Unit Price Calculator
Which is the better deal? Enter the price and size of two items to get each price per unit — and see which one is actually cheaper, the way store shelf tags do.
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Learn moreBigger isn’t always cheaper
The unit price — cost divided by size or count — is the only fair way to compare products in different package sizes. The larger “value” size is usually but not always cheaper per unit, and sales can flip the math. Use the same unit for both items (ounces, sheets, count) so the comparison is apples-to-apples.
How it’s calculated & sources
Unit price = price ÷ size (or count) for each item. The lower unit price is the better deal; the percentage shows how much cheaper it is than the other option.
Benchmark: the lower price-per-unit is the better value — the same measure required on U.S. store unit-price shelf labels.
Results update as you type and are general estimates, not personalized advice. Verify with a professional.
Worked example
A 32-oz jar at $4.99 is about $0.156/oz; a 64-oz jar at $7.49 is about $0.117/oz — the big jar is roughly 25% cheaper per ounce.
Frequently asked questions
Is the bigger size always cheaper?
Usually, but not always — sales, coupons, and odd package sizes can make the smaller one cheaper per unit. Always check.
What unit should I use?
Any, as long as it’s the same for both items — ounces, grams, sheets, or count. Mixing units breaks the comparison.
Does unit price account for waste?
No — if you can’t use the larger size before it spoils, the cheaper unit price may not be the better buy for you.