Unit Price Calculator
The shelf price lies by omission: the 900 ml bottle at $3.40 versus the 1.5 L jug at $5.10 — which is cheaper per drink? Enter price and quantity for each pack, and the calculator computes the unit price of both and names the winner instantly.
Bulk is usually cheaper per unit — but not always, and supermarkets know shoppers assume it is. Ten seconds with this calculator pays for itself the first time it catches a 'family size' that costs more per gram than the regular box.
How to use
- Enter pack A's price and quantity, then pack B's.
- Read both unit prices — the cheaper one is highlighted automatically.
- Use any quantity unit you like (grams, ml, sheets, tablets); just use the same unit for both packs.
Frequently asked questions
How do I calculate unit price?
Divide the price by the quantity: $3.40 for 900 ml is 3.40 ÷ 900 = $0.00378 per ml (or 37.8 cents per 100 ml). Do the same for the other pack and compare — the calculator does both divisions at once.
Is bigger always cheaper per unit?
Usually, but not always. Discount lines sometimes cost more per gram than the standard size, and sale prices can invert the rule. That is exactly why shelf tags saying 'value size' deserve a quick unit-price check.
What unit should I compare in?
Any unit, as long as both packs use the same one. Per 100 g or per liter reads most naturally; for paper goods, per sheet or per 100 sheets is the honest comparison.
Does it work for three or more packs?
Compare in pairs — A against B, then the winner against C. Two rounds settle a three-way comparison.