How much free ram should be available?

The ram that is available is determined by the applications actively operating right? Therefore if I quit some applications the free space shown in "Activity Monitor" should increase right? But how about the inactive space; Shouldn't that be considered free space too? Please help I think I might need more ram memory. Thanks in advance.

Here's the rundown on memory usage (from the Help menu in Activity Monitor)
"Wired: Wired memory is information that can’t be cached to disk, so it must stay in RAM. The amount depends on what applications you are using.
Active: Active memory is currently in RAM and actively being used.
Inactive: Inactive memory is no longer being used and has been cached to disk. It will remain in RAM until another application needs the space. Leaving this information in RAM is to your advantage if you (or a client of your computer) come back to it later.
Used: Used memory is being used by a process and not immediately available.
Free: Free memory is not being used and is immediately available.
VM size: Virtual memory, or VM, is hard disk space that can be used as memory. VM size is the amount of disk space memory being used. Mac OS X can use more memory than the amount of physical RAM you have. A hard disk is much slower than RAM, so the virtual memory system must automatically distribute information between disk space and RAM for efficient performance.
Page ins/outs: The number of times Mac OS X has moved information between RAM and disk space."
The way I understand it is that as long as you have few or no Page Outs you are fine with the RAM you have. Also, as you can see, the Inactive Memory is available for use by other apps if necessary.
Hope this helps.
Rick

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Przemek P wrote:
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lyndaapple wrote:
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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