Cement-Sand-Aggregate Mix Calculator
Convert finished concrete volume and a volume ratio into dry material volumes and approximate cement bags.
Estimate cement, sand and aggregate for a nominal mix
Convert finished concrete volume and a volume ratio into dry material volumes and approximate cement bags.
How the cement-sand-aggregate mix calculator works
The calculator applies an editable dry-volume factor to the finished concrete volume, then splits that dry volume according to the entered cement:sand:aggregate ratio. Cement volume is converted to mass using an editable bulk density and then into bags.
Where this construction calculation helps
Use this for preliminary material planning for nominal mixes, small non-critical works or cross-checking hand calculations.
Measurements and assumptions
The familiar dry-volume factor and bulk density are approximations, not universal constants. Moisture, voids, aggregate grading and mix design affect yield. Reinforced or structural concrete should be produced from the specified mix design, not a generic nominal ratio.
Worked example
For 1 m³ finished concrete with a 1:2:4 nominal ratio and 1.54 dry factor, dry material volume is 1.54 m³, divided across seven ratio parts.
Use nominal mix quantities as an estimate, not a structural design
This cement, sand and aggregate mix calculator converts a selected nominal proportion into approximate ingredient quantities. Actual concrete yield depends on moisture, bulking, aggregate grading, compaction and the relationship between dry ingredient volume and finished concrete volume. Structural concrete should follow the specified mix design, strength class and local code rather than a generic site ratio. For purchasing, add an appropriate site allowance and compare the calculated quantities with batching practice and supplier units.