Unit Price Calculator
Compare unit prices of products to find the best value for money. Compare price per kg, litre, or unit.
About this calculator
The bigger pack is not always the better buy. The Unit Price Calculator compares two or more products by price per kilogram, litre, gram, millilitre or piece, so that you can see which one costs less for the same quantity.
Enter the price and quantity for each product, choose the unit you want to compare in, and the tool ranks them and marks the best value. It is useful for groceries, household supplies, pet food and anything sold in different pack sizes.
How to use it
- Enter a name, a price and a quantity for Product 1 and Product 2.
- Use + Add Product to compare more.
- Choose the Unit to compare in.
- Press Compare Prices to see the cost per unit and the best buy.
Unit price formula
Unit price = Price ÷ Quantity. Convert all quantities to the same unit first, such as grams to kilograms. The best value is the lowest unit price. The difference between two products is (Higher − Lower) ÷ Lower × 100.
Worked example
Rice: 5 kg for ₹450 against 10 kg for ₹820
| 5 kg bag | ₹90 per kg |
| 10 kg bag | ₹82 per kg |
| Saving with the larger bag | 8.9% |
The larger bag saves ₹8 per kg. It is only worth it if you will use all of it before it goes stale.
Tips and common mistakes
- Compare in the same unit. A 500 g pack and a 1 kg pack must both be converted to kilograms.
- Check the net weight, not the pack size. Some packs are smaller than they look.
- The cheapest unit price is not the best buy if some of it goes to waste.
- Watch for offers such as buy one get one, which lower the unit price. Enter the total quantity you get.
- Compare store brands and branded products on the same basis.
Frequently asked questions
What is unit price?
The price of one standard unit of a product, such as per kilogram or per litre.
How do I compare unit prices?
Divide each price by its quantity in the same unit and pick the lowest.
Are bulk packs always cheaper?
Usually, but not always. Check the unit price and whether you will use it all.
Can I compare products in different units?
Convert them to the same unit first. This tool compares in the unit you choose.
Does it work for non-food items?
Yes, any product sold by weight, volume or count.
How many products can I compare?
As many as you add with + Add Product.