Minecraft Nether portal calculator

The formula

Overworld to Nether: divide X and Z by 8 and round down. Nether to Overworld: multiply X and Z by 8. Y does not change.

Going back multiplies, so the answer is a rough spot, not your exact start. If you were at X 1003, the Nether shows 125. Times 8 is 1000. The 3 blocks are lost when you round down.

Why 8 to 1

One block you walk in the Nether covers 8 blocks of the Overworld. The Nether is a shortcut. A trip of 800 blocks in the Overworld is 100 blocks in the Nether.

Worked example

Your base is at X 400, Y 70, Z -250. Divide X and Z by 8: X 50, Z -32 (-250 / 8 is -31.25, rounded down to -32). Y stays 70. Build the Nether portal near 50 70 -32.

Linking two portals

• Light the Overworld portal and go through. Note your Nether position.
• Use the calculator to find where the matching portal should sit.
• Build the Nether portal at those coordinates, then light it. Both portals now link to each other.
• Place portals more than a few blocks apart. Portals that sit close together can send you to the wrong one.

Common mistakes

• Changing Y. It stays the same, so do not divide it.
• Using a Nether X as the Overworld X. Multiply it by 8 first.
• Building far from the calculated spot. Stay close, or the game may make a new portal instead of using yours.

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