Terms of Use

The calculator, the guides and the embeddable widget are free for personal use. You don't need an account. Please don't misuse the site — for example by trying to overload it, break it or scrape it in bulk.

The calculator does exactly the math shown on the page, using standard conversion factors (listed on the About page). But the result is only as good as the numbers you enter, and labels in stores can be wrong or out of date. The site is provided "as is", without any warranty. Check anything important before you rely on it.

The guides explain how to compare prices. They are general information, not financial, nutritional or medical advice. A lower price per unit isn't always the right choice — quality, needs and how much you will actually use matter too. For baby formula and pet food in particular, follow the advice of your pediatrician or vet.

Average prices shown on this site are official statistics from national statistics offices, for information only — they are not offers, quotes or guaranteed prices at any store. See the methodology for sources and caveats.

Prices, sizes and product names you type are processed in your browser. When you share a result, the link contains those values — only share links you are happy for others to see. Details are in the Privacy Policy.

You may embed the calculator on your own website using the code from the embed page. Please keep the credit link under the widget and don't present the calculator as your own work. We may change or stop the widget at any time.

The site shows ads from Google AdSense. We don't choose individual ads and don't endorse the products in them. Links to other websites are provided for convenience; we are not responsible for their content.

The text, guides and design of the site belong to Michał Białas. You are welcome to quote short parts with a link back to the page. Please don't copy whole pages.

These terms may be updated from time to time; the date at the top shows the latest version. Questions? Get in touch.