Convert Overworld and Nether coordinates, link portals correctly and plan your Nether hub — Java & Bedrock.
1 : 8JAVA & BEDROCKLINK CHECKER
Overworldcalculated
Nethercalculated
Enter X and Z to convert your coordinates.
Type in either panel, paste F3+C or swap the direction. Java searches 16 blocks around the converted point in the Nether and 128 in the Overworld; Bedrock searches 128 in both.
Show the search area (top-down, north up)
Enter coordinates to see the search area. Dots are portals from the link checker below; the outlined one is where you would arrive.
Add your portals in both dimensions. Give a portal and its partner the same name and the checker shows where each one really leads, and how to fix mislinks.
No portals yet. Add one, add the pair from the calculator, or load the example.
Waypoints & travel times
Saved in this browser only
No waypoints yet. Save your base, farms or a stronghold and see the distance, direction and travel time from where you stand, through the Overworld and through the Nether.
Saving is unavailable in this browser (private mode or blocked storage): waypoints and portals last until you close the page. Use Export to keep them.
How Nether portal linking works
The 1:8 rule
One block in the Nether equals 8 blocks in the Overworld, on the X and Z axes only. To find the Nether position of a portal, divide its Overworld X and Z by 8 and round down; to go back, multiply by 8. Y is not scaled. Rounding down matters for negative numbers: X -1 becomes -1 in the Nether (not 0), and X -9 becomes -2.
Search radius in Java vs Bedrock
When you enter a portal, the game converts your position and searches the other dimension for an existing portal around that point, over the full height. The closest one wins (3D distance). If there is none, it builds a new portal nearby.
Destination
Java Edition
Bedrock Edition
Nether (entering from the Overworld)
33 × 33 (±16)
257 × 257 (±128)
Overworld (entering from the Nether)
257 × 257 (±128)
257 × 257 (±128)
New portal if none is found
within 16 blocks
within 16 blocks
Why portals mislink and how to fix it
Two Overworld portals close together (less than 128 blocks apart on X and Z in Java) share one search area in the Nether, so both can lead to the same Nether portal.
A partner built by eye a few blocks off its converted position can lose against an older portal that happens to be closer to the target point.
The return trip searches 128 blocks in the Overworld, so a Nether portal can bring you back to a different Overworld portal than the one you came from.
The fix is the same every time: build each partner at the exact converted coordinates from the calculator, then add both portals to the link checker to confirm the link works in both directions. More background in our wiki article on Nether portals.
Because every Nether block counts as eight, a central hub with tunnels to your bases turns long trips into short ones. 10,000 blocks in the Overworld are only 1,250 blocks in the Nether: about 30 minutes of sprinting on the surface, or roughly 17 seconds in a boat on blue ice.
Put the hub near Nether 0 / 0 and run straight tunnels along the X and Z axes, then branch off to each base.
Build each base portal at the converted coordinates of its tunnel exit, so every portal links back to the right place.
Boats on packed ice reach about 40 blocks per second, on blue ice about 73. Two-block-high tunnels with a slab or trapdoor roof keep the boat on track.
Nether Y-levels
Y 0–4: bedrock floor. Y 123–127: bedrock roof.
Y 31: surface of the lava sea; tunnels above Y 32 stay dry.
Y 15: most ancient debris (it spawns from Y 8 to Y 119).
Y 70–118: where the game forces a new Nether portal when it finds no safe spot.
Frequently asked questions
How do I convert Overworld coordinates to the Nether?
Divide the Overworld X and Z by 8 and round down; Y stays the same. X 1200 / Z -340 in the Overworld becomes X 150 / Z -43 in the Nether. To go back, multiply the Nether X and Z by 8. The calculator above does both directions live.
Why did my portal link to the wrong portal?
When you step into a portal, the game converts your position to the other dimension and uses the closest existing portal inside the search area (16 blocks around the point in the Java Nether, 128 blocks everywhere else), measured in 3D. If another portal is closer to that point than the partner you built, you end up there. Build every partner at the exact converted coordinates and test your setup with the link checker on this page.
How far apart must portals be?
Portals built at the exact converted coordinates of their partners can be close together. Without that, keep Overworld portals more than 128 blocks apart on X or Z in Java Edition (16 blocks in the Nether), so each one finds its own partner. In Bedrock Edition the Nether search area is 128 blocks, so Nether portals that must not share a link need more than 128 blocks between them (1,024 in the Overworld).
Does Y matter?
Y is not scaled: Y 64 in the Overworld is Y 64 in the Nether. The search covers the full height and the closest portal in 3D wins, so a portal far above or below can lose against one a few blocks to the side. A new portal is placed close to your Y level; if the game has to force it, a Nether portal ends up between Y 70 and Y 118.
Is it different on Bedrock?
The 1:8 ratio is the same. Bedrock Edition searches 128 blocks around the target in both dimensions, while Java Edition searches only 16 blocks in the Nether, so Bedrock portals link over much larger distances and mislinks are more common. Bedrock has no F3+C: turn on "Show coordinates" in the world settings and type the numbers in.
Can I build a portal on the Nether roof?
In Java Edition, yes. Above the bedrock ceiling (Y 128 and up) portals work and link like any other, and the mob-free roof is a popular ice-boat highway. The game never generates a portal up there, so build the roof portal yourself. In Bedrock Edition the Nether ends at Y 128, so there is no room above the roof.
