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Concrete Calculator

Calculate how many bags of concrete for any slab. Dimensions to instant results. Free, no sign-up.

๐Ÿ“– Read the complete Concrete Calculator guide โ†’

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50kg Bags Needed

Formula

Volume = Lร—Wร—D | Bags = Volume รท 0.035 mยณ

Example

3mร—3mร—0.10m = 0.9 mยณ โ†’ 26 bags

Frequently Asked Questions

What mix ratio?

For general slabs: 1 cement : 2 sand : 4 aggregate. Structural work โ€” consult engineer.

Add extra bags?

Add 10% for wastage, spillage, and voids.

What concrete strength?

Residential slabs: C20/25. Driveways: C25/30. Structural: consult engineer.

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