Concrete column calculator (round or square)
Choose the column shape, enter its size, height and number of columns to get the total volume with waste.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter column shape, diameter or side, height, number of columns and waste allowance.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Round column: π × (diameter ÷ 2)² × height. Square column: side² × height. Then × count × (1 + waste ÷ 100).
Example
Inputs: Column shape = Round, Diameter or side = 30 cm, Height = 3 m, Number of columns = 4, Waste allowance = 5 %. Result: Volume to order (with waste): 0.891 m³; Volume of one column: 0.2121 m³; Net volume, all columns: 0.848 m³.
Limits and caveats
- Does not subtract the rebar volume, which is usually small next to the concrete.
- For rectangular columns use the general concrete calculator with length and width.
Questions about this tool
How much concrete for a 30 cm round column 3 m tall?
π × 0.15² × 3 = about 0.212 m³ per column before waste.
Should I enter the inner or outer diameter of a tube form?
Use the inner diameter, since that is the diameter of the concrete column you will get.
Why does a square column take more concrete than a round one of the same size?
A 30 cm square has 0.09 m² of section while a 30 cm circle has only 0.0707 m², about 21% less.