Where to find your BIOS version number

Your BIOS (Basic Input/Output System) is the firmware that runs before your operating system loads — it controls how your hardware talks to Windows or macOS. The fastest way to find your BIOS version depends on whether you use Windows or Mac, but both take under a minute.

On Windows, the easiest method is the System Information tool. Press the Windows key and type "System Information," then open it. Look for "BIOS Version/Date" in the list — you'll see something like "American Megatrends Inc. 1.23.4" or "Phoenix BIOS 2.0." That string of numbers is your version.

On Mac, open System Report by clicking the Apple menu, selecting "About This Mac," then clicking "System Report." Look for "Boot ROM Version" under the Hardware section. This serves the same purpose as BIOS on Windows machines.

Key Takeaways

  • Windows users can find BIOS version when ready by opening System Information and looking for "BIOS Version/Date" in the main list.
  • Mac users should open System Report from the Apple menu and look for "Boot ROM Version" under Hardware.
  • Your BIOS version tells you whether your computer has the latest firmware updates, which can fix security problems and hardware compatibility issues.
  • If you need to update your BIOS, you must restart your computer and enter the BIOS setup screen during startup — this is not done through Windows or macOS.

Why your BIOS version matters for computer performance

BIOS updates often include fixes for hardware bugs, better memory management, and patches for security vulnerabilities. If your computer is running slowly or certain devices aren't working properly, an outdated BIOS can be part of the problem.

Manufacturers like Dell, HP, Lenovo, and ASUS release BIOS updates periodically. Checking your current version is the first step to knowing whether an update is available for your specific model. You can then visit the manufacturer's support page and search for your computer's model number to see if a newer version exists.

How to check BIOS version using the command line

If System Information doesn't open or you want a faster method, Windows users can use the command line. Press Windows key + R, type "cmd," and press Enter. In the black window that appears, type wmic bios get smbiosbiosversion and press Enter. Your BIOS version will appear on the next line.

This method is useful if your System Information window is slow or unresponsive. The result will be the same — just a different way to reach it.

Understanding what the BIOS version number tells you

BIOS version numbers vary by manufacturer. Dell might show "1.23.4," while ASUS shows "3201," and HP shows "F.23." The format doesn't matter — what matters is whether it matches the latest version available for your computer model.

The date next to the version number (often shown as "BIOS Version/Date") tells you when that BIOS was released. If your date is more than two years old, it's worth checking whether an update is available. Newer isn't always necessary, but it's worth knowing.

Finding your computer model to check for BIOS updates

Once you know your BIOS version, you need your computer's model number to see if an update exists. On Windows, this is also in System Information — look for "System Model" near the top of the window. On Mac, it's listed as "Model Identifier" in System Report.

Write down both your model number and your current BIOS version. Then go to your manufacturer's support website (Dell.com/support, HP.com/support, Lenovo.com/support, or ASUS.com/support) and search for your model. Look for a "Downloads" or "Drivers & Software" section, then find BIOS in the list. Compare the version number shown there with the one you found on your computer.

What to do if you need to update your BIOS

If a newer BIOS version is available, read the file from your manufacturer's website to your computer. Do not interrupt this process — a failed BIOS update can make your computer unable to start. Make sure your battery is fully charged (or plug in a laptop) before you begin.

Most BIOS updates come with an installer program. Run it, and it will usually restart your computer automatically and install the update during startup. The process takes 5 to 15 minutes. Your computer may restart several times — this is normal. Do not turn it off or unplug it.

After the update finishes, restart your computer normally and check System Information again to confirm the new version number appears. If something goes wrong during the update, contact your manufacturer's support line — they can walk you through recovery steps.

Frequently Asked Questions

Is it safe to update my BIOS?

BIOS updates are safe when done correctly on a plugged-in or fully charged computer with no interruptions. The risk comes from power loss or forced shutdown during the update. If your computer is stable and working well, you don't have to update — but security patches in newer BIOS versions are worth considering.

Will updating my BIOS make my computer faster?

Not usually noticeably faster, but it can fix specific slowness caused by hardware bugs or memory issues. Updates are more often about stability and security than speed. If your computer is already running well, a BIOS update won't transform performance.

Can I check my BIOS version without restarting?

Yes. System Information and the command line method both show your BIOS version without restarting. You only need to restart if you're actually updating the BIOS itself.

What if my manufacturer doesn't have a newer BIOS version available?

Then your computer already has the latest version the manufacturer released for your model. You don't need to do anything. Check back every year or so if you want to stay current, but there's no urgency if your computer is working well.