Jupiter is bigger than all the other planets combined.

Jupiter is around 2.5 times bigger than all of the other planets in our solar system put together (this also includes Plutonian worlds)

Using Planetary Mass as a measurement we can see that Jupiter's mass is equal to just under 318 earths (According to various Nasa Sources).

If we took the next 4 planets in terms of size we would have Saturn (95 Earths), Uranus (14.5 Earths), Neptune (17 Eaths (Note Neptune Diameter is smaller than that of Uranus, thats why Uranus is always classified as a bigger planet) and then Earth (1 Earth), we see that the mass combined of these four is only 127.5 Earths, The remaining planets Venus (0.8 Earth) , Mars (0.1 Earth) and Mercury (0.055 Earth) add very little to the total mass of planets excluding Jupiter.