The Milky Way galaxy is estimated to contain roughly 100 billion to 400 billion stars, and astronomers believe there is at least one planet per star on average. This suggests there could be between 100 billion and 400 billion planets in our galaxy

. More expansive estimates, considering the possibility of multiple planets per star system and including rogue planets not bound to stars, put the number of planets in the Milky Way much higher—ranging from about 800 billion to as many as 3.2 trillion or even up to 8 trillion planets

. Current confirmed discoveries include about 5,885 exoplanets (planets orbiting other stars) plus the 8 planets in our own solar system, totaling around 5,893 known planets in the Milky Way so far. However, this is only a tiny fraction of the estimated total

. In summary:

• Confirmed known planets: ~5,900 (including solar system planets and exoplanets discovered)
• Estimated planets based on stars and planetary formation rates: 100 billion to 400 billion (conservative)
• Higher estimates including multiple planets per star and rogue planets: 800 billion to several trillion

Thus, the Milky Way likely contains hundreds of billions to trillions of planets, far beyond the few thousand currently detected