The Earth is about 12,742 kilometers in diameter on average, with a circumference of about 40,075 kilometers at the equator.

Quick Scoop: Size of Earth

Core stats (the essentials)

  • Mean diameter: about 12,742 km (7,918 miles).
  • Equatorial diameter: about 12,756 km (7,926 miles) – slightly wider at the equator.
  • Polar diameter: about 12,714–12,725 km (≈7,906–7,907 miles) – slightly shorter pole to pole.
  • Equatorial circumference: about 40,075 km (24,901 miles).
  • Polar circumference: about 40,008 km (24,860 miles).

Earth is not a perfect sphere; it’s an oblate spheroid, a bit squashed at the poles and bulging at the equator due to its rotation.

A bit more “how big is that really?”

  • Surface area: roughly 510 million square kilometers (about 71% covered by water).
  • Volume: about 1 trillion cubic kilometers, giving space for its layered interior (crust, mantle, outer core, inner core).
  • Mass: about 5.97 × 10²⁴ kilograms, which sets the gravity you feel at the surface.

If you could walk non‑stop around the equator at 5 km/h, it would take you over 330 days to circle the planet once.

In the solar system lineup

Here’s how Earth’s diameter compares with some neighbors:

[3] [3] [7][3] [3] [3]
Planet Diameter (km)
Mercury 4,879
Venus 12,104
Earth 12,742
Mars 6,779
Jupiter 139,820
So Earth is mid‑sized: much bigger than Mercury or Mars, smaller than gas giants like Jupiter and Saturn.

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