Unit Price Comparator
Compare the unit price of two products to find which offers the best value for money. Enter the price, size, and unit for each product.
The calculator normalizes both products to the same base unit and shows the price per unit, highlighting the better deal and the percentage you save by choosing it.
How it works
Unit Price = Total Price / Quantity in Base Units
Use cases
- Comparing grocery items of different sizes (e.g., 500g vs 1kg)
- Finding the best deal between brand-name and generic products
- Evaluating bulk vs individual packaging
- Comparing liquid products sold in different volume units
Frequently asked questions
How do you calculate the unit price of a product?
Divide the total price by the quantity in a common base unit. For example, a 750 g package costing $6.00 works out to $8.00 per kilogram (6.00 ÷ 0.75). Doing this for both products puts them on the same scale so you can compare them directly.
How do I compare products sold in different units, like grams and kilograms?
Convert both quantities to the same base unit before dividing. A 500 g pack and a 1.2 kg pack should both be expressed in kilograms (0.5 kg and 1.2 kg), then each price is divided by its quantity. This calculator does that normalization automatically for weight, volume, and count units.
Is the bigger package always cheaper per unit?
No. Larger sizes are often better value, but promotions on small sizes, shrinkflation, or premium 'family size' pricing can reverse that. Always check the price per unit rather than assuming — and only buy the bulk size if you will actually use it before it expires.
What does the savings percentage mean in a unit price comparison?
It shows how much cheaper the better option is per unit, relative to the more expensive one. For example, if product A costs $8.00/kg and product B costs $10.00/kg, choosing A saves 20% per unit. It reflects the per-unit difference, not the difference in total package price.
Why do supermarket shelf labels show price per 100 g or per liter?
Many countries require shelf labels to display a standardized unit price precisely so shoppers can compare products of different sizes at a glance. It is the same calculation this tool performs — total price divided by quantity — just expressed per 100 g, per kilogram, or per liter depending on local rules.