How big is Jupiter compared to Mercury?
28.7×wider than Mercury
Jupiter is 28.7× wider than Mercury — 139,820 km across against Mercury’s 4,879 km. By volume, about 23,535 Mercuries would fit inside Jupiter. Jupiter has 5,778× Mercury’s mass.
▶ See Jupiter and Mercury in 3D
Side by side
Diameter
Jupiter 139,820 km · Mercury 4,879 km
Width ratio
Jupiter is 28.7× wider
Volume
23,535 Mercuries fit inside Jupiter
Mass
Jupiter is 5,778× Mercury
Gravity (Jupiter · Mercury)
24.8 m/s² · 3.7 m/s²
Distance from Sun
5.2 AU · 0.39 AU
Line up about 29 Mercuries and they would just span Jupiter’s width — but it would take tens of thousands of them to fill its volume.
What sets them apart
The solar system’s largest and smallest planets, side by side. Jupiter is nearly twenty-nine times wider than Mercury, and so much more massive that Mercury’s contribution would round away to nothing. It is the single widest planetary size gap there is.
Ratios are easy to nod along to and impossible to picture. In the interactive view, switch to True scale to see Jupiter and Mercury at their honest relative sizes.
Keep going
✓ Facts verified July 2026
Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.