Unit Price Calculator
Compare two products by their price per unit to find the real bargain. The bigger package is not always the better deal, and this tool shows you which one wins.
Product A
Product B
Guide
How it works
Shops price items in different pack sizes, which makes it hard to compare them at a glance. The unit price, the cost for one gram, ounce, litre, or item, puts every option on the same footing. The lowest unit price is the better value.
How it works: Unit price = total price divided by quantity. Enter both products in the same unit (both in grams, or both in ounces, and so on), and the calculator shows the cost per unit for each, which one is cheaper, and the percentage you save by choosing it.
Bulk and family sizes usually win, but not always. Promotions, loyalty prices, and odd pack sizes regularly make the smaller pack cheaper per unit, which is exactly the trap this tool helps you avoid.
Do both products need the same unit?expand_more
Yes. Enter both quantities in the same unit, such as grams against grams or fluid ounces against fluid ounces. If one is listed in kilograms and the other in grams, convert first so the comparison is fair.
Is the bigger package always cheaper per unit?expand_more
No. Larger sizes are often, but not always, cheaper per unit. Sales on smaller packs, multi-buy offers, and premium 'convenience' large sizes can flip the result, which is why checking the unit price is worth the few seconds it takes.
What counts as a unit?expand_more
Whatever you measure the product in: grams, kilograms, ounces, pounds, litres, millilitres, or simply the number of items such as tablets or sheets. Just keep the unit consistent across both products.
Should I always buy the lowest unit price?expand_more
Usually, but not blindly. A larger pack only saves money if you actually use it before it expires or goes stale. For perishable goods, the cheapest unit price can still be a false economy if half of it ends up in the bin.
Next steps