Theoretically, the gravitational forces that you experience are a contribution of the gravity from every piece of mass in the universe.

This is why, for example, the tides rise and fall with the relative directions of the moon and sun.

But their contribution is tiny compared to that from the earth.

We are in orbit around the sun, so we don’t personally experience it’s gravity as such. Like, if you are in orbit around the earth, you experience zero-G because you are effectively falling freely.

However, it does still have a value, which I believe is about 0.006 m/s^2, compared to the surface gravity of the earth, 9.81 m/s^2. The influence of the earth is 1600 times stronger.

Basically you can calculate the surface gravity of a planet if you know it’s mass and diameter.