Free tool
Unit price calculator
Which size is actually cheaper? Compare cost per unit, not just the shelf price.
Option A
Option B
Cost per unit
A: 0.012 · B: 0.0106
Enter the price and quantity (use the same unit for both options — grams, ml, items or uses). The cheaper unit price wins on value; just check you will use the larger pack in time.
For long-life products, our cost-per-use calculator spreads the price across years of use.
Common questions
How do I compare prices fairly?
Convert both options to the same unit — per 100 g, per litre, per item or per use — then compare. The bigger number on the shelf is not always the better value once quantities differ.
Price per unit or total price?
Both matter. Unit price shows value, but a larger pack only saves money if you will actually use it before it expires or wears out. Factor in storage and waste.