How it is calculated
Unit price = price ÷ quantityAll quantities are converted to the same unit (kg, litre or piece), then products are ranked cheapest first, with the saving.
Worked example
Oil: 1 L for 22 vs 5 L for 99: price per litre 22 vs 19.8, so the big bottle is 10% cheaper.
Frequently asked questions
Is the bigger pack always cheaper?
No — sometimes promotions make smaller packs cheaper, so compare unit prices.
Deals like 3 for 2?
Enter the total price and total quantity (e.g. 3 items for the price of 2).
Does expiry matter?
Yes — a bulk pack is no saving if it expires before you use it.