Windows 10 Calculator is a useful feature with nice design in Windows 10.
However, it may disappear from your machine and you cant find it anywhere.
How can you deal with this situation?

This post will show you some workable methods to fix this issue.
Get these methods fromMiniTool.
However, you could download or reinstall them by running PowerShell with the administrator privilege.
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Step 1: Right-click theStartmenu and clickWindows PowerShell (Admin)to openPowerShellwith the administrator privilege.
Step 2: pop in the commandget-appxpackage Microsoft.WindowsCalculator | remove-appxpackageand then pressEnter.
Step 1: Typecontrol panelin the search bar, clickControl Panelto open it.

Step 2: Choose theView by: Small iconsoption and click theWindows Defender Firewalloption.
Step 3: Click theTurn Windows Defender Firewall on or offoption.
ClickOKto apply the changes.
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Here are solutions to fix it.
Step 1: PressWindows + Rkey to open theRuntool.
Typems-controls:and clickOKto open theSettingswindow.

Step 2: ClickAppsto openApps & features.
Step 3: ClickResetand then confirm all dialogs that will appear and wait for the process to complete.
Check to see if the Windows 10 Calculator not installed error on your gear disappears.

Step 2: Find the keyHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModel\StateChange\PackageListin your registry.
Step 3: Click thePackageListkey and select all registry entries inside it.
Right-tap the selection and chooseDelete.
Confirm all dialogs or prompts that will appear on the screen.
Step 4: reboot your gear manually.
Check to see if the Calculator and other apps appear on your system.
Step 1: Download themedia creation toolfrom the Microsoft website.
Double-tap on the downloaded file MediaCreationTool.exe to fire up the setup.
Step 2: ChooseUpgrade this PC nowand clickNext.
Step 3: Accept the license terms to continue with the installation.
After this process is completed, Windows 10 Calculator should be installed.
if you stumble on this annoying issue, you might try these useful methods mentioned in this post.