The depth from the Earth's crust to its center is approximately 6,371 kilometers (3,959 miles).

Here's a breakdown of the Earth's layers and their approximate depths:

* Crust: 5-70 km (3-43 miles)

* Mantle: 2,900 km (1,800 miles)

* Outer Core: 2,200 km (1,400 miles)

* Inner Core: 1,220 km (760 miles)

Keep in mind that these are just average depths. The thickness of the crust varies greatly depending on location (thicker under continents, thinner under oceans).