Unit Price Calculator โ Compare Prices
Compare the price per kg, litre, ounce or item across different sizes and brands, and see which product is the best value.
๐ Runs entirely in your browser โ nothing is uploadedWhy compare unit prices
Shelf prices are hard to compare because products come in different sizes: a 500 g pack at 2.49 against a 1 kg pack at 4.29, or a 750 ml bottle against a 1.5 litre one. The unit price removes the guesswork by converting every product to the cost of one common unit. Supermarkets in many countries print it on the shelf label, but it is often in a different unit from the one you are comparing, or missing for promotional items. This calculator lets you work it out yourself in seconds.
How the comparison works
Enter the price, the quantity on the package and its unit for each product. The calculator converts the quantity to a common base unit (grams, millilitres or items), divides the price by it, and shows the result in the unit you chose, for example per kilogram or per litre. The product with the lowest unit price is highlighted as the best value, and every other product shows the percentage extra you pay compared with it. You can mix units within a category, such as ounces and grams or fluid ounces and millilitres, which is handy when comparing imported products or shops that label in different systems.
Beyond the cheapest price
The lowest unit price is a strong guide but not the only factor. Multi-buy deals, loyalty prices and coupons change the real cost, so enter the final price you would actually pay. Think about shelf life and storage as well: buying a huge pack of perishable food that you cannot finish wastes the savings. For items sold by count, such as batteries, nappies or capsules, compare the price per piece, and remember that โper sheetโ or โper washโ are often the fairest measures for household goods.
Add up to ten products at once and use the table to copy the results. If you are comparing discounts rather than package sizes, the discount calculator may be a better fit. Everything is calculated locally in your browser and nothing is uploaded.
How to use
- Choose what to comparePick weight, volume or count, and the unit you want prices shown in, such as per kg or per litre.
- Enter each productType the price, the quantity on the package and its unit. Add more rows for more products.
- Find the best dealThe table shows the unit price of every item and how much more each costs than the cheapest.