Concrete Calculator Ireland
Planning a shed base or new driveway? Quickly estimate your required cubic metres and standard 25kg bags for Irish projects.
Calculate Concrete for Shed Bases and Foundations
Welcome to ConcreteCalculator.website. Whether you are laying down a new concrete base for a garden shed or pouring deep foundation footings for a home extension, getting your concrete volume right is essential here in Ireland. Ordering too little from major ready mix suppliers like Kilsaran or Roadstone means you will end up paying hefty short load fees. On the flip side, buying too many bags from your local hardware store is just throwing money down the drain.
Using our Irish concrete calculator is as simple as it gets:
- Select what you are building: a concrete base, post holes for fencing, or concrete stairs.
- Enter your measurements. The tool is designed for the metric system, so just use metres for the length and width, and centimetres for the depth or thickness.
- Hit calculate to instantly get your exact cubic metres and see how many standard 25kg or 20kg bags you will need if you are mixing it yourself.
How Do You Calculate Cubic Metres of Concrete?
If you prefer to crunch the numbers manually without the calculator, figuring out concrete volume in cubic metres is quite straightforward. The golden rule is to ensure all your measurements are converted to metres before you multiply them together.
The Volume Formula: Length in metres multiplied by Width in metres multiplied by Depth in metres equals Total Cubic Metres.
Example for an Irish driveway: Let us assume you are pouring a driveway section that is 5 metres long, 3 metres wide, and 100 millimetres thick. First, convert your thickness to metres by dividing by 1000, which gives you 0.1 metres. Now multiply: 5 times 3 times 0.1 equals 1.5 cubic metres of concrete.
25kg Concrete Bag Calculator and Yields
If you are tackling a small weekend DIY job, you will likely pick up premixed bags of concrete from a local builders merchant. Across Ireland, the most common bag size sold is 25kg, though 20kg is also popular. Here is what you can expect a single bag to yield once it is mixed properly with water:
| Irish Bag Size | Approximate Yield in Cubic Metres | Bags needed per cubic metre |
|---|---|---|
| Standard 25kg Bag | 0.011 cubic metres | approx 90 bags |
| Standard 20kg Bag | 0.009 cubic metres | approx 110 bags |
Frequently Asked Questions
How do I calculate cubic metres of concrete?
To calculate cubic metres, simply multiply the length in metres by the width in metres and the depth in metres. For example, a 4 metre by 3 metre shed base that is 100 millimetres thick requires 1.2 cubic metres of concrete.
How many 25kg bags of concrete do I need for a cubic metre?
You will need approximately 90 standard 25kg bags of premixed concrete to make up one full cubic metre. Make sure to account for a little extra waste when purchasing.
Should I use bags or ready mix concrete in Ireland?
For small projects under half a cubic metre, bags from your local hardware store are perfectly fine. For anything larger like a driveway or deep foundations, it is much cheaper and easier on your back to order a ready mix delivery from suppliers like Kilsaran or Roadstone.
How to convert square feet to cubic metres?
First multiply your total square feet by your depth in feet to get cubic feet. Then divide that total by 35.31 to get your final measurement in cubic metres. Our tool does this automatically if you know your metric dimensions.