What is a 1:2:4 concrete mix ratio?

It means 1 part cement, 2 parts sand, and 4 parts coarse aggregate by volume before water is added.

How many cement bags are needed for 1 cubic meter concrete?

It depends on mix ratio. For nominal 1:2:4 mix, cement demand is commonly around 6 to 6.5 bags per cubic meter depending on dry volume factor assumptions.

Why use dry volume factor in concrete mix calculation?

Dry materials occupy more volume than compacted wet concrete because of voids and bulking, so estimators multiply wet concrete volume by a dry volume factor (often 1.54).

Cement Mix Estimator

Concrete Mix Calculator

Estimate cement, sand, and aggregate for concrete mix ratios (1:2:4, 1:1.5:3, custom) with dry volume factor, bag count, and batch cost.

Full material split
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Custom ratios
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Calculate Mix Cement Calculator

Mix Ratio Calculator

1:2:4 nominal mix · 1 m³ wet volume · 50 kg bags

Material Split Preview

Concrete Volume (m³)

Mix Ratio (select)

Custom and Cost Inputs

Cement Part

Sand Part

Aggregate Part

Dry Volume Factor

Cement Bag Weight (kg)

Cost per Cement Bag ($)

Reviewed by Construction Estimation Team · Updated May 2026

Cement Bags—

Cement Volume—

Sand Volume—

Aggregate Volume—

Cement Cost—

How this concrete mix calculator works

Wet concrete volume is multiplied by a dry volume factor, then split by cement:sand:aggregate parts. Cement weight uses 1440 kg/m³ density; bag count rounds up to whole bags.

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