Minecraft
Nether Portal Sync
Nether portal linking is the single most common source of confusion in Minecraft multiplayer, and the cause is almost always two portals close enough in the Nether to fight over the same link.
How this is calculated
The Nether is compressed eight to one against the Overworld, so eight blocks of Overworld travel equals one block in the Nether. The calculator converts coordinates in both directions and warns when a new portal would land close enough to an existing one to link to it instead of creating its own.
The arithmetic
- nether = floor(overworld ÷ 8)
- overworld = nether × 8
- distance = √((x₁ − x₂)² + (z₁ − z₂)²)
What people get wrong
The linking search is generous, which is why portals that look far apart still connect. If two builds keep stealing each other's portals, the fix is to move the Nether-side portal further from its neighbour rather than adjusting the Overworld side.