Data from NASA’s Kepler space telescope has been used to compile a new estimates of Earth type planets.
The present data suggests that as many as 50% of Sol class stars contain earth sized planets which inhabit the favorable "Goldilocks" orbit where liquid water is still liquid.
As good as this sounds though, researches say that planets 2 or 3 times the mass of earth, roughly the size of Neptune or Uranus would be equally as common as Earth sized planets and with the size and atmosphere, not very likely to produce life as we know it.
Also a large portion of Earth sized worlds are likely to be well outside of the life zone. ether to close in to their primary or much to far outside the habitable zone.
Still, the chances are good for Sol type stars having Earth class planets