Unit Price Comparator
Compare up to 4 products. Find which size / pack gives the best value per unit.
About this calculator
Unit Price Comparator compares up to four products at once and converts every pack into a single unit before it ranks them. Each product row lets you pick the unit it is sold in, such as grams or kilograms, so you do not have to convert anything by hand.
The result table shows each product's cost per unit, how much more it costs than the best option and flags the best value. It is built for shoppers who are standing in an aisle with three different pack sizes.
How to use it
- Choose the Currency and the comparison unit, such as per 100 g.
- For each product enter a name, the price, the quantity and its unit.
- Use + Add Product for up to four products.
- Read the comparison table and the best value.
How products are ranked
Each quantity is converted to the comparison unit, then Cost per unit = Price ÷ Converted quantity. The product with the lowest cost per unit is the best value, and every other product shows (Its cost − Best cost) ÷ Best cost × 100 as its premium.
Worked example
Three packs compared per 100 g
| Brand B, 1 kg, ₹179 | ₹17.90 (best value) |
| Brand A, 500 g, ₹99 | ₹19.80, 10.6% more |
| Brand C, 250 g, ₹55 | ₹22.00, 22.9% more |
The smallest pack costs 23% more per gram than the biggest. That is the usual price of convenience.
Tips and common mistakes
- Use the same comparison unit for every product, such as per 100 g.
- Include loose or open-market prices to see if a branded pack is really cheaper.
- Ignore the pack's marketing size. Read the net quantity on the label.
- Compare after discounts. Enter the price you actually pay.
- Re-run the comparison when prices change. Pack sizes shrink quietly.
Frequently asked questions
What is the best way to compare grocery prices?
Convert every price to a common unit, like per 100 g or per litre.
How many products can I compare?
Up to four.
Does the tool convert units?
Yes. Choose the unit for each product, and it converts to your comparison unit.
Why is the larger pack cheaper per unit?
Packaging and handling costs are spread over more product.
Is the cheapest per unit always best?
Not if it spoils or you do not need that much.
Can I change the currency?
Yes. Choose rupees, dollars, pounds or euros.