Nether Portal Calculator
Enter your coordinates and see exactly where to build the matching portal in the other dimension. The Nether is compressed 8:1 — every block you walk there equals eight in the Overworld — so getting the converted X and Z right is what makes two portals link to each other instead of spawning a stray portal in the wrong spot.
Enter your Overworld coordinates (F3 on Java, chunk map on Bedrock):
Build your Nether portal at (divide X and Z by 8):
X
125
Y (unchanged)
64
Z
-32
And the other direction — if these were Nether coordinates:
Overworld X 8,000, Y 64, Z -2,000
Portal link check
When you step through a portal, the game looks for an existing portal near the converted coordinates in the destination dimension — commonly documented as roughly a 128-block search radius in the Overworld and 16 blocks in the Nether. If your Nether portal is built at X 125, Z -32 (or as close as terrain allows), it will link back to your Overworld portal at X 1,000, Z -250. Y does not need to match — only the horizontal position matters for linking.
Why 1 Nether block = 8 Overworld blocks
The Nether is a scaled-down mirror of the Overworld on the horizontal axes: moving 1 block along X or Z in the Nether corresponds to 8 blocks in the Overworld. Converting is therefore simple division — an Overworld base at X 1,000, Z −250 maps to Nether X 125, Z −32 (X and Z divided by 8, rounded down). The vertical axis is the exception: Y is not scaled at all, and the two dimensions’ heights are independent of each other.
This is also the whole trick behind Nether highways. Traveling 1,000 Overworld blocks takes minutes on foot — but the same trip is only 125 blocks through a Nether tunnel. Players connect distant bases by building a portal at each base, converting the coordinates, and digging a straight tunnel between the converted points in the Nether.
How portal linking actually works
When you enter a portal, the game converts your position into the destination dimension’s coordinates and searches for an existing portal nearby — commonly documented as roughly a 128-block radius when arriving in the Overworld and about 16 blocks when arriving in the Nether (the same distance measured in each dimension’s own scale). If it finds one, you come out there; if not, a new portal is generated as close to the ideal spot as the terrain allows.
The practical rule: never let the game guess. Calculate the converted coordinates with this tool, go to that exact spot in the destination dimension, and build the second portal by hand. Manually paired portals at matching converted X/Z link reliably in both directions — automatically generated ones are what cause the classic “my portal dumped me somewhere new” problem.
More build tools
Planning the base at the other end? The Minecraft circle generator gives you pixel-perfect block charts for round towers and domes. For loot draws and random decisions, try the random number generator or the dice roller.
Frequently asked questions
Minecraft is a trademark of Mojang Synergies AB / Microsoft. This is an unofficial fan tool and is not affiliated with, endorsed by, or associated with Mojang or Microsoft. No game assets are used.