How big is Uranus compared to Mercury?
Data as of July 2026
10.4×wider than Mercury
Uranus is 10.4× wider than Mercury: 50,724 km across against Mercury’s 4,879 km. By volume, about 1,124 Mercuries would fit inside Uranus. Uranus has 264× Mercury’s mass.
▶ See Uranus and Mercury in 3D
Side by side
Diameter
Uranus 50,724 km · Mercury 4,879 km
Width ratio
Uranus is 10.4× wider
Volume
1,124 Mercuries fit inside Uranus
Mass
Uranus is 264× Mercury
Gravity (Uranus · Mercury)
8.7 m/s² · 3.7 m/s²
Distance from Sun
19.2 AU · 0.39 AU
Mercury goes round the Sun in 88 days, so it completes nearly 350 orbits for every one that Uranus makes.
What sets them apart
Uranus is more than ten times wider than Mercury and over 260 times its mass. They sit far apart in the solar system too: Mercury orbits at 0.39 AU from the Sun, Uranus at 19.2 AU, about 49 times farther out.
Ratios are easy to nod along to and impossible to picture. In the interactive view, switch to True scale to see Uranus 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 Found something out of date?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.