Nether Portal Calculator

How to use this calculator

Stand at your Overworld portal, press F3 (Java) or turn on Show Coordinates (Bedrock), and enter the X and Z of the portal block. The calculator gives you the Nether coordinates to build the matching portal at, and the range within which the game would still find it. Build there, light it, and the two portals link every time. Going the other way — you found a good spot in the Nether and want to know where it comes out — switch the direction and enter the Nether coordinates.

Why portals link to the wrong place

The Nether is compressed eight to one. Every block you walk in the Nether is eight blocks of Overworld, which is why a Nether tunnel is the fastest way to cross a world before elytra. When you step through a portal, the game divides your X and Z by eight (or multiplies, coming back), then looks for an existing portal near that point. The search is generous: 128 blocks in the Overworld, and in the Nether 16 blocks on Java but 128 blocks on Bedrock. If a portal exists in that radius, you appear at it, even if you built a different one you meant to arrive at.

That radius causes two classic problems. First, two Overworld portals near each other — a base and a farm 100 blocks apart, say — both map to a single Nether portal, and the return trip from the Nether drops you at whichever the game finds first. Second, a Nether portal built even 20 blocks off the scaled position can fail to be found and the game spawns a fresh portal beside it. The fix for both is the same: build every Nether-side portal at the exact scaled coordinates this calculator gives, and keep Overworld portals at least 256 blocks apart if each needs its own Nether portal. If they must be closer, put the Nether portals at their exact coordinates anyway — on Java the 16-block Nether radius is tight enough to keep them distinct. On Bedrock the Nether search also covers 128 blocks, so nearby portals are much more likely to share a link: build at the exact coordinates and test each portal before you rely on it.

Building a Nether hub

A hub is a central Nether portal with tunnels to portals for each Overworld destination. To plan one: calculate the Nether coordinates for each Overworld portal, note the Y level you want the hub on (a common choice is around Y 64–80 in the Nether, above most lava lakes and below the ceiling), and dig tunnels to those points. Line the tunnels — ghasts cannot see you through walls and nothing spawns on slabs or in lit tunnels — and lay ice or blue ice on the floor for boats. Our Nether guide has the safety details and the distance calculator works out how long each tunnel takes.

Frequently asked questions