How to compare unit prices
Unit price = price ÷ size (in the same unit)
Example
Rice at 3.50 for 500 g is 7.00 per kg. A 1 kg bag at 5.80 is 5.80 per kg, so the big bag is 17% cheaper.
Splitting a bill instead? Try the bill splitter, or work out a sale price with the discount calculator.