WHAT THIS TOOL DOES
This unit price calculator compares products by price per unit, so you can see which option is the best buy.
Use it for supermarket packs, bulk deals, refills, bottles, tins, bags, multipacks and household supplies.
Enter all quantities in the same unit, such as grams, millilitres or items.
HOW TO USE IT
Page 1 sets the comparison scale and Option A.
Page 2 enters Options B and C. Press SOLVE to move to the results page.
Leave any unused option at quantity zero.
UNIT PRICE FORMULA
Unit price = price ÷ quantity.
To compare per 100 units, multiply the unit price by 100.
To compare per 1000 units, multiply the unit price by 1000.
The lowest unit price is the cheapest option.
WORKED EXAMPLE
Option A: £1.20 for 300g.
£1.20 ÷ 300 = £0.004 per g.
Per 100g: £0.004 × 100 = £0.40.
Repeat for each option. The lowest cost per 100g wins.
WHO USES IT
Shoppers use it to compare offers where sticker prices and pack sizes are different.
It helps compare groceries, detergents, pet food, refill packs, online listings and bulk-buy deals.
It is also useful for teaching proportion, rates and value-for-money calculations.
COMMON SEARCHES
unit price calculator, price per 100g calculator, price per ml calculator, best buy calculator, compare pack sizes.
Other searches include cheapest per kg, compare bottle sizes, price per item and supermarket value comparison.
Use the same quantity unit for each option before comparing.
RELATED TOOLS
This page belongs to the utility calculators section.
Use the related pages for fuel cost, recipe scaling and broader calculator navigation.