Unit Price Calculator
This unit price calculator compares two products by reducing each one to its price per unit, so you can tell at a glance which is genuinely cheaper. Supermarkets sell the same product in many pack sizes and formats, and a bigger box is not always the better deal. Enter the price and the quantity of each option — in kilograms, litres, grams, millilitres, or number of items — and the calculator divides one by the other to reveal the true cost of a single unit for both products, along with a clear verdict on which one wins.
Product A
Product B
Better value
Price per unit
Price per unit
The price per unit is obtained by dividing the total price by the quantity, using the same unit of measure for both products. The lower figure marks the better value.
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How it works
The calculator uses a single, simple operation: unit price = total price ÷ quantity. It does this for both products and then compares the two results. Because both figures use the same unit of measure, they are directly comparable no matter how the packages are sized. For example, a 2 kg bag costing 10 works out to 5 per kg, while a 3 kg bag costing 14 works out to about 4.67 per kg — so the second bag is the better value even though it costs more in absolute terms. Whichever product has the lower price per unit is highlighted as the more convenient choice; if both come out identical, the calculator reports a tie.
Example: comparing two pack sizes
Imagine the same product comes in a 500 g pack at 1.50 and a 1 kg pack at 2.80. At first glance the small one looks cheaper because it costs less, but converting to price per kilo changes the picture: the 500 g works out to 3.00 per kg and the 1 kg to 2.80 per kg. The large pack wins, even though its total price is higher.
| Pack size | Price | Price per kg |
|---|---|---|
| 500 g | 1.50 | 3.00 |
| 1 kg | 2.80 | 2.80 |
The bigger pack is not always cheaper
The instinct that "bigger is always better value" often fails. Promotions on the small size, premium formats, multi-packs, or simply pricing strategy sometimes make the small pack have the lower price per unit. The only way to be sure is to normalize: bring everything to a common reference — price per 100 g, per liter, or per item — and compare that figure. Many shelf labels already show the unit price precisely for this; when it is missing, this calculator solves it in a second.
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Preguntas frecuentes
- What is the price per unit?
- The price per unit is how much a single unit of measure — one kilogram, one litre, one item — costs. It is found by dividing the total price of a product by its quantity. Reducing every option to this common figure lets you compare products fairly, even when they come in different pack sizes.
- How do I compare two products of different sizes?
- Enter the price and the quantity of each product using the same unit of measure for both. The calculator divides each price by its quantity to give the price per unit, then tells you which one is lower. The product with the lower price per unit is the better value, regardless of which one has the bigger total price.
- Is the bigger package always cheaper?
- No. Larger packages often have a lower price per unit, but not always — promotions, premium formats, and packaging can make a smaller size cheaper per unit. That is exactly why comparing the unit price matters: it removes the size difference and shows the true cost.
- What units can I use?
- Any unit works, as long as you use the same one for both products: kilograms, grams, litres, millilitres, metres, or a simple count of items. The calculator just divides price by quantity, so the unit is whatever you decide the quantity represents.
- What if both products have the same price per unit?
- If the two unit prices come out identical, the calculator reports a tie. In that case neither option is cheaper per unit, so you can choose based on other factors such as brand, quality, quantity you actually need, or how quickly you will use it.