Find the macOS version number on your Mac

Check About This Mac to find the version number and build number of your Mac operating system.

Knowing the macOS version number can help you determine whether your Mac is up to date or meets the system requirements of other software or devices. Learn how to update the software on your Mac.

Check About This Mac

  1. From the Apple menu (), choose About This Mac. The version number appears beneath “macOS” or “OS X.” 
  2. Click the version number to see the build number.


macOS Sierra

Version Build
10.12 16A323

OS X El Capitan

Version Build
10.11.6 15G31
10.11.5 15F34
10.11.4 15E65
10.11.3 15D21
10.11.2 15C50
10.11.1 15B42
10.11 15A284

OS X Yosemite

Version Build
10.10.5 14F27
10.10.4 14E46
10.10.3
with supplemental update
14D136
10.10.2 14C109
10.10.1 14B25
10.10 14A389

OS X Mavericks

Version Build
10.9.5 13F34
10.9.4 13E28
10.9.3 13D65
10.9.2 13C64
10.9.1 13B42
10.9 13A603

OS X Mountain Lion

Version Build
10.8.5 12F371, 12F45 or 12F20292
10.8.4 12E55
10.8.3 12D78
10.8.2 12C543, 12C60, or 12C20344
10.8.1 12B19
10.8 12A269
  1. If you have Mountain Lion v10.8.5 (build 12F37), you can install OS X v10.8.5 Supplemental Update to get OS X v10.8.5 (build 12F45).
  2. Build 12F2029 is available for the iMac (21.5-inch, Late 2013) with NVIDIA GeForce GT 750M only.
  3. If you have Mountain Lion v10.8.2 (build 12C54), you can install OS X v10.8.2 Supplemental Update 1.0 to get OS X v10.8.2 (build 12C60).
  4. Build 12C2034 is available for certain Macs only. It's installed by the OS X v10.8.2 Update for 13" MacBook Pro with Retina Display, 21.5" iMac (Late 2012), and Mac mini (Late 2012).

Earlier versions of OS X

Version Build
OS X Lion v10.7.5 11G56* or 11G63
OS X Lion v10.7 11A511
Mac OS X Snow Leopard v10.6.8 10K540 or 10K549
Mac OS X Snow Leopard v10.6.3
Retail installation disc
10D575
Mac OS X Snow Leopard v10.6
Retail installation disc
10A432, 10A433 (Server)
Mac OS X Leopard v10.5.8 9L30, 9L34 (Server 10.5.8 v1.1)
Mac OS X Leopard v10.5.6
Retail installation disc
9G66
Mac OS X Leopard v10.5
Retail installation disc
9A581
Mac OS X Tiger v10.4.11 8S165
Mac OS X Tiger v10.4
Retail installation disc
8A428
Mac OS X Panther v10.3.9 7W98
Mac OS X Panther v10.3.2
Installation disc
7D28
Mac OS X Panther v10.3
Installation disc
7B85
Mac OS X Jaguar v10.2.8 6R65 or 6R73
Mac OS X Jaguar v10.2.3
Installation disc
6G37, 6G35 (Server)
Mac OS X Jaguar v10.2
Installation disc
6C115
Mac OS X Puma v10.1.5 5S60, 5S66 (with Networking Update 1.0)
Mac OS X Puma v10.1
Installation disc
5G64, (5L14 or 5L17b with Security Update 10-19-01)
Mac OS X Cheetah v10.0
Installation disc
4K78

* If you have OS X v10.7.5 (build 11G56), you can install OS X v10.7.5 Supplemental Update to get OS X v10.7.5 (build 11G63).

Learn more

The operating system that came installed on your Mac might have a different build number.

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