Mars is a small rocky planet with a diameter of about 6,790–6,800 km, roughly half the size of Earth and about one-seventh of Earth’s volume.

Quick Scoop

  • Mean radius: about 3,390–3,396 km.
  • Diameter: about 6,791 km (often rounded to “about 6,800 km”).
  • Compared to Earth: about half Earth’s diameter, about 15% of Earth’s volume, and about 11% of Earth’s mass.
  • Surface gravity: about 38% of Earth’s (you would weigh a bit over one-third of your Earth weight there).
  • Surface area: about 28% of Earth’s total surface, but similar to Earth’s total land area because Earth is mostly ocean.

You can picture it like this: if Earth were the size of a nickel , Mars would be about the size of a raspberry sitting next to it.

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