It's quite simple. Go to the Apple logo and select 'About this Mac.'

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If it says Core Duo, then it is 32bit. If it says Core 2 Duo, then it is 64bit (ignore the 32bit kernel issue, it will run 64bit software just fine).

Physically, if your MBP has a black keyboard, it is absolutely 64bit. The original MBPs had a silver keyboard and the 32bit units were all but replaced in early 2007. So if you purchased your model even in the later course of 2007, then it is a Mac capable of running 64bit. Also, if you are running Lion, then you are 64bit (as Lion does not run on 32bit Macs).

– user10355 Aug 31 '11 at 18:15. To tell if you are running the 32-bit or 64-bit kernel (which matters for some device drivers), launch System Profiler and click on the Software heading in the Contents section. The line 64-bit Kernel and Extensions will say Yes if you are running the 64-bit kernel and No if you are running the 32-bit kernel. Note: Mac OS X 10.6 Snow Leopard is the last release that a 32-bit Intel Mac can run, Mac OS X 10.7 Lion and up are, by default, 64-bit.

Additionally, System Profiler was renamed to System Information in OS X 10.7. As you may have seen from all the answers - macs are different than other Operating Systems (OS) in that the 32 bit and 64 bit dividing line is all blurry. Microsoft office for mac. You can have 32 bit code run on a 64 bit CPU.

A nice overview of this subject is at Keep in mind, this transition was started before Tiger was released on April 29, 2005 and is still happening. What Is 64-Bit Computing? For the purposes of this document, 64-bit computing is defined as support for a 64-bit address space—that is, support for concurrent use of more than 4 GB of memory by a single executable program—no more, no less. Beginning with version 10.4, Mac OS X supports command-line 64-bit executables on G5-based Macintosh computers and 64-bit-capable Intel Macintosh computers. Beginning with version 10.5, Mac OS X supports full-featured 64-bit applications on G5-based and 64-bit-capable Intel Macintosh computers. Beginning with Snow Leopard, Mac OS X uses a 64-bit kernel on some Intel computers. Also - CPU that are '64-bit' still have parts that are only 32 bits wide.

Similarly, CPU that are '32-bit' also have parts that are 128 bits (or more) wide. This is why most people focus on the address space for a specific program rather than whether the hardware is '64-bit' or how much of it is '64-bit' It really doesn't matter until you get to a more specific question. Why are you asking about this? I hope this general overview helps your understanding of what people really mean when they are discussing their bits. I like bisko's answer because it helped me to find a way to tell for sure what I am currently running - 32-bit or 64-bit. I have a version of VMWare that will only run in 32-bit, and since upgrading to Lion, it boots into 64-bit, so I need to reboot and hold the 3+2 keys down upon booting up to make it run in 32-bit mode.