On average half the stars might have planets, assuming around 10 planets per star (so an average of 5 planets for each star) around 500 billion, billion planets.
There are about 480 which have been discovered so far in the universe a handful of them are dwarf planets. Hope this helps!!!!
We have no idea how many there may be in total, but as of mid-2010, evidence of over 400 had been detected.
current planet count is:528 earthlike planets:0