Install Gparted and then open it and it will show you your partition layout including the swap partition!, open a terminal (Ctrl + Alt + t) and paste the following command to install it:
sudo apt-get install gparted
You will find the app once installed in the top panel: System > Administration > Gparted
Right click the swap partition box and then on "Information":
Then you will get this:
To find out how much RAM you have, paste the following command in a terminal:
sudo lshw
and then look for " *-memory:0":
