Unit price finds the real cheapest option when pack sizes differ — enter each product's price and size, and it works out the price per kilogram, per litre or per item and marks the best value. Great at the supermarket. Nothing is uploaded.

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Enter the shelf price and the pack size for each product; the calculator normalises everything to one base unit so you can compare fairly. Weights convert through grams/kilograms (and ounces/pounds), volumes through millilitres/litres (and fluid ounces/gallons). The best value is highlighted; others show how much more they cost per unit. Everything runs on your device.