Unit Price Calculator
Compare prices per unit with this free online unit price calculator — enter price and size in g, kg, oz, lb, ml, L or items to find the best value deal.
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Part of the toolkit
How to use Unit Price Calculator
- 1Enter each product's price and size, with the unit (g, kg, oz, lb, ml, L, fl oz, gal or items) and number of packs
- 2Add up to 8 options — sizes can use different units of the same kind
- 3See the price per unit for each, the best value highlighted and how much cheaper it is
Frequently asked questions
How do you calculate unit price?▾
Divide the price by the quantity: unit price = price ÷ amount. For example, $5.99 for 1 kg is $5.99 per kg, while $3.49 for 500 g is $6.98 per kg — so the 1 kg pack is the better deal.
Can I compare different units, like ounces and grams?▾
Yes. Weights (g, kg, oz, lb) are converted to the same base, as are volumes (ml, L, fl oz, gallons). You can't compare weight with volume directly, because density differs between products.
Is the bigger pack always cheaper?▾
Often, but not always. Stores sometimes price large packs higher per unit, and multi-buy offers or discounts on smaller sizes can beat them. Comparing unit prices is the only reliable way to know.
How do I compare multipacks?▾
Enter the size of one item and the number of packs — for example 330 ml × 6. The calculator multiplies them to get the total amount before working out the unit price.
What does 'per 100 g' mean on price labels?▾
It's the unit price shown on shelf labels in many countries: the cost of 100 grams of the product. It lets you compare packs of different sizes at a glance.
Should I always buy the lowest unit price?▾
Only if you'll use it all. A bigger pack that goes to waste costs more in the end, so consider shelf life, storage space and how quickly you use the product.
Embed Unit Price Calculator on your website▾
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