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Mac OS X: How Do I Find Which Mac OS X Version Is on My Computer?

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Introduction

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.
To find the Mac OS X version number, click the Apple ( ) icon, and then click About This Mac . The About This Mac window opens, and displays the OS X version number.
Figure 1: An example of the Mac OS X version number displayed in the About This Mac window
Image: Mac OS X version number displayed in About This Mac window
In the example, the version is 10.7 (OS X Lion).
Follow these steps to view the build number for your Mac.
  1. Click the Apple ( ) 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 2: An example of the About This Mac window showing the location of the word 'Version'
    Image: An example of the About This Mac window showing the location of the word 'Version'
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.