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 giantmass10e24kg: 1898meanDistanceAU: 5.2
Top 10 Largest Planets in the Solar System by Diameter
The ten largest bodies classified as planets or dwarf planets by the IAU, ranked by equatorial diameter from Jupiter down to Eris, per NASA's Planetary Fact Sheet and IAU data.
Quick answer: 1. Jupiter, 2. Saturn, 3. Uranus, 4. Neptune, 5. Earth, 6. Venus, 7. Mars, 8. Mercury, 9. Pluto, 10. Eris.
The solar system's largest worlds are a study in extremes. This list ranks the ten largest bodies that the International Astronomical Union classifies as either planets or dwarf planets — from the gas giant Jupiter, which could swallow over 1,300 Earths, down to the distant dwarf planet Eris, whose discovery in 2005 reshaped how we define a planet. All eight IAU-classified planets are included, plus the two largest dwarf planets: Pluto, the former ninth planet, and Eris, the most massive known dwarf planet. Diameters are equatorial figures from NASA's NSSDC Planetary Fact Sheet, giving every world a consistent basis for comparison. The list is designed for students, space enthusiasts, and anyone curious about the scale of the worlds that share our Sun.
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Equatorial diameter (km)
142,984
Jupiter 120,536
Saturn 51,118
Uranus 49,528
Neptune 12,756
Earth 12,104
Venus 6,792
Mars 4,879
Mercury 2,377
Pluto 2,326
Eris The ranking
2
Saturn
The ringed gas giant is the second-largest world, about 9 times wider than Earth at its equator and second only to Jupiter in both size and mass. Its iconic ring system spans over 280,000 km.
type: Gas giantmass10e24kg: 568meanDistanceAU: 9.6
3
Uranus
The larger of the two ice giants at roughly 4 times Earth's width, Uranus is tipped on its side with an axial tilt of 98 degrees, rotating almost perpendicular to its orbit around the Sun.
type: Ice giantmass10e24kg: 86.8meanDistanceAU: 19.2
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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, with the strongest winds of any planet in the solar system.
type: Ice giantmass10e24kg: 102meanDistanceAU: 30.1
5
Earth
The largest of the four rocky terrestrial planets and the yardstick against which every other world's size is measured. Earth is the only known planet to host life.
type: Terrestrialmass10e24kg: 5.97meanDistanceAU: 1
6
Venus
Nearly Earth's twin in size, Venus is just a few hundred kilometers narrower in diameter and sits second from the Sun. Its thick carbon dioxide atmosphere makes it the hottest planet in the solar system.
type: Terrestrialmass10e24kg: 4.87meanDistanceAU: 0.72
7
Mars
About half Earth's width at roughly 6,800 km, Mars is the second-smallest planet and the outermost of the rocky terrestrial worlds. It hosts the largest volcano in the solar system, Olympus Mons.
type: Terrestrialmass10e24kg: 0.642meanDistanceAU: 1.52
8
Mercury
The smallest planet in the solar system, only about a third of Earth's width, and the closest world to the Sun. Its surface is heavily cratered and resembles Earth's Moon.
type: Terrestrialmass10e24kg: 0.33meanDistanceAU: 0.39
9
Pluto
The largest known dwarf planet by volume, Pluto was reclassified from planet to dwarf planet by the IAU in 2006. Its surface features a heart-shaped glacier, ice mountains, and a thin nitrogen atmosphere.
type: Dwarf planet (Kuiper Belt)mass10e24kg: 0.013meanDistanceAU: 39.5
10
Eris
The most massive known dwarf planet, Eris is slightly smaller than Pluto in diameter but 27% more massive. Its discovery in 2005 directly prompted the IAU to create the dwarf planet classification and reclassify Pluto.
type: Dwarf planet (Scattered Disc)mass10e24kg: 0.0165meanDistanceAU: 67.7
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Full comparison
| # | Name | type | mass10e24kg | meanDistanceAU |
|---|---|---|---|---|
| 1 | Jupiter | Gas giant | 1898 | 5.2 |
| 2 | Saturn | Gas giant | 568 | 9.6 |
| 3 | Uranus | Ice giant | 86.8 | 19.2 |
| 4 | Neptune | Ice giant | 102 | 30.1 |
| 5 | Earth | Terrestrial | 5.97 | 1 |
| 6 | Venus | Terrestrial | 4.87 | 0.72 |
| 7 | Mars | Terrestrial | 0.642 | 1.52 |
| 8 | Mercury | Terrestrial | 0.33 | 0.39 |
| 9 | Pluto | Dwarf planet (Kuiper Belt) | 0.013 | 39.5 |
| 10 | Eris | Dwarf planet (Scattered Disc) | 0.0165 | 67.7 |
How we ranked this
Bodies are ranked by equatorial diameter in kilometers. 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 ten bodies that the IAU classifies as planets or dwarf planets with the largest equatorial diameters: the eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) plus the two largest dwarf planets (Pluto and Eris). Dwarf planets smaller than Eris (Ceres, Makemake, Haumea) are excluded because they fall below the 2,000 km threshold that defines the top ten. Diameter figures are sourced from NASA's NSSDC Planetary Fact Sheet (metric) and, for Eris, from the JPL Small-Body Database and IAU-recognized measurements. Rank 1 is the largest diameter; all ten values are distinct so ties are not a factor.
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.
Why are Pluto and Eris on this list?
The IAU defines a planet as a body that orbits the Sun, has enough mass to be round, and has cleared its orbital neighborhood. Pluto and Eris meet the first two criteria but not the third, so they are classified as dwarf planets. This list includes all ten largest bodies that are either planets or dwarf planets, giving a fuller picture of the solar system's biggest worlds.
Which is bigger, Pluto or Eris?
Pluto is slightly larger by diameter (2,377 km vs. 2,326 km) and by volume, but Eris is more massive — about 27% heavier than Pluto. This is because Eris is denser, composed of rock and ice with less frozen nitrogen on its surface.
Are all ten bodies ranked the same way by diameter as they are by mass?
Not quite. While the diameter and mass rankings are similar for the eight planets, the dwarf planets swap order: Pluto is larger by diameter (rank 9) but Eris is more massive despite being smaller (rank 10). Among the ice giants, Uranus is wider than Neptune but Neptune is more massive.