Calculators that just work

Yes, completely. There is no account to create, no trial that expires, no feature held back behind a paywall, and no limit on how many calculations you can run. The site costs very little to host because it is plain HTML, CSS and JavaScript with no server doing any work.

No. Every calculation runs inside your own browser and nothing you type is sent anywhere. There are no analytics scripts, no advertising pixels and no cookies. The only things kept are your theme choice, your currency preference and your last ten calculations — all in your browser's local storage, all clearable in one tap.

Yes, once you have visited a page. TrueCalc Pro installs a small service worker that caches the pages you use, so they open again without a connection. You can also install the whole site as an app from your browser's menu, which puts it on your home screen and launches it full screen.

The arithmetic is exact to the limits of double-precision floating point, and every formula is shown on its page so you can check it. Where a calculator gives an estimate rather than a fact — BMI, calorie needs, loan quotes — the page says so plainly and explains the limits. We would rather tell you what a number cannot do than let you over-trust it.

Yes. Every page is built mobile-first, with tap targets large enough for thumbs, number pads that open automatically for numeric fields, and no horizontal scrolling at any width. Results appear as you type, so there is no tiny Calculate button to aim at.

Because it is easier on the eyes for a tool people often open late at night, and the whole design was built around it. If you prefer a light interface, the toggle in the header switches instantly and remembers your choice on this device, so every page you open afterwards stays light until you switch back.

Yes. The Share button on every calculator copies a link with your numbers encoded in it. Whoever opens that link sees the calculator already filled in with your figures and the same result. Nothing is stored on a server — the values travel inside the link itself.

These ten cover the questions people search for most. If something you need regularly is missing, the contact page reaches a real inbox and requests genuinely do shape what gets built next.