how deep is the inner core of the earth
The Earth’s inner core begins about 5,150 km below the surface and extends to the center of the planet at about 6,371 km deep. In other words, the inner core itself is roughly 1,220 km thick.
Quick Scoop
A simple way to picture it: if you drilled straight down, you’d pass through the crust, mantle, and outer core before reaching the solid inner core. The inner core is made mostly of iron and nickel and is extremely hot, but it stays solid because of the immense pressure.
Depth at a glance
| Feature | Depth |
|---|---|
| Start of inner core | About 5,150 km below the surface |
| Center of Earth | About 6,371 km below the surface |
| Inner core thickness | About 1,220 km |
One-line answer
The inner core is about 5,150 to 6,371 km deep below Earth’s surface.
TL;DR
The inner core is the deepest part of Earth, starting around 5,150 km down and reaching the center at 6,371 km.
