500 g for 3.99 or 1 kg for 6.49
0.798 vs 0.649 per 100 g: the 1 kg pack is the best value, and the small pack costs 23% more per gram.
Unit Price Calculator
Compare products by price per unit to find the best value, with how much more the others cost.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Unit Price Calculator works
Enter the price and quantity of two or three products. Use the same unit for every quantity — grams, milliliters, sheets or items. The calculator divides each price by its quantity, shows the price per unit and per 100 units, and highlights the best value and how much more the others cost.
Formula
unit price = price ÷ quantity
“Costs more” = (unit price ÷ lowest unit price − 1) × 100.
Examples
Mixed units
Comparing 1.5 L with 750 ml? Enter both in milliliters: 1500 and 750.
Frequently asked questions
Is the bigger pack always cheaper?
No. Offers on smaller sizes often beat the large pack, which is why comparing unit prices is worth it.
What if the units are different?
Convert them to the same unit first. The Weight Converter and Volume Converter help with ounces, pounds, grams and liters.
Does the best value mean the best buy?
Only if you'll use it all. A cheaper-per-gram pack that goes off before you finish it can cost more in the end.
Related tools
Discount Calculator
Find the sale price and how much you save from a percentage discount, including stacked extra discounts.
Calculators
Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the percentage change between two values.
Calculators
Weight Converter
Convert kilograms, pounds, ounces, grams, stone and tons, using the exact definition of the pound.
Converters