Unit Price Comparison
Compare price per 100g, per litre or per item to find which product is actually the cheapest. Instant, exact best-buy maths right at the shelf.
Which one is actually cheaper? 🛒
Enter the price and pack size of two or more products below — we'll normalise them to the same unit so you can see the real winner.
🔒 100% private & instant — every calculation runs in your browser, nothing is sent anywhere. Conversions use exact factors (1 lb = 453.59237 g, 1 US fl oz = 29.5735… ml). Built for the supermarket shelf — works great on your phone.
Why you’ll love Unit Price Comparison
Instant & free
No signup, no paywall, no limits — Unit Price Comparison works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Accurate & clear
Built on the real formulas, with a breakdown you can actually trust.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Unit Price Comparison
When you're standing at the shelf comparing two similar products at different prices and package sizes, unit price comparison is the only way to know which is actually cheaper. This cost comparison calculator instantly works out price per 100g, price per kg, price per litre, or price per item—whatever units matter for what you're buying. Just enter the product name, price, and package size, and you get the exact unit price in seconds.
Price per unit matters because a larger package often costs less per item, but not always by the amount the shelf price suggests. The unit price calculator removes the guesswork by showing you what you're really paying for each 100g, each litre, or each individual item. This is especially useful for groceries, where package sizes vary wildly and the cheapest-looking product at the till might actually cost more per kilo than the alternative.
Use this best buy calculator in the shop, at home while meal planning, or when comparing online prices. It runs entirely in your browser, calculates instantly with no signup required, and your data never leaves your device. Whether you're comparing bulk buying options, deciding between brands, or finding which size pack gives the best value, unit price comparison gives you the exact figures you need to make the right choice.
Popular uses
Frequently asked questions
Shelf price alone doesn't tell you the actual cost of what you're buying. A larger package with a higher total price might cost less per 100g or per item than a smaller, cheaper-looking package. Unit price comparison shows the true cost per unit, so you always know which product gives better value.
You can compare any unit that makes sense for your product: price per 100g, per kilogram, per litre, per ounce, per gallon, per item, or any custom unit you define. The cost comparison calculator is flexible so it works for groceries, household products, or anything with a measurable quantity.
The calculator performs exact arithmetic based on the figures you enter, so it's only as accurate as your input. Double-check that you've entered the correct price and correct package size from the product label, and your unit price will be exact. The math is instant and always precise.
It's most useful when comparing similar products in different sizes or brands, deciding whether bulk buying is worth it, or spotting which product gives the best value in a crowded shelf. It's especially helpful in grocery shopping, where packages sizes vary widely and the cheapest option isn't always the best buy.
Unit Price Comparison is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
It uses the standard formulas and shows its working, so you can verify every number. For big decisions, treat the result as a reliable estimate.
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