Jupiter vs Mercury: size comparison
Jupiter: 139,820 km. Mercury: 4,879 km. Both silhouettes are drawn at the same scale.
Size ratio: ×29
Jupiter
139,820 km
What is measured Equatorial diameter of Jupiter
Its Great Red Spot is a storm wider than Earth.
Source : Wikipedia — Jupiter
Mercury
4,879 km
What is measured Diameter of Mercury
Mercury is barely larger than the Moon.
Source : Wikipedia — Mercury (planet)