The quickest way to see your PC uptime

The fastest way to see how long your PC has been running is to open the Task Manager and look at the Performance tab. Press Ctrl + Shift + Esc on your keyboard to open Task Manager directly. Click the Performance tab at the top, then click CPU in the left sidebar. At the bottom right of the window, you will see "Up time:" followed by a number of days, hours, minutes, and seconds.

This number tells you exactly how long your computer has been powered on since the last restart. If your PC shows "Up time: 5 days, 3 hours, 22 minutes, 15 seconds," that means it has been running continuously for that entire period without shutting down or restarting.

Task Manager is built into Windows and requires no extra software to use. This method works on Windows 10 and Windows 11.

Key Takeaways

  • Press Ctrl + Shift + Esc to open Task Manager, then go to the Performance tab and click CPU to see your uptime at the bottom right.
  • The uptime number shows how long your PC has been running since the last restart or power-on.
  • You can also find uptime using the System Information window by pressing Windows key + Pause/Break, or by typing "msinfo32" in the search box.
  • The Command Prompt method using "systeminfo" gives you uptime along with other technical details about your computer.
  • Restarting your PC clears the uptime counter back to zero.

Using System Information to check uptime

System Information is another built-in Windows tool that shows your uptime. Press the Windows key + Pause/Break on your keyboard to open the System window. This opens a panel showing basic information about your PC. Look for a link that says System Protection or Advanced system settings on the left side, then click System Protection if it appears.

Alternatively, you can search for "msinfo32" in the Windows search box and open the System Information window directly. Once it opens, look at the right panel for a line labeled System Boot Time. This shows the exact date and time your computer last started. You can calculate the uptime by subtracting that time from the current time, though this method is less convenient than Task Manager because it does not show the uptime as a single number.

Checking uptime through Command Prompt

If you prefer using the command line, you can see your uptime in Command Prompt. Press Windows key + R to open the Run dialog, type cmd, and press Enter. In the black Command Prompt window, type systeminfo and press Enter. The system will display a list of information about your computer.

Scroll down or search for the line that says System Boot Time. This shows the exact moment your PC last restarted. Like System Information, you will need to calculate the time elapsed yourself rather than seeing a ready-made uptime number. However, this method is useful if you want to see other system details at the same time, such as your operating system version or installed RAM.

What happens when you restart your PC

Every time you restart your computer, the uptime counter resets to zero. A restart clears the uptime because your PC powers down completely and then boots back up. If you see an uptime of "0 days, 0 hours, 2 minutes, 30 seconds," your computer has been running for only 2 minutes and 30 seconds since it last started.

Putting your PC to sleep or hibernation does not reset the uptime counter. Sleep mode keeps your computer in a low-power state while maintaining its running processes, so the uptime continues to count. Only a full restart or shutdown followed by a power-on will reset the counter to zero.

Why your uptime matters

Your PC uptime can tell you useful things about your computer's stability and your usage habits. A very high uptime—such as 30 days or more—means your computer has been running smoothly without crashes or forced restarts. If your uptime is very low and you did not intentionally restart, it may indicate your PC crashed or restarted unexpectedly.

Uptime also helps you understand when your computer last received updates. Windows often requires a restart to finish installing updates, so if your uptime is less than a day or two, you may have recently updated your system. Checking uptime before troubleshooting a problem can also help you determine whether a restart might fix the issue.

Frequently Asked Questions

Does sleep mode reset my uptime?

No. Sleep mode keeps your computer running in the background, so the uptime counter continues. Only a full restart or shutdown and power-on will reset the uptime to zero.

Why does my uptime show zero or very low numbers?

A low uptime means your PC has been restarted recently. This can happen because you restarted it yourself, Windows installed updates and restarted automatically, or your computer crashed and restarted unexpectedly. Check your Windows update history to see if updates caused the restart.

Can I see uptime for a PC that is not mine?

If you have remote access to another computer on your network, you can check its uptime using the same methods—Task Manager, System Information, or Command Prompt. You will need the proper permissions to access that computer remotely.

What is a normal uptime for a PC?

There is no single "normal" uptime. Home computers typically restart every few days to a few weeks, depending on how often you shut down or restart. Servers and workstations used continuously may have uptimes of months or years.