Concrete Calculator

Estimate slab volume, including your chosen waste allowance.

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Behind the answer

How to calculate

Volume (m³) = length × width × thickness ÷ 100

5 m × 3 m × 10 cm needs 1.5 m³, or 1.65 m³ with 10% extra.

This is a volume estimate for rectangular slabs, not structural advice.

Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.