How do I compare prices by unit?

Divide each price by its quantity to get price per unit, then compare. $3.50 for 500 g is $0.007/g; $6 for 1000 g is $0.006/g — B is cheaper per gram.

Why use the same unit?

Only compare price per gram with price per gram (or per ml, per item). Mixing units gives a meaningless comparison.

Unit Price Comparison Calculator

Free unit price calculator. Enter the price and quantity of two products to compare their price per unit and see how much cheaper the better-value option is. Perfect for smart grocery shopping.

Compare two products by price per unit to find the better value.

unit price = \frac{price}{quantity}

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