The first thing you want to do is to turn on your Mac computer. Once the system is turned on and the home screen is displayed, you can start to move the cursor.
You will now have to go and click the Apple menu button. This is the little Apple Icon that is located in the top left corner of your screen.
Once you have clicked this button, simply scroll down and click the About This Macintosh, or the About This Computer button.
Once you have done this, look for the area which says Total Memory line. This is where it will give you a numeric representation on just how much RAM your Mac actually has. When you click it, it will either give you the figure in Kilobytes, Megabytes or Gigabytes. Ideally the RAM is listed in Gigabytes.
If you feel the RAM on your Mac is not sufficient, you can always and increase it. This can be done by adding more RAM cards in the extra RAM slots on the motherboard, or by replacing the old RAM card with a much more powerful one.
Alternatively, you may also try and check out just how much RAM your Mac has by looking at the box that the Mac came in, or by reading the booklet that came with it.
Most MAC computers don't allow you to upgrade your RAM, so in case you plan on changing it, you should make sure that you have one that lets you increase it or you will have to get a new device altogether.