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* In older versions of the calculator{{Which|date=May 2024}}, some [[transcendental function]] operations, such as the [[square root]] operator (<code>sqrt(4) − 2 = −8.1648465955514287168521180122928e−39</code>), would be calculated incorrectly due to [[catastrophic cancelation]].<ref>{{Cite web|title=Microsoft Fixes Decade-Old Windows Calculator Square Root Bug|url=https://news.softpedia.com/news/microsoft-fixes-decade-old-windows-calculator-square-root-bug-520559.shtml|access-date=2023-04-15|website=news.softpedia.com|date=5 April 2018 |language=en-US}}</ref> In newer versions, this doesn't happen with integers, but it still happens when you enter decimal numbers.
* Older versions of the universal Calculator in [[Windows 10 editions#Release branches|non-LTSC editions]] of [[Windows 10]] doesn't use any regional format (can be set in Region Control Panel) that are different from the app's display language for number formatting (the app's language is English (United States) but Windows's regional format is set to a different format).<ref>{{Cite web|title=Wrong usage of Regional settings in Windows 10 Apps: weather, calculator|url=https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings-winpc/wrong-usage-of-regional-settings-in-windows-10/25db7ff1-aef5-4f3a-b958-21d843b04a74|access-date=2021-01-24|website=answers.microsoft.com|language=en-US}}</ref>
==Calculator Plus==
Calculator Plus is a separate application for [[Windows XP]] and [[Windows Server 2003]] users that adds a 'Conversion' mode over the Windows XP version of the Calculator. The 'Conversion' mode supports [[unit conversion]] and [[currency conversion]]. Currency exchange rates can be updated using the built-in update feature, which downloads exchange rates from the [[European Central Bank]].<ref>{{cite web |title=Microsoft Calculator Plus |url=https://www.tek.no/nyheter/nyhet/i/P9qax0/microsoft-calculator-plus |website=Tek.no |language=no |date=13 September 2004}}</ref><ref>{{cite web |title=Use this great maths tool for cheats! - 9Finance |url=https://finance.nine.com.au/small-business/use-this-great-maths-tool-for-cheats/cc31189d-a316-4f8a-87ce-f05a37887f65 |website=finance.nine.com.au|date=June 2024 }}</ref>
==See also==
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