The practical questions people actually ask, answered plainly.
How accurate are the conversions?
Every physical-unit conversion factor is an exact, internationally defined ratio (an inch is exactly 25.4mm, for example), not a rounded approximation. Every factor is checked by an automated test that runs on every change to the site.
Why doesn't this convert currency?
Currency exchange rates change constantly and require a live network connection, which conflicts with the rest of the site's design: everything else here is a fixed, permanent ratio that works offline. Currency may be added later, but as a clearly separate, clearly-labeled feature, not folded into the same "exact and offline" promise the rest of the site makes.
Is my data collected when I use the converter?
The conversion logic itself runs entirely in your browser and sends nothing anywhere. Your recent conversions are kept in memory for the current tab only and disappear when you close or reload the page. The page around it may use advertising cookies once you accept them; see the Privacy Policy for details.
Why does it sometimes show several answers for one conversion?
Some everyday words are genuinely ambiguous. "Cup", "gallon", and "ton" mean different amounts in different countries. Rather than silently picking one and guessing, the site shows every common reading side by side and lets you pick.
Does it work offline?
The converter itself, yes: the full unit table ships with the page, so once it's loaded it keeps working with no connection at all. The separate guide and reference-chart pages are ordinary web pages and do need a connection to load.
How is "sense of scale" calculated?
Certain conversions are compared against a curated list of real-world reference points (a marathon, a Big Mac, the height of a well-known landmark) chosen to be close in magnitude to the result. Every reference figure is independently fact-checked, not generated on the fly.
How accurate are the cooking (cup-to-grams) conversions?
They use published ingredient-density figures (from King Arthur Baking's reference chart, for the ingredients it covers) rather than treating every ingredient as water. That said, how firmly you pack flour or sugar can shift the real weight by ten percent or more, so treat these as a strong starting point, not a substitute for a kitchen scale when precision really matters.
Is this free?
Yes, with no account required. The site carries ads, served by Google AdSense once you accept the cookie prompt, to help cover hosting costs; you can reject them and still use the converter.
I think a number is wrong. What do I do?
Please get in touch through the contact details on the About page. Every figure on this site is meant to be independently verifiable, and a wrong one is treated as a bug, not a footnote.