Nether Portal Calculator
Convert Overworld and Nether coordinates and find where to build a portal so it links where you expect.
Coordinates
Paste coordinates
Plain “x y z” or the F3+C command
F3+C also sets the direction from the dimension it names.
/execute in minecraft:the_nether run tp @s 156 70 -104
An existing Nether portal within 16 blocks of X 156, Z -104 will be used instead of a new one.
Link checker
Will these two portals lead to each other?
This assumes no other portal is closer to the converted point. If one is, the game picks that one.
Nether height limits
- Build limit
- Y 0 to 255
- Bedrock floor
- Y 0 to 4
- Bedrock ceiling
- Y 123 to 127
- Roof surface
- Y 128 and up
- Lava sea level
- Y 31
The game never generates a new portal on the roof, but a portal you build up there yourself still works and links like any other.
The 1:8 rule
One block in the Nether equals eight blocks in the Overworld horizontally. To go to the Nether, divide X and Z by 8. To go back, multiply by 8. Y is not scaled. The game rounds down, so X -1 in the Overworld is X -1 in the Nether, not 0.
How portals link
When you enter a portal, the game converts your position and searches the other dimension for an existing portal around that point: 16 blocks in every horizontal direction in the Nether, 128 in the Overworld, across the full height. If it finds more than one, it uses the closest. If it finds none, it builds a new portal near the target. This describes Java Edition 1.16 and later.
Because the Overworld search area is so much larger, a portal pair can link one way but not the other. That is the usual reason a return trip lands you somewhere new. Building each portal at the exact converted coordinates avoids it.
ZCraft Studios
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