How to Check if Your Computer Is 64 Bit

This article explains how to determine if your Computer/Server runs the 32-bit or 64-bit version of Windows.

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Steps

In Windows 7/Vista/Server 2008/R2

1. 1
   (1) Click on the Start Button: (2) Type 'System' in the Start Search box, and then (3) click "System" in the Programs list.
   
   
   
2. 2
   Under "System" window it will either state "32-bit Operating System" or "64-bit Operating System."
   
   
   

In Windows XP/2000/Server 2003

1. 1
   Press the WIN+R keys (Windows key and R). Type the following: sysdm.cpl and click OK.
   
   
   
2. 2
   Click on "System Summary": Under "System Type" it will either state "x86" if a 32-bit version of Windows is installed, or "EM64T" if a 64-bit version of Windows is installed.
   
   
   

On MacOsX

1. 1
   Launch Terminal app (see Applications/Utilities)
2. 2
   At prompt, type the following: "uname -a" (without the quotes) (note the blank space between "uname" and "-a" strings.
3. 3
   The terminal will display two lines of text. At the end of the 2nd line, you'll find something like either  
   1. RELEASE_I386 i386 ; the latest "i386" means that you're running 32bits kernel
   2. RELEASE_X86_64 x86_64 ; the latest "x86_64" means that you're running 64bits kernel