Compare two package sizes to find which one is actually the better deal per unit.
Unit price divides total cost by quantity, giving a directly comparable per-unit cost regardless of package size: unit price = total price ÷ size. Whichever product has the lower unit price is the actual better value, even if its sticker price is higher.
This matters because bigger packages aren't automatically cheaper per unit — bulk pricing, sales, and store-brand markups can all break the assumption that larger equals better value.
Grocery stores in many regions post a 'unit price' tag on the shelf already, but it's not universal, and it's not always in directly comparable units (ounces vs. count, for instance) — this tool normalizes that.
A $4.99 12oz product ($0.4158/oz) versus a $7.49 20oz product ($0.3745/oz): the larger package is the better deal despite the higher sticker price.
Retailers price based on demand, shelf placement, and promotions as much as raw economics — a 'family size' package is sometimes priced at a worse per-unit rate than the regular size, especially during sales on the smaller option.
Yes — ounces, count, sheets, loads, anything with a consistent quantity measure on both products works, as long as you're comparing the same kind of unit on both sides.
Convert both to the same unit first (using one of the site's unit converters if needed), since comparing price-per-ounce against price-per-gram directly wouldn't give a meaningful answer.