Luckily this is right up my wheelhouse.
There are an estimated 100 earthlike billion planets that lie in the goldilocks zone (habitable zone) in our galaxy. While galaxies range from small (about 1,000 stars) to very large (100 trillion stars), if we expect the number of 100 billion to average out, and there are about 500 billion galaxies in our observable universe that means there are roughly 50 Sextillion (5 x 10^22) earthlike planets in their parent stars habitable zone.
To put that in other words, there are an estimated 50,000,000,000,000,000,000,000 potentially habitable planets in the universe.
This doesn't take into account moons of Jovian planets (like Titan for example) that may harbor life either. There's a pretty good chance that there is microscopic life out there, and we will find evidence of it soon, but looking at it from a pure numbers standpoint, there's a good chance some of those planets have intelligent life on them. Even if there's a .00000000001% chance, that's still a lot of planets.
The problem is getting there. I have no doubts that there is life out there, even intelligent life. I also believe that we will find evidence of life in our lifetimes (afterall that is my area of focus) but it'll almost certainly be microscopic life, not some little green guys. I doubt that in my lifetime we'll find intelligent life, and we may never find it before we kill ourselves (unless we do the smart thing and learn how to get out of our solar system), but it's out there among the stars.