How Nether Portals Link and How to Fix Bad Links

Nether portals are the fastest way to travel in Minecraft. Every block you walk in the Nether covers 8 blocks in the Overworld. But portals can also be frustrating. You build one, step through, and end up somewhere you did not expect.

This guide explains how nether portals link, so you can build networks that always go where you want. To skip the math, use the nether portal calculator to get the exact coordinates for your second portal.

Open the nether portal calculator

The 8:1 rule

The Nether is scaled down compared to the Overworld. Horizontal distances are divided by 8.

• Overworld to Nether: divide X and Z by 8.
• Nether to Overworld: multiply X and Z by 8.
• Y is not scaled. Height stays the same, although the game will move you to a valid height.

So a 1,000-block trip in the Overworld is only 125 blocks in the Nether. That is why players use it for long-distance travel.

How the game picks a destination portal

When you step into a portal, the game works out the matching coordinates in the other dimension. Then it looks for an existing portal near that spot.

• Going into the Overworld, it searches up to about 128 blocks from the target in X and Z.
• Going into the Nether, it searches up to about 16 blocks, since 16 Nether blocks equal 128 Overworld blocks.
• If it finds one or more portals, it sends you to the closest one.
• If it finds none, it builds a new portal near the target.

This is the key to everything. Portals do not remember a partner. Each trip is a fresh search for the nearest portal. So adding a new portal can change where an old one leads. It also explains why two portals can link one way but not the other. The search from each side is separate, and each side may find a different closest portal.

When the game makes a new portal

If no portal is in range, the game creates one. It looks for a flat, open space near the target, big enough for the frame. If it cannot find one, it builds the portal anyway and places a small obsidian platform so you do not fall.

This is how players end up in a portal floating over lava or buried inside a wall. The game picked the best spot it could, not a good spot. It is also why random Nether portals can link back to the wrong Overworld base.

The fix is to build the second portal yourself instead of letting the game do it.

How to link two portals correctly

1. Build your Overworld portal and stand inside it. Note its X, Y and Z with F3 in Java or Show Coordinates in Bedrock.
2. Divide X and Z by 8. Keep Y about the same, as long as it fits in the Nether.
3. Go through. If the game created a new portal, walk or dig to the exact coordinates you calculated.
4. Build a portal right there and light it.
5. Break the auto-generated portal if it is close by, so it does not steal the link.
6. Test both directions.

The calculator handles step 2, including negative coordinates.

Stay below Y 128 in the Nether. The bedrock roof is at Y 128, and portals built above it link back to the same messy spots.

Why portals link to the wrong place

• Two Overworld portals are too close. If they are less than about 128 blocks apart, their Nether targets are only 16 blocks apart. Both may link to the same Nether portal.
• The Nether portal is not at the right spot. If you built it by guesswork, the Overworld search may find a different portal first.
• An old auto-generated portal is closer. Break unused portals so they do not get picked.
• The Y level is very different. Distance counts height too, so a portal at the same X and Z but a very different Y can lose to a closer one.

A good rule: in the Nether, put each portal at its exact divided coordinates, and keep different Nether portals more than a few blocks apart.

Java and Bedrock differences and other tips

The 8:1 rule is the same on both editions. The search details are a little different, and Bedrock can be pickier about matching portals. On Bedrock, building both portals at exact coordinates is even more important.

More tips:

• The smallest frame is 4 wide and 5 tall, using 10 obsidian if you skip the corners. The largest is 23 by 23.
• Use the Nether to reach far-off structures quickly. Plan routes with the nether fortress finder and bastion finder.
• Build a tunnel at Y 15 or so, and you will spot ancient debris on the way.

Building a Nether hub

Once you understand how portals link, you can build a Nether hub. This is a central spot in the Nether with tunnels leading to portals for all your Overworld locations.

1. Pick a central Overworld base and build its portal. Link the Nether side at the exact divided coordinates.
2. For each other place you want to reach, such as a village or a mansion, take its Overworld X and Z and divide by 8.
3. Dig or build a tunnel in the Nether from your hub to that spot.
4. Build a Nether portal there and light it. It creates a matching Overworld portal near the target, or links to one you have already built.

Many players build their main tunnels at Y 15 or so for ancient debris, or on the Nether roof in Java for safe travel. Remember that roof portals can behave oddly, so test them carefully.

Ice roads make tunnels even faster. Boats on blue ice move very fast, and the Nether's 8:1 scale multiplies that speed for Overworld distance.

Keep your tunnels safe. Ghasts can blow holes in walls, so use cobblestone or other blast-resistant blocks. Mark each tunnel with a sign showing where it goes. Within a short time you can reach places thousands of blocks away in a minute or two.

When you find a new target on the seed map, just add one more tunnel and portal to your hub.

FAQ