Use the same unit
Convert ounces, pounds, litres, kilograms, count or another quantity to one common unit before comparing.
Include usable quantity
If part of a package is routinely wasted or expires, the theoretical unit price may overstate its value.
Separate unit price from total spend
The cheapest cost per unit can still require spending more cash or buying more than you need.
Use our calculator
Enter price and quantity for two options to see the normalized unit cost without relying on shelf labels.
General educational information only. Consumer rights, tax treatment, warranty obligations and return remedies vary by seller, product and jurisdiction. Use the actual contract/policy and current official consumer guidance where rights matter.