Mercury
1st from the Sun
Diameter
4,879 km
About 0.38 Earths wide
Planet size duel
Jupiter is 11.2 times as wide as Earth.
Planet diameter quiz
Round 1 of 3
Jupiter
Earth
Same size until you answer, so the circles don't give it away. Guess to see them drawn to scale.
Planet birthdays
How many trips around the Sun? A toy year conversion, not a calendar-date calculation.
Diameter scale
Each circle's diameter is the planet's diameter divided by Jupiter's 142,984 km, on one linear scale. The circles overlap on a shared baseline so sizes compare directly.
Each bar's length is the planet's diameter divided by Jupiter's 142,984 km, on one linear scale. The bars share a left edge so sizes compare directly.
- Mercury 4,879 km
- Venus 12,104 km
- Earth 12,756 km
- Mars 6,792 km
- Jupiter 142,984 km
- Saturn 120,536 km
- Uranus 51,118 km
- Neptune 49,528 km
Rocky planets, zoomed in
Different scale from the chart above: here each circle's diameter is the planet's diameter divided by Earth's 12,756 km, so Earth fills the panel width.
- Mercury 4,879 km
- Venus 12,104 km
- Earth 12,756 km
- Mars 6,792 km
The eight planets
In order from the Sun
Venus
2nd from the Sun
Diameter
12,104 km
About 0.95 Earths wide
Earth
3rd from the Sun
Diameter
12,756 km
About 1 Earth wide
Mars
4th from the Sun
Diameter
6,792 km
About 0.53 Earths wide
Jupiter
5th from the Sun
Diameter
142,984 km
About 11 Earths wide
Saturn
6th from the Sun
Diameter
120,536 km
About 9.4 Earths wide
Uranus
7th from the Sun
Diameter
51,118 km
About 4.0 Earths wide
Neptune
8th from the Sun
Diameter
49,528 km
About 3.9 Earths wide
Data: NASA Planetary Fact Sheet (equatorial diameter), snapshot 2026-10-24.