How much does the calculator account for wastage during pouring and vibration?

A standard wastage allowance is built into the calculator's output to cover typical spillage, over-excavation fill and minor losses during pouring and vibration. Poor formwork quality, inexperienced labour or a rushed pour can push actual wastage higher than this baseline, so treat the figure as a reasonable planning number rather than a guarantee. Good formwork preparation and adequate labour on pour day are the most effective ways to keep real wastage close to the estimate.