All eight planets, side by side.
Jupiter is the largest planet at 142,984 km across — 11.21 times wider than Earth. Mercury is the smallest at 4,879 km, 0.38 times Earth’s width. Compare sizes, mass, gravity, density and orbits for every planet below.
Planet data compared
Select a column heading to sort. Rounded values from the NASA Planetary Fact Sheet; giant-planet gravity is at the 1-bar level.
| Mercury | 4,879 | 0.38× | 0.055 | 5.43 | 3.7 | 4.3 | 0.39 | 0.24 | 4,222.6 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|
| Venus | 12,104 | 0.95× | 0.816 | 5.24 | 8.9 | 10.4 | 0.72 | 0.62 | 2,802 | 0 |
| Earth | 12,756 | 1× | 1 | 5.51 | 9.8 | 11.2 | 1.00 | 1 | 24 | 1 |
| Mars | 6,792 | 0.53× | 0.108 | 3.93 | 3.7 | 5 | 1.52 | 1.88 | 24.7 | 2 |
| Jupiter | 142,984 | 11.21× | 317.9 | 1.33 | 23.1 | 59.5 | 5.20 | 11.86 | 9.9 | 95 |
| Saturn | 120,536 | 9.45× | 95.1 | 0.69 | 9.0 | 35.5 | 9.57 | 29.42 | 10.7 | 274 |
| Uranus | 51,118 | 4.01× | 14.5 | 1.27 | 8.7 | 21.3 | 19.16 | 83.75 | 17.2 | 29 |
| Neptune | 49,528 | 3.88× | 17.1 | 1.64 | 11.0 | 23.5 | 30.18 | 163.72 | 16.1 | 16 |
Your weight on every planet
Enter the number from your bathroom scale in any unit — pounds, kilograms or stone. Each result uses the same unit. Gas and ice giants are measured at the cloud tops.
Planet records
Which planet is the largest?
142,984 km across, 11.21× Earth’s width. About 1,321 Earths would fit inside.
Which planet is the smallest?
4,879 km across, 0.38× Earth’s width — only a little larger than our Moon.
Which planet is the most massive?
317.9 Earth masses — more than twice all the other planets combined.
Which planet is the lightest?
0.055 Earth masses. (Saturn is the least dense, but far from the lightest.)
Which planet is the hottest?
About 464 °C on average — hotter than Mercury because of its thick CO₂ atmosphere.
Which planet is tilted on its side?
Its axis is tilted 97.8°, so it rolls around the Sun on its side.
Planet comparison questions
What is the order of the planets by size?
From largest to smallest: Jupiter (142,984 km), Saturn (120,536 km), Uranus (51,118 km), Neptune (49,528 km), Earth (12,756 km), Venus (12,104 km), Mars (6,792 km), Mercury (4,879 km).
Which planet is closest in size to Earth?
Venus. It is 12,104 km across, 0.95 times Earth’s width, which is why it is often called Earth’s twin.
Which planet has gravity most like Earth’s?
Saturn, at about 9.0 m/s² compared with Earth’s 9.8 m/s². Venus (8.9 m/s²) is the closest match on a solid surface.
How many Earths can fit inside Jupiter?
About 1,321 by volume, comparing mean radii. Jupiter is 11.21 times wider than Earth and 318 times more massive.
Why does Saturn have lower gravity than its size suggests?
Gravity depends on mass divided by radius squared. Saturn has 95 times Earth’s mass, but its radius is about 9 times larger, so its cloud-top gravity of 9.0 m/s² is close to Earth’s.