Is the big box really cheaper? Enter the price and size of each package, straight from the label, and the calculator works out the price per ounce for each one and shows which is the better deal and by how much. For a multipack, enter the size of one can or roll and how many come in the pack. Compare up to six items, mix ounces, pounds and grams freely, and switch the result to price per pound, per 100 g or per item. Weight and volume can’t be compared directly, so use fl oz for drinks.

Price and size from the label. For a 12-pack of 12 fl oz cans, enter 12 fl oz and pack of 12. Names are optional.
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Check the size on the label — shelf tags sometimes use different units for similar items. A bigger pack only saves money if you use it up before it goes bad.

How it works: unit price = price ÷ (size × pack count). Sizes are converted to the same unit first (1 lb = 16 oz, 1 oz = 28.35 g, 1 fl oz = 29.57 ml, 1 gal = 128 fl oz), so a 1 lb bag and a 500 g bag compare fairly. The percentage next to each item is how much more it costs per unit than the best value, and the savings line is what the best value saves over the next best for the same amount. Ounces (oz) measure weight and fluid ounces (fl oz) measure volume, so the two can’t be mixed.