Nether travel calculator using your portal's current location. The 3 blue coordinates are: Your portal's current position in the Overworld, your portal's current position in the Nether, and your desired Overworld coordinate.
Tutorials/Nether portals – Official Minecraft Wiki
Portal Calculator — BadWolfMC: An Adult Minecraft Server
Nether Portal Calculator: To build nether hubs and highways in Minecraft
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