Updated on 30-Mar-2017
Ever need to know what OS X Build correlates to which version? The simplest way to find out what version your running is in the Terminal with the command sw_vers.
Mac-VM1:~ max$ sw_vers ProductName: Mac OS X ProductVersion: 10.11.3 BuildVersion: 15D21

| Version | Build |
|---|---|
| macOS Sierra | |
| 10.12.4 | 16E195 |
| 10.12.3 | 16D32 |
| 10.12.2 | 16C67 |
| 10.12.1 | 16B2555 or 16B2557 |
| 10.12 | 16A323 |
| OS X El Capitan | |
| 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 | |
| 10.10.5 | 14F27 |
| 10.10.4 | 14E46 |
| 10.10.3 | 14D136 |
| 10.10.2 | 14C109 |
| 10.10.1 | 14B25 |
| 10.10 | 14A389 |
| Mavericks | |
| 10.9.5 | 13F34 |
| 10.9.4 | 13E28 |
| 10.9.3 | 13D65 |
| 10.9.2 | 13C64 |
| 10.9.1 | 13B42 |
| 10.9 | 13A603 |
| Mountain Lion | |
| 10.8.5 | 12F37, 12F45, 12F2029 |
| 10.8.4 | 12E55 |
| 10.8.3 | 12D78 |
| 10.8.2 | 12C54, 12C60, 12C2034 |
| 10.8.1 | 12B19 |
| 10.8 | 12A269 |
| Earlier Versions Start and end builds only |
|
| OS X Lion 10.7.5 | 11G56, 11G63 |
| OS X Lion 10.7 | 11A511 |
| Mac OS X Snow Leopard 10.6.8 | 10K540, 10K549 |
| Mac OS X Snow Leopard 10.6 | 10A432, 10A433 (Server) |
| Mac OS X Leopard 10.5.8 | 9L30, 9L34 (Server) |
| Mac OS X Leopard 10.5 | 9A581 |
| Mac OS X Tiger 10.4.11 | 8S165 |
| Mac OS X Tiger 10.4 | 8A428 |
| Mac OS X Panther 10.3.9 | 7W98 |
| Mac OS X Panther 10.3 | 7B85 |
| Mac OS X Jaguar 10.2.8 | 6R65, 6R73 |
| Mac OS X Jaguar 10.2 | 6C115 |
| Mac OS X Puma 10.1.5 | 5S60, 5S66 |
| Mac OS X Puma 10.1 | 5G64, 5L14, 5L17b |
| Mac OS X Cheetah 10.0 | 4K78 |
