Unit Price Calculator
Divide a price by its quantity to get the price per item, kilogram, litre or any unit, then compare two products to see which costs less per unit.
Runs in your browser. Your data is not uploaded.How our tools work
Both products must use the same unit. Quantities aren’t converted.
Product A
Product B (optional, to compare)
How do I calculate the price per unit?
Divide the price by the quantity to get the unit price: 12 for 6 items is 2 per item. Choose a unit such as kg or litre as a label, enter a second product to compare, and the calculator shows which costs less per unit and by how much. Quantities are never converted between units.
- Choose the unit, such as item, kg or L. Both products must be measured in it.
- Enter the price and quantity of product A. The price per unit is shown below.
- To compare, enter product B. The one with the lower price per unit is marked.
Formulas & Methods
Unit price
Example: 12.99 for 6 items = 2.165 per item
Difference
Example: 2 vs 2.50 per kg: product A is 20% less per kg
Key features
Price per anything
Per item, kg, g, lb, oz, L, mL, metre, sheet or roll.
Compare two products
See both unit prices and which one is lower, by what percentage.
Small prices shown clearly
Prices per unit keep up to four decimals, so 0.0123 per sheet isn’t rounded to 0.01 and 2.165 per can isn’t rounded to 2.17.
Example: 30 or 90 dishwasher tablets?
A box of 30 tablets costs 5.50 and a box of 90 costs 14.00. With the unit set to item, enter 5.50 and 30 for product A, and 14.00 and 90 for product B. The small box works out at 0.1833 per tablet and the large one at 0.1556, so the large box costs 15.2% less per tablet: about 2.50 saved over 90 tablets.
When the lower unit price isn’t the better buy
A lower price per unit only saves money on what you use. A 2 L bottle of milk at 2.40 is 1.20 per litre and a 1 L bottle at 1.45 is 1.45 per litre, but if half of the big bottle goes off, you have paid 2.40 for the litre you drank. The same applies to anything that goes stale, expires or that you are only trying out.
Offers work the other way too: a multi-buy or a sale on the small pack can make it the cheaper one per unit, so compare the prices you would pay at the till, not the shelf prices.
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Frequently Asked Questions
How do I compare a 500 g and a 1 kg pack?
Enter both in the same unit, because the calculator doesn’t convert between units: 0.5 and 1 with the unit set to kg, or 500 and 1000 with g. At 3.49 for 500 g and 6.29 for 1 kg, that is 6.98 and 6.29 per kg.
Can I include a discount?
Enter the price you actually pay. Use the discount calculator first to find a sale price.
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