Choose the exact matching product
Choose the exact product and supported target unit before entering the target and held stock. The liner pack supplies 30 matching bags, the zipper box 12, and the selected film roll 40 declared metres. These are separate bases. A bag-count target cannot use a film roll as if it contains a known number of wraps.
Subtract stock in the same unit
For 55 matching zipper bags with 7 held, 48 more are wanted. Four complete 12-bag boxes add 48, bringing stock to 55 with no surplus. For 85 declared metres of matching film with 10 held, 75 metres are wanted;two 40 m rolls add 80 and leave 90 total, 5 above the target. These are chosen arithmetic inputs, not household recommendations.
Round to complete retail packs
If held stock already meets the target, the tool returns zero additional packs. Blank, negative, fractional, exponent and over-limit counts remain unresolved. Unknown counts or a requested film-length basis for a bag selection are refused. Nominal litres are not converted into bag area, food portions or storage duration.
Refuse an unsupported conversion
Check the actual received pack and relevant condition before counting held stock as matching. Different sizes, versions or uses do not automatically combine. The tool does not reserve supply, validate safe reuse or estimate household use-days. Confirm the actual current quote, storage and delivery before purchasing the calculated whole units.
A purchase case to keep explicit
For 55 medium zipper bags with 7 held, the exact 48-bag difference is met by four 12-count boxes. A 15-count small-bag box changes the product and denominator. Do not substitute it while retaining the medium dimensions or use instructions in the calculation.
Sources & scope
Checked November 5, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or retailer instructions. Current received labels and independent materials/food-contact/content/commerce review remain pending.
Tesco GB tie-handle bin liners321788728 ↗
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