@nprofile1q... @nprofile1q... As I've said elsewhere today:
There are strict legal limits on where you can limit liability. Your calculator can't have that disclaimer at all because (in both the EU and USA) there are very strict limits on disclaimers of liability for physical machines (which is an issue that comes up in open-source hardware quite often).
Even in software, claiming in your marketing that your product does one thing and then having a disclaimer in the license that says that it does not, in fact, do that thing is generally a problem: you may not be liable for the damages from failing to do the thing, but there's a good chance that you're liable for fraud. A disclaimer of liability isn't a get out of jail free card, it's a statement of intent.