Compare prices by unit price
The bigger package isn't always cheaper. The small print on the shelf tag tells you.
- Find the unit price on the shelf tag: the price per ounce, per count or per 100 g.
- Compare that number, not the package price.
- No tag? Divide the price by the amount: $4.80 ÷ 16 oz = 30¢ an ounce.
- Check that both tags use the same unit. Stores sometimes show one per ounce and another per pound.
Try it now: On your next shop, check one item where the "family size" costs more per unit.