It estimates quantities of cement, sand, and aggregate required for concrete or mortar based on volume, mix ratio, and wastage allowance.
Mix ratio indicates proportions of cement : sand : aggregate. Example 1:2:4 means 1 part cement, 2 parts sand, 4 parts aggregate by volume.
Calculate cement volume from mix, convert to mass using cement density, then divide by bag weight (commonly 50 kg) to get number of bags.
Yes — include a standard wastage percentage (commonly 5–10%) to ensure you have enough material on-site.