Unit Price Calculator
Compare two package sizes to see which is the better value per unit.
Results update as you type.
About this calculator
A unit price calculator divides each item’s price by its size so you can compare different pack sizes fairly and spot the cheaper deal. Enter the price and quantity of two products — in grams, millilitres, sheets or whatever unit you like — and it shows the price per unit for each and which one costs less.
Frequently asked questions
How do I compare prices with different sizes?
Divide each price by its size to get the price per unit (per gram, per sheet, per millilitre), then compare those two figures. A £3.50 pack of 500 g is £0.0070/g while a £5.00 pack of 750 g is £0.0067/g, so the larger pack is slightly cheaper per gram.
Is the bigger pack always cheaper per unit?
Not always. Bulk sizes usually cost less per unit, but promotions, multi-buys and premium large packs can flip that. Comparing the actual unit prices is the only reliable way to tell.
Is the bigger pack always cheaper per unit?
Not always. Bulk sizes usually cost less per unit, but promotions, multi-buys and premium large packs can flip that. Comparing the actual unit prices is the only reliable way to tell.
Results are estimates for general guidance only, not financial, medical or tax advice.