Case 1
- Overworld coordinate (X or Z)
- 800
100.00
Open with these valuesNether Portal Coordinate Calculator
100.00
Result: 100.00One block in the Nether is eight blocks in the Overworld, so divide your Overworld coordinate by 8. Run it once for X and once for Z; the Y height is identical in both dimensions and needs no conversion. Build within a couple of blocks of the result or the game will dig you a new portal somewhere else.
The numbers at a glance
| Overworld coordinate (X or Z) | Result |
|---|---|
| 0.00 | 0.00 |
| 200.00 | 25.00 |
| 400.00 | 50.00 |
| 600.00 | 75.00 |
| 800.00Your value | 100.00 |
| 1,000.00 | 125.00 |
| 1,200.00 | 150.00 |
| 1,400.00 | 175.00 |
| 1,600.00 | 200.00 |
Worked examples
Case 2
- Overworld coordinate (X or Z)
- 1600
200.00
Open with these valuesCase 3
- Overworld coordinate (X or Z)
- -800
-100.00
Open with these valuesHow it's calculated
Nether coordinate = Overworld coordinate ÷ 8
- StepPress F3 in the Overworld and note the X and Z of your portal.
- StepDivide X by 8, then come back and divide Z by 8.
- ResultBuild the Nether portal at those two coordinates, keeping the same Y height.
What this number means
The Nether is a compressed copy of the Overworld: one block of horizontal travel down there covers eight blocks up here. That single ratio is the whole calculation. Divide your Overworld X by 8, then divide your Overworld Z by 8, and you have the spot where the linked portal belongs. 800 becomes 100, 1600 becomes 200, and negatives behave no differently — −800 becomes −100. Only the horizontal axes are scaled, which is why there is no height field on this page at all: Y carries across untouched. What the ratio does not promise is that your two portals will pair up. Step through and the game hunts for an existing portal near the converted coordinates — roughly 16 blocks out on the way in, 128 blocks out on the way back — and if it finds none, it digs a fresh one at a place of its own choosing. That is the usual story behind a carefully planned link that misbehaves: the arithmetic was right and the build was too far off. Rounding is rarely the culprit, since a whole block sits deep inside that search radius. 825.5 divided by 8 is 103.1875, and building at 103 links just as reliably. The payoff is distance: a thousand blocks of tunnel stand in for eight thousand blocks overland.
Height is not converted
Only the horizontal X and Z axes are scaled; the Y height carries over unchanged. In practice you may still pick a different height, to dodge a lava lake or find solid ground.
Run it twice, once per axis
X and Z are the same calculation on different numbers. Divide X by 8, then come back and divide Z by 8.
Build close to the calculated spot
Travelling into the Nether the game searches roughly 16 blocks around the target for an existing portal, and coming back 128 blocks in the Overworld. If it finds none, it digs a fresh portal somewhere else.
Rounding to whole blocks is usually fine
For ordinary bases, round to the nearest block and you stay well inside the search radius. Decimals matter only when portals sit close together and the link has to pick the right one.
Commonly misread
I divide the Y height by eight as well.
Only the horizontal axes are scaled. The height is the same in both dimensions.
Going back from the Nether I divide by eight again.
Going back you multiply by eight. A Nether portal at X 100 lines up with Overworld X 800.
My portal came out somewhere else, so the ratio must be wrong.
The game only looks for an existing portal near the converted position and builds a new one if it finds none. Build within two or three blocks and the link holds.
Reference table
| Overworld X or Z | Nether X or Z |
|---|---|
| -800 | -100 |
| 0 | 0 |
| 8 | 1 |
| 100 | 12.5 |
| 800 | 100 |
| 1600 | 200 |
| 29999984 | 3749998 |
Questions
What is the Overworld to Nether coordinate ratio?
It is 1 to 8: moving one block horizontally in the Nether covers eight blocks of the Overworld. To go from Overworld to Nether you divide by 8, and to go back you multiply by 8.
Does the Y coordinate change between dimensions?
No. Only the horizontal X and Z axes are scaled; height is carried over unchanged. You may still want a different height in practice, to dodge a lava lake or find solid ground.
How do I convert Nether coordinates back to the Overworld?
Multiply instead of dividing: a Nether portal at X 100 lines up with Overworld X 800. It is the same factor of eight, read the other way.
Why are my portals not linking correctly?
The game only looks for an existing portal near the converted position, and builds a fresh one if it finds none. Travelling into the Nether it searches roughly 16 blocks around the target, and coming back it searches 128 blocks in the Overworld. Build within two or three blocks of the calculated spot and the link holds.
Should I round to whole blocks?
For ordinary bases, yes — round to the nearest block and you are well inside the search radius. Decimals only matter when portals sit close together and you need the link to pick the right one.
Why build a Nether highway?
Because 1,000 blocks of tunnel replace 8,000 blocks of overland travel, cutting the distance by seven eighths. On a blue-ice track a boat covers that in a couple of minutes instead of a long sprint through the Overworld.
Sources and last check
Information, not professional advice.