Unit price comparison calculator
Work out which product is the best value when shops sell the same thing in different pack sizes. Enter the price and quantity of each option, choose the unit, and the calculator shows the true price per unit — per 100 g, per litre or per item — with the cheapest option highlighted.
Supported units include grams, kilograms, ounces and pounds for weight; millilitres, litres, US fluid ounces and US gallons for volume; and a simple “each” for counted items. Because a gram is not the same as a millilitre, the tool only compares items measured the same way and flags the best value within each group.
It is privacy-first: all the arithmetic runs in your browser and your prices never leave your device.