Concrete Calculator
Choose a shape, enter its dimensions, and get the concrete volume needed plus an estimated bag count.
Default matches a common 25kg bag yield.
What this tool does
Choose a shape, enter its dimensions, and get the concrete volume needed plus an estimated bag count.
Formulas
Slab/wall: length × width × thickness. Round column: π × radius² × height. Circular slab: π × radius² × thickness. A waste percentage is added on top, and the bag count divides the total by your bag's stated yield.
Frequently asked questions
What waste percentage should I use?
5-10% is typical for straightforward pours; use more for complex forms or hand-mixing where spillage is higher.
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