how much ram does my macbook pro have?

How can I tell how much ram memory my mac book pro originally came with? I now only have 2 gbs left and am running out of space with all my photos, aps, videos and music. I don't want to keep moving things on and off the computer with an external hard drive. Is there a way to get more ram? My ipad has 64gbs and holds everything - but apparently my computer doesn't.