EVEN THOUGH / EVEN IF

Even though 

Even though is used to express a fact, something that is real or true.
Even though means 'despite/in spite of' the fact'.
It is more emphatic than 'though' or although'.

• Even though John is rich, he lives in a small house.
  (John is rich, but despite having money he lives in a small house.)
• Even though she likes animals, Mary doesn't want a dog.
  (In spite of the fact that she likes animals, Mary doesn't want a dog.)
• Even though the building was damaged, business went on as usual.
  (The building was damaged, but despite that business went on as usual.)
• Even though I washed it several times, I couldn't get rid of the stain.
  (I couldn't get rid of the stain despite washing it several times.)

Even if

Even if is used in a supposition or hypothesis.
It refers to an imaginary or unreal situation

• Even if Caroline earned a big salary, she would not buy a fast car.
  (Caroline doesn't like fast cars. It is not because of the price that she won't buy one.)
• Even if I had time and money, I still wouldn't go on a cruise.
  (It's not because I have no time or no money that I won't go on a cruise.
  I have other reasons for not going.)
• I wouldn't wear that dress even if I got it for free!
  (Imagine getting that dress for nothing. I still wouldn't wear it!)