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Unit Price Calculator

Enter the price and quantity of two items to see which is cheaper per unit.

How it is calculated

The tool puts two offers on the same footing by dividing each price by its quantity: unit price = price / quantity. Price is what you pay in total for the pack, and quantity is how many units, grams, litres or sheets it contains. Both products must use the same unit of measure, so convert first if one is in grams and the other in kilograms. The product with the lower unit price is named the cheaper one, and the saving is (1 − cheaper unit price / dearer unit price) × 100, shown as a percentage of the dearer unit price. Equal unit prices are reported as a tie. Price may be zero, but quantity must be greater than zero. Unit prices are rounded to two decimals, so for tiny amounts, compare per 100 g or per 100 units.

Worked example

Product A is a 6-pack for 4.80, and Product B is a 10-pack for 7.00. Unit price of A: 4.80 / 6 = $0.80 each. Unit price of B: 7.00 / 10 = $0.70 each. B is lower, so the tool names Product B as cheaper. The saving is 1 − 0.70 / 0.80 = 0.125, or 12.50% less per unit than buying A. Over 30 units that is 3.00 saved, as long as you will actually use that many.

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Common mistakes

  • Comparing packs in different units, such as 500 g against 1.2 kg, without converting to the same unit first.
  • Typing the price per kilogram in the price field while the quantity is in grams.
  • Choosing the bigger pack automatically; the cheaper unit price only helps if you will use it all before it spoils.
  • Ignoring a promotion that applies to only one of the two, such as 3 for 2 or a loyalty discount, instead of entering the price you actually pay.
  • Entering the number of packs rather than the number of units inside each pack as the quantity.

Sources

About this calculator

This tool converts the price and quantity of two products into a common price per unit — per gram, per liter, per item, whatever unit fits — so you can compare them on equal terms even when the package sizes are completely different. A bigger package isn't automatically the better deal, and manufacturers frequently change pack sizes specifically to make direct comparison harder at a glance.

Shoppers use it standing in a supermarket aisle to decide between, say, a 750 g jar and a 1.2 kg jar of the same product at different prices (enter both quantities in the same unit, for example 750 and 1,200 grams), or between store brands and name brands. It's equally useful for bulk-buying decisions, subscription boxes, or any purchase where the listed total price alone doesn't tell you which option is actually cheaper.

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Comments (1)

  • Editorial team

    Multipacks are where mistakes creep in: a pack of 6 cans of 330 ml is 1980 ml in total, and that total is the quantity to type, not the 6. Keep both products in the same unit before comparing. Even when one side wins by a few percent, a cheaper unit price only helps if you will use it all, so for fresh food a smaller pack may still cost less in practice. Which two products are you weighing up?

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