How to Say I love you in Thai ?

 I love you = Phom rak khun (Male)
 I love you = Chan rak khun (Female)

When you want to say  I love you in Thai .

You can say " Phom/Chan rak khun ".

I love you =  " Phom rak khun " (if you are male).

I love you =  " Chan rak khun " (if you are female). 

I love you very much =  Phom/Chan rak khun maak

The other words to say I love you in Thai .

 Phom/Chan chop khun.
 Rak khun na.

 I love you in Thai Vocabulary :

I = Phom (male)
I = Chan (female)
Love = Rak
You = Khun
Very = Maak