What is calc.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the calc.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Calc.exe file information

Windows Task Manager with calc
Calc.exe process in Windows Task Manager

The process known as Windows Calculator application file or Windows Calculator belongs to software Microsoft Windows Operating System by Microsoft (

Description: The original calc.exe is an important part of Windows and rarely causes problems. The calc.exe file is located in the C:\Windows\System32 folder. Known file sizes on Windows 8/7/XP are 114,688 bytes (86% of all occurrences) or 776,192 bytes. 
The calc.exe file is a trustworthy file from Microsoft. Calc.exe is able to connect to the Internet, monitor applications, hide itself, record keyboard and mouse inputs and manipulate other programs. Therefore the technical security rating is 7% dangerous; however you should also read the user reviews.

Recommended: Identify calc.exe related errors

If calc.exe is located in a subfolder of C:\Windows, the security rating is 1% dangerous. The file size is 776,192 bytes (75% of all occurrences), 816,128 bytes or 798,720 bytes. The calc.exe file is a Windows system file. Calc.exe is a Microsoft signed file. The program has no visible window.

Important: Some malware disguises itself as calc.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the calc.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Windows Calculator
not dangerous at all, windows calc.
I agree windows does have it but there's also a virus with the same name.
;D calc.exe ist ein Taschenrechner, den es schon ewig in Windows gibt, kein Virus, keine Gefahr für die Registry
Kein Problem, keine Gefahr für Windows, nur der Taschenrechner

Summary: Average user rating of calc.exe: based on 5 votes with 5 user comments. 2 users think calc.exe is essential for Windows or an installed application. 2 users think it's probably harmless. One user suspects danger.

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Best practices for resolving calc issues

A clean and tidy computer is the key requirement for avoiding problems with calc. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the calc.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

calc.exe [all]