Concrete Calculator
Work out concrete volume and bags of premix needed for slabs, footings or columns.
Calculate the volume of concrete and number of premix bags needed for a slab, footing or column pour.
How to use it
- 1Choose the shape: slab, footing or column.
- 2Enter the relevant dimensions.
- 3Enter the bag yield and price to see totals.
Pour details
Choose a shape and enter its dimensions.
Result
Volume
1.200 m³
- Bags needed
- 121
- Total cost
- €726.00
Bag counts round up; add a 5–10% margin for spillage on larger pours.
Frequently asked questions
- How much does a 20kg bag of premix make?
- Roughly 0.01 m³ of mixed concrete; adjust the yield field if your product differs.
- Should I add extra for wastage?
- Adding 5–10% extra volume is common practice to cover spillage and uneven ground.
- What shapes are supported?
- Rectangular slabs, footings (as a long thin slab) and cylindrical columns.
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