Unit Price Calculator: Compare Prices per Unit
Compare prices per kilo, per 100 g, per ounce, per litre or per item and find the best value, with multipacks and metric or US units.
What it does
The unit price is the price divided by the quantity: how much you pay per kilo, per litre, per ounce or per item. It is the fair way to compare packs of different sizes, since the bigger pack is not always cheaper. Type each product's price and size, use packs for multipacks such as 6 × 330 ml, and the calculator converts grams, kilos, ounces, pounds, millilitres, litres, fluid ounces and gallons to the same unit.
How to use it
- Type the price, the quantity and the unit of each product (for a multipack, the size of one unit and the number of packs).
- Add more items if you want to compare up to eight.
- See the price per unit of each one, the best value and how much more the others cost.
The arithmetic runs in your browser. Nothing you type is sent anywhere and nothing is stored, so you can use these with real numbers.
Frequently asked questions
How do I calculate the unit price?
Divide the price by the quantity. A 500 g pack for 3.00 costs 6.00 per kilo; a 1 kg pack for 5.50 costs 5.50 per kilo, so the smaller pack is about 9% more expensive.
Is the bigger pack always cheaper?
No. Shops often price large packs or multipacks higher per unit, especially when small sizes are on promotion. Compare the price per unit every time.
How do I compare ounces with grams?
The calculator converts both to the same unit: 1 oz = 28.35 g and 1 lb = 453.6 g. Fluid ounces measure volume (29.57 ml in the US), so compare them with millilitres or litres, not with grams.
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