About Calcugator
Calcugator is a free, growing collection of calculators, converters, generators, and other tools for everyday life, health, home projects, finance, school, and more. Every one of them runs entirely in your browser, so nothing you type here ever touches a server.
Why it's built this way
A calculator is just arithmetic -- there's no real reason a birth date, a bill total, or a mortgage rate needs to leave your device to get an answer. Every tool on this site does its math with plain JavaScript, right in the tab you're already looking at, the same way a physical calculator doesn't need to phone anyone to add two numbers. You can check this yourself: open your browser's dev tools, switch to the Network tab, and use any calculator here. No request will fire.
Currency Converter is the one exception. Exchange rates change daily and can't be computed from nothing, so that tool makes a single request on page load to fetch that day's public rates -- after that, every conversion you make is calculated locally from the cached numbers, with no further requests per keystroke. It's the only network call anywhere on this site; see the Privacy Policy's "Exchange rates" section for exactly what that request does and doesn't send.
Credits
Every tool is hand-written HTML, CSS, and JavaScript, with no framework and no analytics script. The one piece of outside code this site uses at all is IBM Plex Mono (SIL Open Font License) for the typeface, self-hosted rather than loaded from a font service. Even the more unusual tools -- the QR Code Generator's encoder, Image Compressor's PNG quantizer -- are original, hand-written implementations rather than a borrowed library.
The mascot, Alger the alligator, was drawn by Mindy, Calcugator's creator :-)
Why so few dependencies
Fewer dependencies means fewer things to break, fewer things to track you, and a site that stays fast and keeps working the same way years from now.