Unit Price Calculator
Compare pack sizes by price per unit.
Products to compare
Your result
—
Enter your numbers to see the result.
This unit price calculator compares products of different sizes so you can see which is the better deal. Enter the price and size of each pack, in grams, kilograms, ounces, pounds, millilitres, litres, fluid ounces or items, and it converts them to a common unit price, highlights the cheapest and shows how much more each other option costs.
What is a Unit Price Calculator?
Unit price is the cost of a product per standard unit, such as per kilogram, per litre, per ounce or per item. Shelf labels often show it, but sizes are sometimes listed in different units, and online stores may not show it at all.
Comparing unit prices is the simplest way to see whether a larger pack, a multipack or a store brand is really cheaper. This unit price calculator converts every pack to the same unit and ranks them, so you can see the best deal at a glance.
How does the Unit Price Calculator work?
Each pack size is converted to a base unit: grams for weight, millilitres for volume or items for counts. The price is divided by that amount and multiplied up to the unit you choose to display. Packs are then compared with the cheapest, and the difference is shown as a percentage.
How to use the Unit Price Calculator step by step
- Choose your currency.
- Enter each product’s price and size.
- Pick the unit printed on each pack.
- Add more products if needed.
- Choose how to show unit prices.
- Buy the best value you will actually use.
Unit Price Calculator example with real numbers
A store sells the same cereal in three sizes.
| Example input | Value |
|---|---|
| Small box | $3.49 for 340 g |
| Family box | $5.99 for 680 g |
| Bulk bag | $9.99 for 1.36 kg |
| Example output | Value |
|---|---|
| Best value | Bulk bag |
| Cheapest unit price | $7.35 / kg |
| Most expensive unit price | $10.26 / kg (Small box) |
| You save with the best value | 28.4% per kg |
| Products compared | 3 |
The unit price calculator shows the Bulk bag is the best value at $7.35 / kg. The small box costs $10.26 / kg (Small box), so the cheapest option saves 28.4% per kg.
Key features of this Unit Price Calculator
- Weight, volume and count units
- Metric and US units mixed
- Up to 12 products
- Best value and percentage difference
- 8 currencies
Who should use the Unit Price Calculator?
Who is this Unit Price Calculator for?
- Grocery shoppers
- Families on a budget
- Small shop owners
- Students learning ratios
Practical use cases
- Comparing pack sizes in store
- Checking bulk and multipack deals
- Comparing brands
- Pricing products for resale
Key benefits
- Fast: instant ranking.
- Flexible: mixed units.
- Clear: percentage savings.
- Mobile-friendly: use it in the aisle.
Tips for better results
- Check that products are truly comparable, such as the same quality or concentration.
- Use the shelf label’s unit price when it is shown.
- Consider waste: bulk is only cheaper if you use it all.
- Watch for promotions that make a small pack cheaper per unit.
Common mistakes to avoid
- Comparing weight with volume.
- Ignoring ‘per item’ differences in multipacks.
- Forgetting to convert ounces and grams.
- Choosing the cheapest unit price for food that will spoil.
Limitations of this Unit Price Calculator
- It cannot compare weight with volume.
- Quality and brand differences are not considered.
- Taxes and delivery charges are not included unless you add them to the price.
Unit Price Calculator vs other ways to calculate
| Display unit | Best for |
|---|---|
| Per kg or litre | Most grocery items |
| Per 100 g or 100 ml | Small packs, spices, cosmetics |
| Per oz or fl oz | US shelf labels |
| Per item | Eggs, diapers, tablets |
For sale discounts, use the discount calculator. For quick percentages, try the percentage calculator.
Privacy and data handling
This Unit Price Calculator runs entirely in your browser. The numbers you type are not sent to Qorico or stored on any server, and nothing is saved after you close the page. The Copy and Download buttons create the result on your own device. If the page has analytics turned on, it may count that a calculation happened, but it does not record the values you entered.
Unit Price Calculator FAQs
How do I calculate unit price?
Divide the price by the quantity. For example, $5.99 for 680 g is $8.81 per kg.
Is the bigger pack always cheaper?
No. Check the unit price; sometimes smaller packs or promotions are cheaper per unit.
Can I compare grams and ounces?
Yes. The calculator converts both to the same unit.
Can I compare weight and volume?
No. They measure different things, so the calculator skips items with a different unit type.
What unit should I use?
Use the one on the shelf label in your country so you can check against it.
Does it work for any currency?
Yes. Pick from eight currencies.
Related tools
Sources and references
We checked the method and the current figures used in this Unit Price Calculator against these official and primary sources:
- NIST SP 1181: Unit Pricing Guide
- NIST: Metric and US customary units
- USDA: Shopping on a budget
- Department of Consumer Affairs, India
Written and reviewed by the Qorico Team
