Cotco is a free Canadian cost-checking site: compare unit prices, look up barcodes, search recalls, and see what things have actually cost. Start here
Tools
Calculators
Every calculator runs in your browser on the numbers you enter. Nothing is stored, nothing is estimated for you, and each result shows the arithmetic underneath so you can check it.
Unit price calculator
Which package costs less per 100 g, kilogram, litre, or item?
Compare two to four options, normalize mixed units automatically, and see the dollar difference across the amount you actually plan to buy.
Bulk buying calculator
Is the big package actually cheaper once waste is counted?
Adds spoilage and unused product to the comparison, and tells you the waste rate at which the bulk deal stops being a deal.
Cost per use calculator
What does this cost every time you use it?
Purchase price plus maintenance, minus resale value, divided by realistic uses. Useful for tools, shoes, cookware, and appliances.
Membership break-even calculator
How much must you spend before an annual fee pays off?
Works for any paid membership: annual fee, expected discount rate, and cashback rate produce a monthly spend target.