How each offer is worked out
- Pack size. Paid packs plus free packs, times the amount in each pack, gives the quantity you receive. kg and g, lb and oz, L and ml all convert to one base unit first.
- Shelf price. The displayed total divided by that quantity, scaled to 100 g, 100 ml or one item.
- Whole packs. If you enter a quantity you need, the offer is bought as many whole times as it takes to cover it. Anything beyond your need is surplus.
- Coupon and delivery. The coupon applies when the items subtotal reaches the minimum spend. Delivery is added once. The result is the checkout total.
Weight, volume and count are ranked separately, because 500 ml of oil and 500 g of rice have no honest common price.
Questions
What does the price per 100 g mean?
It is the price divided by the total weight, scaled to 100 g, so a 400 g pack and a 1.5 kg pack can be compared directly. Volume offers use 100 ml and count offers use one item.
How does buy-N-get-M work in the comparison?
Enter the packs you pay for and the packs that come free. The displayed total covers the paid packs, and the quantity you receive is paid plus free, so the unit price drops without you doing any extra sums.
When is the basket coupon applied?
The coupon applies only when the items subtotal reaches the minimum spend, and exactly at the minimum counts. A percentage is taken from the subtotal, a fixed amount is capped at the subtotal, and delivery is never discounted.
Why does the cheapest offer change when I enter a quantity?
Offers are bought as whole packs. A bigger pack can leave surplus you pay for, and delivery is charged once however many packs you buy, so the winner at 500 g can lose at 3 kg.
Want the worked examples behind the maths? Read how to compare Black Friday multipack deals, or count the days with the holiday countdown cards.