Jack Tools

Unit Price Calculator

Compare products to see which one gives the best value per unit.

Compare two products

£
£

Enter the price and size of both products using the same unit type to compare value fairly.

Best value
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Compare two products to see which one costs less per unit.
Product 1 price per unit
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Product 2 price per unit
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Cheaper option
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Savings
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Comparison details

Unit type used —
Product 1 price —
Product 2 price —
Best-value difference —

How This Unit Price Calculator Works

This unit price calculator helps you compare two products to see which one offers better value for money. Instead of only looking at the shelf price, it works out the cost per unit so you can compare items fairly.

You enter the price and size of each product, then choose the unit type such as grams, kilograms, millilitres, litres, or items. The calculator then works out the price per unit for both options.

This makes it easier to compare different pack sizes, multipacks, and promotional offers when shopping for groceries, household goods, drinks, toiletries, and other everyday products.

It is especially useful when one product looks cheaper overall but actually costs more per gram, litre, or item than another option.

Product price Enter the total shelf price or purchase price for each product you want to compare.
Product size Enter the size, weight, volume, or quantity of each product using the same measurement type for both.
Unit type Choose the unit that matches the products, such as grams, kilograms, millilitres, litres, or items.
Best value The calculator shows which product has the lower price per unit and therefore offers better value.
Back to calculator ↑

Example Unit Price Comparisons

Rice comparison
Product 1£3.50 / 400g
Product 2£5.00 / 750g
Unit typegrams
Product 2 is better value
Shampoo bottles
Product 1£2.40 / 250ml
Product 2£4.20 / 500ml
Unit typemillilitres
Product 2 is better value
Pack of items
Product 1£6.00 / 12 items
Product 2£8.50 / 20 items
Unit typeitems
Product 2 is cheaper per item
Milk comparison
Product 1£1.20 / 1L
Product 2£1.80 / 2L
Unit typelitres
Product 2 is better value

Unit Price Calculator FAQs

A unit price calculator works out the price per unit for each product, making it easier to compare different sizes and see which option offers better value.
Unit price helps you compare products fairly, especially when pack sizes are different. A bigger item is not always better value unless the price per unit is lower.
Yes. For the comparison to be meaningful, both products should be entered using the same measurement type, such as both in grams or both in litres.
Yes. This calculator is useful for groceries, drinks, toiletries, cleaning products, bulk purchases, and any items sold by size, weight, volume, or count.
No. A lower total price does not always mean better value. The better-value option is the one with the lower price per unit.
Yes. Enter the total number of items in each pack and compare the unit price by item to see which multipack offers better value.

Related tools

Discount Calculator Check sale prices before comparing unit value. Percentage Calculator Compare savings and price changes in percentage terms. Calculator Use a basic calculator for quick price checks.