Work out bottle fill volume instantly with clear inputs, formula shown and shareable results.
Average-content filling law requires the mean contents to be at least nominal and very few packs below the tolerable negative error. Setting the target two standard deviations above nominal satisfies that, at the cost of give-away overfill — which is why reducing filler variability directly reduces product given away free.
Target fill
Target = nominal + 2 x filling standard deviation
Give-away
Overfill % = (target - nominal) x 100 / nominal; headspace = brimful capacity - target
Average quantity and tolerable negative error requirements are set by weights and measures legislation in each jurisdiction. Confirm the applicable rules and verification procedures before setting fill targets.
Half the packs would then be underweight. Average-content rules require the mean to be at or above nominal and limit how many packs may fall below TNE, so a safety margin above nominal is unavoidable.
By cutting filler standard deviation — better valve control, temperature stability, checkweigher feedback. Halving sigma halves the required overfill, which on high volumes is a large saving.