how big is mercury compared to earth

Earth is much bigger than Mercury: Mercury is about 38% of Earth’s diameter, about 10–15% of Earth’s surface area, and about 5–6% of Earth’s mass.

Quick Scoop: Mercury vs Earth

• Diameter
  • Mercury: about 4,879 km.

* Earth: about 12,742 km.
* So Mercury is roughly one‑third to two‑fifths as wide as Earth (about 0.38 Earths).

• Surface area
  • Mercury: about 75 million km².

* Earth: about 510 million km².
* Mercury has only around a tenth to a seventh of Earth’s surface area, so you could fit multiple Mercurys on Earth’s surface.

• Volume and mass
  • Volume: Mercury is about 5–6% of Earth’s volume (you could fit it inside Earth about 18 times).

* Mass: Mercury has about 5.5% of Earth’s mass.

* Despite being small, Mercury is very dense—its density is close to Earth’s.

• Gravity you’d feel
  • Surface gravity on Mercury is about 38% of Earth’s.

* If you weigh 100 kg on Earth, you’d feel like about 38 kg on Mercury.

A quick mental picture

Imagine Earth as a soccer ball. Mercury beside it would be more like a ping‑pong ball: clearly smaller, but still a solid little world rather than a tiny speck.

In short, when you ask “how big is Mercury compared to Earth,” the answer is: it’s a compact, dense world only about a third as wide and a twentieth as massive as our home planet.

Information gathered from public forums or data available on the internet and portrayed here.