Overworld → Nether
- Input
- 800, 64, -1600
- Expected output
- 100, 64, -200
X (800→100) and Z (-1600→-200) divide by 8; Y (64) stays exactly 64, with no scaling applied at all.
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Nether Portal Coordinates
The Nether works as a scaled-down map shortcut: walking 1 block inside it corresponds to walking 8 blocks in the Overworld, but only horizontally. Knowing exactly which axis scales is what lets you predict where a portal will open on the other side before building it.
X (800→100) and Z (-1600→-200) divide by 8; Y (64) stays exactly 64, with no scaling applied at all.
Multiplying back by 8 recovers the exact original X and Z coordinates, confirming the ratio is reversible when there is no rounding loss.
The command uses `/execute in` to switch dimension and `tp` to place the player at the already-converted coordinates, ready to paste into chat or a command block.
It is a game rule: the Nether is eight times smaller than the Overworld on a horizontal scale. Walking 1 block in the Nether equals walking 8 blocks in the Overworld, which makes the Nether a great shortcut for long journeys. That is why Nether portal hubs cut surface travel time dramatically.
No. The 1:8 ratio only applies to X and Z; Y stays the exact same number on both sides. The most common mistake when calculating portal coordinates is dividing or multiplying Y by accident.
It is the ratio the game uses to link portals and enable fast travel: walking through the Nether, every block covered corresponds to 8 Overworld blocks, drastically cutting the walking distance between two far-apart points.
From Y=0, the bedrock floor, up to Y=128, the bedrock roof, a much smaller range than the Overworld's height. A portal above Y=128 in the Overworld has no possible counterpart on the Nether side.
When the distance between two Nether portals goes past 128 blocks, the game does not treat them as the same pair and generates a new portal instead of reconnecting to the existing one, which usually happens when the origin coordinates were converted incorrectly.
100 64 -25/execute in minecraft:nether run tp @s 100 64 -25Build the return portal in the Nether at these coordinates so it links to your Overworld portal, preventing the game from creating a new one in the wrong place.
Conversion happens locally in the browser; nothing is sent to servers.