Stronghold Finder
Throw an Eye of Ender, line your crosshair up with it, and write down your X, Z, and facing angle from the F3 screen. Walk a few hundred blocks sideways, throw again, and enter both readings below.
The angle is the first number in the F3 “Facing” line, e.g. Facing: north (Towards negative Z) (-123.4 / 2.6) → enter -123.4.
Estimated stronghold location
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Fill in both throws to triangulate.
Nether route (÷8)
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How it works: each throw defines a line from where you stood, pointing the way the eye flew. The calculator finds where those two lines cross. For a clean crossing, make your second throw from a spot well off the first line — 300 to 800 blocks to the side works great. Dig down to around Y 30–40 near the result and search for the portal room.