Second package (optional)
Use the same currency and quantity unit for both packages. For 500 g and 750 g, enter 500 and 750; the result is the price per gram.
Result
Price Per Unit Calculator: Compare Two Packages
Divide the total price by the quantity. Add a second package to compare the cost per item, kilogram, litre or another shared quantity unit.
Compare prices for the same usable quantity, rather than choosing by package price alone. Use matching quantity units and one currency for both packages.
Formula: Unit price = package price ÷ quantity. Percentage saving = difference in unit prices ÷ higher unit price × 100.
Example: Package A: 9.60 ÷ 12 = 0.80 per item. Package B: 12.60 ÷ 18 = 0.70. B is 12.5% cheaper per item, although its package price is higher.
Quantity must exceed zero. Price can be zero. A lower unit price is not always better if the extra quantity will go unused.
Go to calculatorMethod, examples and limits
Put both quantities on the same basis
For a 500 g bag costing 4.00 and a 750 g bag costing 5.25, enter 500 and 750 to obtain prices per gram: 0.008 and 0.007. Alternatively enter 0.5 and 0.75 to compare per kilogram: 8.00 and 7.00. Comparing 500 against 0.75 would mix grams with kilograms and invalidate the result.
Include the amount actually paid
Use the full price of the quantity you are comparing. Apply a coupon before entering the price and include unavoidable delivery fees or taxes consistently. For a three-pack offer, enter the total offer price and the total quantity across all three packs, rather than combining an offer price with a single-pack quantity.
Understand the saving percentage
For unit prices of 0.80 and 0.70, the difference is 0.10. Relative to the higher price, 0.10 ÷ 0.80 × 100 = 12.5%. The reverse question uses a different denominator: 0.80 is about 14.29% above 0.70. A percentage decrease and the reverse increase need not be identical.
Check value beyond the arithmetic
Only compare products that are suitable substitutes. Concentration, quality, edible portion, durability and waste can change the usable quantity. A large package with a lower unit price may exceed your budget or expire before you can use it. The tool compares quantities, not product quality or personal value.
Read small results carefully
The result retains additional decimal places for small unit prices. Converting grams to kilograms can make the comparison easier to read. Equal unit prices are shown as a tie; neither package has a numerical saving. Both optional package B fields must be supplied together.
Maintained by: Muhammad Bhutto · Updated: 2026-10-16. Checking methodology · Report an error