Nether portal calculator_
Convert coordinates between the Overworld and the Nether, get the exact spot to build so two portals link, and check whether a nearby portal will steal the link. Java and Bedrock.
CAM_01 · REC /execute in minecraft:the_nether run tp @s 0 64 0Works for Java and Bedrock: both use the same 8:1 ratio. Coordinates are floored, so negative positions round away from zero (X −9 is Nether X −2, not −1), the detail most calculators get wrong.
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The ratio, in one line
Horizontally the Nether is eight times smaller than the Overworld. Going in, divide X and Z by 8; coming out, multiply by 8. Vertically nothing is scaled: Y is carried across as-is. That is the whole rule, and it is identical in Java and Bedrock. Everything else people find confusing about portals comes from the two things below.
Negative coordinates round down, not toward zero
This is the one most calculators get wrong, and it is why a portal built west or north of spawn sometimes misses by a block. The game floors the division. Floor means toward negative infinity, so −9 ÷ 8 = −1.125 becomes −2, not −1. One block off is enough to land outside the portal frame you built.
| Overworld X | Value | Nether X (floored) | If you truncate instead |
|---|---|---|---|
| A base east of spawn | 800 | 100 | same |
| Just past spawn | 9 | 1 | same |
| Right of origin | 7 | 0 | same |
| Left of origin | -1 | -1 | 0 (wrong) |
| Just west of spawn | -9 | -2 | -1 (wrong) |
| A base west of spawn | -800 | -100 | same |
How linking actually works
Walking into a portal does not teleport you to the matching coordinate directly. The game calculates that coordinate, then searches for an existing portal within 128 blocks of it. If it finds one, you come out there. Only if it finds nothing does it build a fresh portal for you, roughly at the target.
Two consequences follow, and together they explain almost every "my portal goes to the wrong place" post:
- An existing portal always wins. Build and light the destination portal yourself at the exact coordinates before you travel, and the pair is locked together.
- Nearby portals steal links. Two Overworld portals closer than 1,024 blocks map to Nether targets less than 128 blocks apart, so whichever portal exists first can capture both. The collision checker in the tool above tells you before you dig.
Building a Nether hub
The 8:1 ratio is why Nether travel is worth the effort: 100 blocks of tunnel is 800 blocks of Overworld. The reliable recipe, in order:
- Stand at the Overworld destination and note the coordinates (F3, or F1 then the map on Bedrock).
- Divide X and Z by 8 with the calculator above. Example: 1200, 70, -640 becomes
150, 70, -80. - Travel there through any portal, tunnel to that exact coordinate, then build and light the frame there.
- Walk through it. You should arrive at the Overworld spot; if you do not, another portal was nearer than 128 blocks.
- Keep every hub portal at least 128 Nether blocks from the next, and label each one with a sign carrying its Overworld coordinates.
Height, and the bedrock roof
The Nether's playable column runs from Y 0 to Y 127; the Overworld runs from Y -64 to Y 319. Because Y is not scaled, a mountain-top portal at Y 200 cannot map to Y 200 in the Nether, and you arrive under the roof instead. If a destination lands somewhere hostile (inside lava, or in a lava ocean at low Y), build the frame higher and enclose it: the portal you make yourself is the one the game will use.
When it still goes wrong
| Symptom | Cause | Fix |
|---|---|---|
| Comes out at a portal you already had | Another portal within 128 blocks of the target | Break the old one, or move this pair further apart |
| A brand-new portal appears in the wall | Nothing existed near the target, so the game built one | Break it, build yours at the exact coordinate, light it |
| Off by one block, west or north of spawn | Truncated instead of floored the negative division | Use the value from the table above |
| Two Overworld portals share one Nether portal | They are closer than 1,024 Overworld blocks | Move one, or hand-build both Nether portals and light them first |
| Arrives far below the expected height | Y clamped under the Nether roof | Build both frames at a similar, valid Y |
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Questions, answered.
How do you calculate Nether portal coordinates?+
Going to the Nether, divide the Overworld X and Z by 8 and keep Y the same. Going back, multiply the Nether X and Z by 8 and keep Y. So an Overworld portal at 800, 64, -400 corresponds to 100, 64, -50 in the Nether. Round down, never toward zero: X -9 becomes -2, not -1.
What is the Nether portal ratio?+
8 to 1 horizontally: one block walked in the Nether covers eight in the Overworld. Vertically it is 1 to 1, so Y is carried across unchanged (clamped to fit the destination). The ratio is identical in Java and Bedrock Edition.
Why does my Nether portal go to the wrong place?+
When you enter a portal the game looks for an existing portal within 128 blocks of the calculated destination and links to that instead of building a new one. If another portal is already inside that radius, it captures your link. Fix it by building the destination portal by hand at the exact coordinates and lighting it before you travel, or by moving one portal further away.
How far apart do Nether portals need to be?+
More than 128 blocks apart in the Nether, which is more than 1,024 blocks apart in the Overworld. Closer than that and their destination targets fall inside the same search radius, so both can end up using one portal.
Does the Y coordinate matter for Nether portals?+
Y is not scaled, but it does decide where you come out. An Overworld portal at Y 200 cannot map to Y 200 in the Nether, because the Nether's playable column ends at the bedrock roof at Y 127, so you arrive lower. Building both portals at a similar Y makes the link predictable.
Is the calculation the same in Bedrock Edition?+
Yes. Bedrock uses the same 8:1 horizontal ratio, the same 1:1 vertical mapping and the same 128-block portal search, so the coordinates this calculator gives work on both editions, and on Realms and any server.
How do I link two Nether portals exactly?+
Calculate the destination coordinate, go there, and build and light the portal yourself before travelling through the first one. A portal that already exists at the target is always preferred over creating a new one, so the pair links permanently as long as no other portal is nearer.
Why do I want a Nether highway?+
Because of the 8:1 ratio: walking 100 blocks in the Nether moves you 800 blocks in the Overworld. Building a tunnel between portal targets in the Nether is the cheapest fast travel in survival Minecraft, and the coordinates to dig between are exactly what this calculator gives you.
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