That's a tricky question! It depends on what you mean by "planets":

In our solar system:

* We currently have 8 officially recognized planets. These are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Beyond our solar system:

* There are thousands of exoplanets (planets orbiting other stars) that have been confirmed by astronomers.

* Millions more are likely waiting to be discovered as technology improves.

* The exact number is unknown, but estimates range from billions to trillions of planets in the Milky Way galaxy alone!

So, the answer depends on your definition of "planets" and what you're counting. There are 8 in our solar system, thousands confirmed beyond it, and potentially billions or even trillions across the Milky Way.