Finding your Mac OS X version/build number

Learn how to find the Mac OS X version and build number on your computer. This information is helpful when you update the software or the operating system.

Finding your Mac OS X version number

To find the Mac OS X version number, click the AppleĀ icon, and then click About This Mac. The About This Mac window opens, and displays the OS X version number.

Figure : An example of the Mac OS X version number displayed in the About This Mac window

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In the example, the version is 10.7 (OS X Lion).


Finding your Mac OS X build number

Follow these steps to view the build number for your Mac.

  1. Click the AppleĀ icon, and then click About This Mac. The About This Mac window opens.
  2. Click the word ‘Version’ to toggle through the version, build, and serial number information for your Mac.

Figure : An example of the About This Mac window showing the location of the word ‘Version’

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Note: You can also access the OS X version and build number from the System Information dialog box. In the About This Mac window, click More Info to open the System Information dialog box.