XKCD published an infographic a few weeks ago, showing 786 known exoplanets (planets orbiting suns other than our own) in our Milky Way galaxy, and the Planetary Habitability Laboratory has released an interactive version of that map. Go to the interactive map.
Planets, on the interactive map, are drawn to scale using radius data. The data set also includes attributes such as atmosphere type, which is included in the information area on the left.
There are 786 exoplanets shown on the interactive map, but the Exoplanet Encyclopedia shows 777 planets as of today’s date.
There might be billion planets in our galaxy.
This is the XKCD infographic showing 786 known exoplanet: