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Concrete dosage and materials calculator
Estimate volume, cement bags and indicative materials for your pour.
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Enter your measurements
Volume = length × width × thickness. Cement = volume × dosage. Sand and gravel use indicative factors of 0.5 and 0.8 m³ per m³; water uses a 0.5 water-to-cement ratio.
Concrete volume
4 m³
Cement required
28 50 kg bags
Indicative sand
2 m³
Indicative gravel
3.2 m³
Indicative water
700 L
Indicative estimate. Check drawings, waste and product data sheets. This does not replace an engineering study.
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METHOD
An estimate you can verify
Geometric volume includes the selected waste allowance. Cement is rounded up to full bags. Aggregate and water figures are illustrative: real proportions depend on local materials, moisture and mix design.
Technical sourceFAQ
How many cement bags for 1 m³ at 350 kg/m³?
Seven 50 kg bags before waste. Required dosage comes from approved drawings or mix design.
Can this size a foundation?
No. It estimates quantities from already defined dimensions. It does not design reinforcement or verify structural safety.