Nether Coordinate Calculator
Convert coordinates between the Nether and the Overworld and check whether two portals link.
Coordinate conversion
X and Z change by a factor of 8; the height Y stays the same.
Portal link check
Stand in the portal and copy the coordinates from F3 or Show Coordinates.
The game searches a 256×256 square in the Overworld and 32×32 in the Nether, across the full world height, and picks the closest portal in a straight line — height difference included. If another portal is nearby, you may exit through it.
How Nether portals work
One block in the Nether equals eight in the Overworld along X and Z, while height stays the same. That makes travel through the Nether eight times shorter: a thousand Overworld blocks take only 125 in the Nether.
When you enter a portal, the game converts your coordinates and looks for a portal around that point. If it finds one, you exit through the closest; if not, it builds a new one nearby. That is why two portals built roughly in the right place often link to a third one instead of each other. The link check in the calculator shows both directions separately.
Frequently asked questions
How do I convert Overworld coordinates to the Nether?
Divide X and Z by 8 and keep Y unchanged. Going back from the Nether, multiply X and Z by 8. The rule is the same in Java and Bedrock.
Why does my portal lead to the wrong portal?
The game converts the coordinates and searches for a portal in a square around that point: in Java 256×256 blocks in the Overworld and 32×32 in the Nether, in Bedrock 256×256 in both. It picks the closest one in a straight line, height included. If your portal is outside the square or another one is closer, you exit there.
How do I link two portals reliably?
Build the first portal, convert its coordinates, and place the second one exactly at the result and at the same height. The search from both sides will then find each other.
What happens if there is no portal on the other side?
The game builds a new portal itself, looking for a suitable spot within 16 blocks horizontally of the converted point and at any height.