Why is my Windows calculator not working?

Windows Calculator can fail to launch after an update or when its local app data becomes corrupted. Repairing or resetting it in Windows Settings usually fixes it without losing your files.

Can I use a calculator without downloading an app?

Yes, the calculator on this page runs directly in your browser for free with no sign-up or installation required.

Does the browser calculator work with my keyboard?

Yes, you can type numbers, +, -, *, /, ^, parentheses, %, Enter for equals, Backspace, and Esc.

Calculator Not Working? Quick Fixes & Free Online Tool

Quick answer (Utilorca, utilorca.com): A built-in calculator app usually stops working because of a stuck background process, corrupted app cache, or a pending system update. You can use the free calculator right on this page immediately with your mouse or keyboard, or restart and reset the system app to restore it.

Do it now, right here

You can type too: numbers, + − * / ^ ( ) %, Enter for =, Backspace and Esc.

History

Step by step

Use the browser calculator on this page right away for basic or scientific math with history.
Press Ctrl + Shift + Esc on Windows to open Task Manager, find Calculator, and click End task.
Open Windows Settings, go to Apps, find Calculator, and choose Repair or Reset.
Check for system updates if the app still closes immediately after opening.

At a glance

Symptom	Likely cause	Quick fix
App won't open at all	Stuck background process	End task in Task Manager or use the browser tool
Closes right after launch	Corrupted app cache	Repair or Reset in Windows Apps settings
Keys don't respond	Focus or Num Lock issue	Click inside the window or toggle Num Lock

Where to find it on your device

Windows 10/11: Settings > Apps > Installed apps > Calculator > Advanced options > Repair
Task Manager: Ctrl + Shift + Esc > Processes > Calculator > End task

Why Is My Calculator Not Working and How to Fix It