Planets by size
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Quick answer: largest diameter first, the order is Jupiter → Saturn → Uranus → Neptune → Earth → Venus → Mars → Mercury.
About this list
Equatorial diameter is the width of a planet across its equator. Jupiter is more than eleven times wider than Earth, while Venus and Earth are near twins.
| # | Item | km (equatorial diameter) |
|---|---|---|
| 1 | Jupiter | 142,984 |
| 2 | Saturn | 120,536 |
| 3 | Uranus | 51,118 |
| 4 | Neptune | 49,528 |
| 5 | Earth | 12,756 |
| 6 | Venus | 12,104 |
| 7 | Mars | 6,792 |
| 8 | Mercury | 4,879 |
Source: NASA planetary fact sheets.
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Frequently asked questions
What is the order of planets by size?
Largest diameter first: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury.
Which comes first and which comes last?
Jupiter comes first (142,984 km (equatorial diameter)) and Mercury comes last (4,879 km (equatorial diameter)) among the items in this quiz.
Where is this data from?
NASA planetary fact sheets.
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