Unit Price Comparison
Which pack is actually cheaper, once everything is priced per kilo, per litre or per piece.
Runs entirely in your browser
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How to use
- Enter each option's price and the size of one item.
- For a multipack, put the size of one item and how many are in the pack.
- Read the per-unit column: everything is converted to the same unit.
- The percentage is how much more that option costs than the cheapest.
Features
- Grams and kilograms, millilitres and litres, or a plain count.
- Multipacks handled: size of one item times how many.
- Refuses to compare mass with volume rather than producing a meaningless number.
- Shows the premium over the cheapest option, which is the number that decides.
- Runs entirely in your browser.
Frequently asked questions
- Why can I not compare a kilogram with a litre?
- Because the answer would be meaningless without knowing the density of what is inside. A litre of oil and a kilogram of oil are different amounts, and the ratio differs for every product. The tool refuses rather than dividing two numbers that do not belong together.
- Why is the bigger pack sometimes worse value?
- Because it often is. The assumption that a larger size is cheaper per unit is exactly what this checks, and supermarkets price against that assumption regularly — particularly on promotion, where a multipack can cost more per item than a single one on offer.
- Should I always buy the cheapest per unit?
- Only if you will use it. Per-unit price ignores waste, storage and how long the thing keeps; a kilo of something that spoils in a week is not a saving. The number tells you the price, and the rest of the decision is yours.
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