1
Jupiter
The undisputed giant of the solar system at nearly 143,000 km across — more than 11 times Earth's width and more massive than all the other planets combined more than twice over.
type: Gas giantorderFromSun: 5massEarthTimes10e24kg: 1898
Top 8 Largest Planets in the Solar System by Diameter
All eight planets ranked by equatorial diameter, from the gas giant Jupiter down to tiny Mercury, per NASA's Planetary Fact Sheet.
Quick answer: 1. Jupiter, 2. Saturn, 3. Uranus, 4. Neptune, 5. Earth, 6. Venus, 7. Mars, 8. Mercury.
The solar system has exactly eight planets, and they are wildly unequal in size. This list ranks all eight by equatorial diameter, using figures straight from NASA's Planetary Fact Sheet, so you can see at a glance how a gas giant like Jupiter dwarfs a rocky world like Mercury. It is built for anyone comparing the planets by scale — students, space enthusiasts, or the merely curious. Pluto and the other dwarf planets are not included, because the International Astronomical Union does not classify them as planets.
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Equatorial diameter
142,984
Jupiter 120,536
Saturn 51,118
Uranus 49,528
Neptune 12,756
Earth 12,104
Venus 6,792
Mars 4,879
Mercury The ranking
2
Saturn
The ringed gas giant is the second-largest planet, about 9 times wider than Earth at its equator and second only to Jupiter in both size and mass.
type: Gas giantorderFromSun: 6massEarthTimes10e24kg: 568
3
Uranus
The larger of the two ice giants at roughly 4 times Earth's width, Uranus is tipped on its side and rotates almost perpendicular to its orbit around the Sun.
type: Ice giantorderFromSun: 7massEarthTimes10e24kg: 86.8
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4
Neptune
The most distant planet is the smaller of the two ice giants, slightly narrower than Uranus but noticeably denser and more massive.
type: Ice giantorderFromSun: 8massEarthTimes10e24kg: 102
5
Earth
The largest of the four rocky terrestrial planets and the yardstick against which every other planet's size is measured.
type: TerrestrialorderFromSun: 3massEarthTimes10e24kg: 5.97
6
Venus
Nearly Earth's twin in size, Venus is just a few hundred kilometers narrower in diameter and sits second from the Sun.
type: TerrestrialorderFromSun: 2massEarthTimes10e24kg: 4.87
7
Mars
About half Earth's width, Mars is the second-smallest planet and the outermost of the rocky terrestrial worlds.
type: TerrestrialorderFromSun: 4massEarthTimes10e24kg: 0.642
8
Mercury
The smallest planet in the solar system, only about a third of Earth's width, and the closest world to the Sun.
type: TerrestrialorderFromSun: 1massEarthTimes10e24kg: 0.33
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Full comparison
| # | Name | type | orderFromSun | massEarthTimes10e24kg |
|---|---|---|---|---|
| 1 | Jupiter | Gas giant | 5 | 1898 |
| 2 | Saturn | Gas giant | 6 | 568 |
| 3 | Uranus | Ice giant | 7 | 86.8 |
| 4 | Neptune | Ice giant | 8 | 102 |
| 5 | Earth | Terrestrial | 3 | 5.97 |
| 6 | Venus | Terrestrial | 2 | 4.87 |
| 7 | Mars | Terrestrial | 4 | 0.642 |
| 8 | Mercury | Terrestrial | 1 | 0.33 |
How we ranked this
Planets are ranked by equatorial diameter in kilometers, as published in NASA's NSSDC Planetary Fact Sheet (metric). Equatorial diameter is used because the gas and ice giants are noticeably wider at the equator than pole-to-pole; the equatorial figure is the standard NASA-reported value and lets every world be compared on the same basis. Inclusion is limited to the eight bodies the IAU classifies as planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, Ceres, Eris, and other dwarf planets are excluded because they do not meet the IAU's definition of a planet. Rank 1 is the largest diameter; ties are not a factor since all eight values are distinct.
FAQ
What is the largest planet in the solar system?
Jupiter is the largest planet, with an equatorial diameter of about 142,984 km — more than 11 times the width of Earth. It is also more massive than all the other planets combined more than twice over.
What is the smallest planet in the solar system?
Mercury is the smallest planet, with an equatorial diameter of about 4,879 km, roughly one-third the width of Earth. It is also the closest planet to the Sun.
Why isn't Pluto on this list?
Pluto was reclassified as a dwarf planet by the International Astronomical Union in 2006, so it is no longer counted among the solar system's eight planets. This list ranks only the eight bodies the IAU classifies as planets.
Are planets ranked by diameter or by mass?
This list ranks planets by equatorial diameter, not mass. The two orders are nearly identical here, though not perfectly: Uranus is wider than Neptune, but Neptune is actually the more massive of the two ice giants.