FreeSeedFinderNether Portal Calculator and Link Checker
This calculator converts coordinates between the Overworld and the Nether, and checks whether two portals are far enough apart to link to different partners. It follows the linking rules in the Minecraft Wiki for Java and Bedrock. Everything runs in your browser.
Coordinate converter
Portal link checker
How to convert Overworld and Nether coordinates
One block in the Nether equals eight blocks in the Overworld on the X and Z axes. To go from the Overworld to the Nether, divide X and Z by 8 and round down. To go the other way, multiply by 8. The Y coordinate does not change. An Overworld portal at X 344, Z -1290 matches a Nether portal at X 43, Z -162.
Round down means towards negative numbers, so an Overworld X of -1 becomes -1 in the Nether, not 0. Going back, one Nether block covers eight Overworld blocks, which is why the converter shows a range for Nether to Overworld results.
| Nether distance | Overworld distance |
|---|---|
| 1 | 8 |
| 16 | 128 |
| 128 | 1,024 |
| 1,000 | 8,000 |
How portal linking works
When you enter a portal, the game converts your position, then looks for an active portal near that point in the other dimension. If it finds one, you arrive there. If it finds none, it builds a new portal at the nearest suitable spot, within 16 blocks horizontally of the destination. A portal frame must be at least 4 by 5 blocks and at most 23 by 23.
| Edition | Search radius, Overworld | Search radius, Nether |
|---|---|---|
| Java 1.16.2 and later | 128 blocks | 16 blocks |
| Java 1.16.1 and earlier | 128 blocks | 128 blocks |
| Bedrock Edition | 128 blocks | 128 blocks |
Java 1.16.2 reduced the Nether radius from 128 to 16 blocks so that it matches the 1:8 scale: 16 Nether blocks cover the same ground as 128 Overworld blocks. Bedrock still searches 128 blocks in both dimensions, which is why its portals are far more likely to link to the wrong partner. Guides quote different numbers, so we follow the Minecraft Wiki.
How to link two portals exactly
- Read the coordinates of your Overworld portal. In Java Edition press F3; in Bedrock Edition turn on Show Coordinates in the world settings.
- Convert them with the calculator and build the Nether portal at the result.
- Check the pair with the link checker, using the other portals you already own.
- Walk through both ways to confirm that each side leads to the portal you meant.
How the link checker works
The checker converts both portals to Nether coordinates when you enter Overworld coordinates, then measures the distance between them along the larger axis. If that distance is inside your edition's Nether search radius, one portal can capture the other's partner. If it is only a little outside, the tool warns you, because the game searches by chunks and the edge of the range is not exact. For Java, keep portals roughly 150 blocks apart in the Overworld, or more.
Common mistakes
- Entering Nether coordinates as Overworld ones, or the reverse. Check the direction setting first.
- Building several Overworld portals close together. They convert to nearby Nether spots and share one portal.
- Trusting a guess instead of reading coordinates. Use the in-game coordinate display.
- Using Java numbers on Bedrock. Bedrock's Nether search is eight times wider in Overworld terms.
Frequently asked questions
How do I convert Overworld coordinates to Nether coordinates?
Divide the X and Z coordinates by 8 and round down. Y stays the same. For example, Overworld X 344, Z -1290 becomes Nether X 43, Z -162. To go back, multiply the Nether X and Z by 8.
How close can two portals be before they link to the same portal?
On Java 1.16.2 and later, Nether portals within 16 blocks of the converted spot can be found, which is 128 blocks in the Overworld. On Bedrock the Nether search is 128 blocks, about 1,024 Overworld blocks. Leave extra margin beyond these numbers.
Does the Y coordinate change between the Overworld and the Nether?
No. Only X and Z are scaled by 8. If no portal exists, the game places a new one near the destination, and it may move vertically to find a suitable spot.
Why did my portal take me to a different place than I built?
Another portal was probably closer to the converted point and inside the search radius. Move one of the portals, or build both sides by hand at converted coordinates and check them with the link checker.
Does this calculator work for Bedrock Edition?
Yes. The 8 to 1 scale is the same in both editions. The checker has a Bedrock setting because Bedrock searches 128 blocks in both dimensions, so portals must be much further apart.