Minecraft Nether Portal Calculator

Convert Overworld and Nether coordinates (X and Z ÷ 8 or × 8) and see exactly where to build the linked portal, with Java and Bedrock search ranges and saved portal pairs.

Edition

Your coordinates are in the

Overworld X

Overworld Y

Overworld Z

Use the numbers from F3 (Java) or Show Coordinates (Bedrock). Decimals are rounded down to the block you're standing in.

Build the Nether portal at

Nether X

100

Nether Y

Nether Z

-30

X and Z are divided by 8 and rounded down; Y stays the same. Stand at X 100, Z -30 in the Nether and build the portal there, facing the same way as your Overworld portal. In Java Edition, the game looks for an existing portal within 16 blocks of this point in the Nether, so a portal built here links even if it's a few blocks off.

Portal rules: Java vs Bedrock

Rule	Java	Bedrock
Search radius arriving in the Nether	16 blocks	128 blocks
Search radius arriving in the Overworld	128 blocks	128 blocks
Nether build height	Y 0 to 255 (roof at 127)	Y 0 to 127
Overworld build height	Y -64 to 319 in both
If no portal is found	A new one is built at the nearest open spot within 16 blocks horizontally (any height)
Frame size	4×5 to 23×23 obsidian, corners optional

The search covers a square around the converted point and the full world height, and picks the closest portal in a straight line, counting height. A portal far above or below can lose to one that's further away sideways.

Saved portal pairs

Saved in this browser only. Each pair is checked against all your saved portals for Java Edition.

Name for this pair

No saved portals yet. Save the pair above to keep track of your network.

Rules from the Minecraft Wiki's Nether Portal page, checked for Java Edition 26.3 and Bedrock Edition 26.63. Link checks treat each portal as one block, so a portal right at the edge of the search area may behave differently in game.

NOT AN OFFICIAL MINECRAFT PRODUCT. NOT APPROVED BY OR ASSOCIATED WITH MOJANG OR MICROSOFT.

How the Minecraft Nether Portal Calculator works

Converts Minecraft coordinates between the Overworld and the Nether and tells you where to build the matching portal so the two link. It covers Java and Bedrock Edition, explains the portal search range for each, and can save your portal pairs in this browser and check that each one links to its partner.

Choose Java or Bedrock, then say whether your coordinates are in the Overworld or the Nether.
Type the X, Y and Z from your F3 screen (Java) or Show Coordinates (Bedrock). Negative numbers and decimals are fine.
Read the result: build the other portal at those coordinates, facing the same way as the first. Use Swap to convert back.
Optionally name the pair and press Save current pair. Each saved pair shows whether its portals link to each other or to another saved portal.

The conversion

The Nether is scaled 1:8 horizontally. Going to the Nether, X and Z are divided by 8 and rounded down; coming back, they're multiplied by 8. Y is never scaled. So Overworld 800, 64, -240 becomes Nether 100, 64, -30. Rounding down applies to negative numbers too: Overworld X -9 becomes Nether X -2, not -1.

How portals find each other

When you go through a portal, the game converts your position and looks for an existing portal around that point, over the full world height. In Java Edition it searches 16 blocks in each direction in the Nether and 128 blocks in the Overworld. In Bedrock Edition it searches 128 blocks in both. If several portals are in range, the closest one in a straight line wins, and height counts, so a portal far below can lose to one further away sideways. If none is found, the game builds a new portal at the nearest open spot within 16 blocks horizontally.

The saved-pair check applies these rules to the portals you've saved, treating each portal as one block. Portals you haven't saved, and portals right at the edge of the search area, can still change what happens in game.

Sources

Rules and heights come from the Minecraft Wiki's Nether Portal, Altitude and The Nether pages, checked for Java Edition 26.3 and Bedrock Edition 26.63. This tool is not an official Minecraft product and is not approved by or associated with Mojang or Microsoft.

Frequently asked questions

How do I calculate Nether coordinates?

Divide your Overworld X and Z by 8 and round down; keep Y the same. Overworld 1000, 70, -500 becomes Nether 125, 70, -63 (because -500 ÷ 8 = -62.5, which rounds down to -63). To go the other way, multiply the Nether X and Z by 8.

Where should I build my Nether portal so it links?

Build it at the converted coordinates in the other dimension, facing the same way as the first portal. In Java Edition, a Nether portal must be within 16 blocks of the converted point (and closer than any other portal) for an Overworld portal to use it. Going back, the game searches 128 blocks, so place Overworld portals that should stay separate well apart.

Why does my portal link to the wrong portal?

The game picks the closest portal to the converted point in a straight line, height included. If another portal is closer, even one you built for somewhere else, you'll come out there. Two Overworld portals less than about 128 blocks apart can also share one Nether portal. Save your pairs in the tool to see which portal each one is predicted to reach.

Is the Nether portal search radius different in Bedrock?

Yes. Java Edition searches 16 blocks in the Nether and 128 in the Overworld. Bedrock Edition searches 128 blocks in both, so Bedrock Nether portals need to be spaced much further apart to stay separate.

Does Y matter for Nether portals?

Y isn't scaled, but it still counts when the game picks the closest portal. Build heights also differ: the Overworld runs from Y -64 to 319 in both editions. The Nether runs from Y 0 to 255 in Java Edition, with the bedrock roof at 127, and from 0 to 127 in Bedrock Edition. The tool warns you when a Y is outside those limits.

Are my saved portals uploaded anywhere?

No. Saved pairs and your edition choice are kept in this browser's local storage and never leave your device. Clearing site data removes them.

Similar Gaming tools

3 related

Finance

Tip Calculator

Calculate the tip, optional tax and fees, and what each person owes when splitting the bill.

Health

BMI Calculator

Calculate your Body Mass Index (BMI) from your height and weight and see its category.

Utility

Date Difference Calculator

Calculate the difference between two dates in days, weeks, months, or years with our Date Difference Calculator. Perfect for planning events and schedules.