All things · Countries & Worlds

Mars: how big is it?

Mars is about 6,780 km. In everyday terms, that is ≈ 766 Mount Everests.

Size

6,780 km

In metres

6.78 × 10⁶ m

Everyday comparison

≈ 766 Mount Everests

Chapter

Countries & Worlds

Did you know?

Home to Olympus Mons, a volcano about two and a half times taller than Everest.

How it compares

• About 2× bigger than the Moon (3,470 km).
• About 1.9× smaller than Earth (12,700 km).

Other things of a similar size

• Ceres 940 km
• Pluto 2,380 km
• River Ganga 2,530 km
• India (north to south) 3,210 km
• The Moon 3,470 km
• Earth 12,700 km

Sizes are rounded, typical values drawn from standard reference sources, including NIST/CODATA physical constants and NASA's planetary fact sheets. Real objects vary; see About for how sizes are chosen.