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Unit Price Comparison
Compare two product sizes or multipacks using final price, quantity per item and item count. See unit prices and the percentage difference.
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Compare two product sizes or multipacks using final price, quantity per item and item count. See unit prices and the percentage difference.
How it works
Reference unit price = pack price ÷ (quantity per item × item count) × reference quantity. Convert A and B to the same base unit first. For example, enter both in grams and set the reference to 100 for price per 100 g.
Example: 500 g for THB 89 costs THB 17.80 per 100 g; 1,000 g for THB 159 costs THB 15.90 per 100 g. B is about 10.67% cheaper per unit.
This compares price only, not quality, shelf life or how much you will use. Percentage comparison is undefined if A is free. Example prices are not live market quotes.
Frequently asked questions
Can I compare kilograms and grams?
Yes, after conversion: enter 1 kg as 1,000 g so both quantities use grams.
How do I enter buy two, get one free?
Enter the amount actually paid and the total received, including the free item: three items.
Sources
Method last verified 19 Sep 2026