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- Check the Calculator mode to ensure you're using the correct one—Standard mode calculates left-to-right (e.g., 2 3 × 4 = 20), while Scientific mode follows order of operations (e.g., 2 3 × 4 = 14), which explains most "wrong answer" issues. 2. Restart the Calculator app by closing it via Task Manager (Ctrl Shift Esc, end task) and reopening it to resolve temporary glitches. 3. Repair or reset the app through Settings > Apps > Apps & features > Microsoft Windows Calculator > Advanced options > Repair; if unresolved, use Reset to clear corrupted data (note: history will be lost). 4. Reinstall Calculator via PowerShell by running, as admin, Get-AppxPackage windowscalculator | Remove-AppxPackage followed by the reinstall command to restore the app. 5. Check for Windows Updates via Settings > Update & Security > Windows Update to install fixes that may resolve app issues, and test input using mouse clicks to rule out keyboard input errors; if problems persist, use a web-based alternative temporarily. Most issues stem from mode confusion, and nearly all can be fixed through mode adjustment, repair, or system updates.
If the Windows 10 Calculator is giving wrong answers or not working correctly, it’s usually due to a glitch in the app, incorrect mode settings, or corrupted app data. Here’s how to fix it:

1. Check the Calculator Mode
The most common reason for "wrong" answers is using the wrong mode:
- Open Calculator.
- Click the ? (Menu) button in the top-left.
- Make sure you're in the correct mode:
- Standard – Basic math (addition, subtraction, etc.)
- Scientific – Advanced functions (sin, cos, exponents)
- Programmer – Binary, hex, bit operations (may give unexpected results if used by mistake)
- Date calculation / Converter – Not for arithmetic
? For example, typing 2 3 × 4
in Standard mode gives 20
(left-to-right), but in Scientific mode, it follows order of operations and gives 14
. This isn’t a bug — it’s by design.

2. Restart the Calculator App
Sometimes the app just needs a restart:
- Close Calculator completely.
- Press
Ctrl Shift Esc
to open Task Manager. - Find Calculator under "Processes".
- Right-click and select End task.
- Reopen Calculator from the Start menu.
3. Reset or Repair the Calculator App
If it’s still acting up, reset the app:

- Press
Win I
to open Settings. - Go to Apps > Apps & features.
- Search for Calculator.
- Click on Microsoft Windows Calculator, then click Advanced options.
- Scroll down and click Repair.
- If that doesn’t work, try Reset (this clears app data like history).
?? Reset will clear your calculation history, but it’s safe.
4. Reinstall Calculator via PowerShell
If repair doesn’t help, reinstall it:
- Right-click Start and select Windows PowerShell (Admin).
- Run this command to remove Calculator:
Get-AppxPackage *windowscalculator* | Remove-AppxPackage
- Then reinstall it:
Get-AppxPackage -allusers Microsoft.WindowsCalculator | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
This reinstalls the default Calculator app.
5. Check for Windows Updates
Microsoft often fixes bugs through updates:
- Go to Settings > Update & Security > Windows Update.
- Click Check for updates.
- Install any pending updates — they may include fixes for built-in apps.
Also, make sure you’re not using a third-party keyboard or input method that might be sending incorrect characters. Try typing with the mouse buttons in Calculator to test.
If none of the above works, consider temporarily using a web-based calculator (like Google’s) while troubleshooting.
Basically, 90% of "wrong answers" are due to mode differences — especially order of operations in Standard vs Scientific mode. The rest can usually be fixed with a repair or reinstall.
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