Planning a concrete project and not sure how much you need to order? Whether you're laying a patio, pouring a driveway, setting fence posts or building foundations, getting the right volume of concrete is essential. Order too little and you'll face delays. Order too much and you're paying for what you don't need.
That's why we've created our free Concrete Volume Calculator — a simple tool that does the maths for you in seconds.
How the Calculator Works
Our calculator is designed to be quick and easy to use, even if you're not confident with measurements. Just follow these steps:
- Select your shape — choose from a rectangle, triangle or circle depending on the area you're working with.
- Enter your dimensions — input the length, width (or diameter) and depth of the area to be concreted. You can enter measurements in metres, centimetres, millimetres or inches — whichever you're most comfortable with.
- See your result — the calculator instantly shows the estimated volume in cubic metres (m³), which is how concrete is ordered in the UK.
There's also an optional Reserve % field. Because there's rarely a perfect pour, you may want to add a small percentage — typically 5–10% — to allow for wastage, uneven ground or slight variations in depth. It's much better to have a little extra than to run short mid-pour.
Why Cubic Metres?
In the UK, ready-mix concrete is measured and delivered in cubic metres (m³). To give you an idea of scale, a typical patio measuring 4 metres by 3 metres with a depth of 100mm would need approximately 1.2m³ of concrete. Our calculator handles the unit conversions automatically, so you don't need to worry about converting millimetres to metres yourself.
