Antipode Calculator

This tool finds the antipode of a place: the point you would reach by digging straight through the centre of the Earth. Give a latitude and longitude in decimal degrees, or in degrees, minutes and seconds, and it returns the opposite point in both forms along with the straight-line distance through the planet and the distance around its surface. The through-the-Earth figure is twice the geocentric radius on the WGS84 ellipsoid, so it shrinks from 12,756 km at the equator to 12,714 km at the poles. It does not tell you whether the antipode is land or ocean, because that needs a coastline dataset this tool does not carry.