gives a practical guide for either ready-mix ordering or approximate bag numbers.
You can switch between metric and imperial. The outputs are shown in cubic metres, litres and cubic feet so the result is easier to compare.
Yes. Use the strip footing option for long rectangular trench-style pours and the slab option for wider rectangular areas.
No. It is a strong estimating tool, but the final order still needs common sense and proper judgement around depth, reinforcement, site conditions and the exact mix required.
Handyy covers Corsham and surrounding areas for practical property work and installation jobs. If you already know the size of the pour and want help with the next stage, get in touch.
