Is the big pack really cheaper, and is "3 for £5" a good deal? Fill in up to four products and this calculator shows the price per kilo, per litre or per item, so you can compare like with like.
How to Use It
Enter the price, the number of packs and the size of each pack. For a multibuy such as 3 packs of 400g for £5, put 3 in the packs box, 400 in the size box and £5 as the price. You can compare grams with kilograms, or millilitres with litres: the calculator converts them for you. Products measured in different ways, such as a bottle of juice against a tub of ice cream, cannot be compared.
A Worked Example
A 400g pack costs £2.50, which is £6.25 a kilo. Two 300g packs for £4 come to 600g, which is £6.67 a kilo. The first looks smaller, but it is the better value, by about 7%.
Questions about Unit Price Calculator
What is a unit price?
A unit price is the cost of a standard amount of something, such as a kilo, a litre or one item. It lets you compare packs of different sizes fairly. Supermarkets must show it on the shelf label, but it is not always in the same unit from one product to the next.
Can I compare a multibuy with a single pack?
Yes. Enter the multibuy as several packs for one price, and the single pack as one pack. The calculator works out the price per kilo, litre or item for each, so the two can be compared directly.
Is the cheapest unit price always the best buy?
No. A bigger pack only saves money if you use all of it before it goes off or goes to waste. The calculator shows the price, and the decision about how much you will really use is yours.