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 quantities for concrete using common mix ratios (1:2:4, 1:1.5:3, and custom). Useful for site batches, small pours, and material planning.

Full material split
Realtime results
Custom ratios
Mobile friendly

Mix Ratio Calculator

Enter concrete volume and ratio

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.

Cement calculator | Concrete calculator

Concrete Mix Calculator

Custom and Cost Inputs

How this concrete mix calculator works