Minecraft Nether Portal Calculator

A Nether portal links to a spot eight times closer on the X and Z axes, and this converts a position in either direction. Enter an Overworld position to get the Nether coordinates to build at, or a Nether position to get the Overworld spot it points to. Y is never scaled, so the height carries across unchanged and only the Nether build limit clips it. The third tab compares two Overworld portals and says whether their Nether positions fall inside the 128 block search radius that makes portals steal each other's links. The ratio used is the Java Edition 1:8, which Bedrock also uses in an ordinary infinite world.