Concrete Mix Calculator

Mixing concrete on site means every material must arrive together, in proportion. Give this calculator a volume and a mix ratio and it returns the complete batch list — including the water quantity from your water–cement ratio, the detail most quick calculators skip.

Full batch quantities for a mix — cement, sand, aggregate and water.

Wet concrete volume (m³)

Mix ratio — cement part

Mix ratio — sand part

Mix ratio — aggregate part

Water–cement ratio (typical 0.45–0.55)

Common mixes: M20 = 1 : 1.5 : 3 (columns, beams) · M15 = 1 : 2 : 4 (slabs, floors) · M10 = 1 : 3 : 6 (levelling, foundations).

Cement required

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Cement bags (50 kg)

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Sand required

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Aggregate required

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Mixing water

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Sand / aggregate in cubic feet

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Enter valid values in every field to see your result. Check for blanks, text in number fields, or a combination that cannot be calculated (shown in the notes under How it works).

How it works

Dry volume = wet volume × 1.54. Material volumes follow the ratio parts: cement = dry volume × cement part ÷ total parts, and likewise for sand and aggregate. Cement weight = cement volume × 1,440 kg/m³; bags assume 50 kg. Water = cement weight × water–cement ratio, in litres. Too much water weakens concrete — stay inside the typical 0.45–0.55 band unless your engineer specifies otherwise.

More tools: All calculators · Cement Quantity Calculator · Gravel Calculator

Estimates only — not financial, tax, or professional advice. Figures depend entirely on the values you enter; confirm important decisions with a qualified professional.