Cents, as the name implies, are 1/100th of a semitone (or "chromatic interval"), when working in 12-tone equal temperment (12-TET).
So, as long as your definition of "savar" is in relation to a "chromatic interval" that is defined as a 12th of an octave, then you should be able to convert back and forth by simply defining
1 savar = 2 cents.
However, if the Persian chromatic interval is not 1/12 of an octave, you will have to draw an equivalence in relation to the octave. The cent is 1/1200th of an octave. The savar is 1/(50*c) of an octave, where c is the number of equal chromatic intervals that make up an octave. You can then easily compare the two.