Minecraft Nether Portal Calculator

Overworld to Nether: divide X and Z by 8 and round down; Y stays the same. Example: 800, 64, −200 becomes 100, 64, −25.

Build your Nether portal at

(?)

These are planning coordinates; check the destination in-game.

Convert

Have commands on? Teleport there Java

Teleport command

(?)

Command preview only. Change the route edition in the saved route section below.

Linking several portals? Save this one

Selected route

(?)

Save the X/Y/Z you entered above as your chosen or measured entrance. To save the other end, change direction and enter that entrance’s coordinates.

Named portal routes

(?)

Keep named entrance pairs and your own in-game checks. Each route has separate coordinates, edition and manual records. Calculated targets do not establish where a portal will take you.

Manage routes

Route name

World / server (optional)

(?)

At most 30 routes. Names: 80 characters; world/server: 120 characters. New creates an empty route using these names. Saves stay in this browser.

Route edition (changing it resets manual checks)

Saved Overworld entrance

No entrance saved.

Saved Nether entrance

No entrance saved.

Manual construction & round-trip checklist

Check these only after you have done them in your world. This page does not test the game, detect nearby portals, or certify linking or safety.

I built and lit the saved Overworld entrance and checked its surroundings. I built and lit the saved Nether entrance and checked its surroundings. I traveled Overworld → Nether and arrived at the saved Nether entrance. I traveled Nether → Overworld and arrived at the saved Overworld entrance.

Save both entrances to enable the manual checklist.

Copy or review pair notes

Saved entrances, calculated targets & manual checks

Export or import routes

(?)

Files include coordinates and player-entered checks. JSON imports add new routes; they never replace existing ones. Checkmarks are manual records, not a game certificate. Files are processed on this device and coordinates are not placed in sharing URLs.

Import portal JSON (max 256 KB)

Optional: investigate unexpected arrivals

Only your entered candidates and other saved routes with the same non-empty world/server name and edition are compared. Distances include Y. This page does not scan your world or predict the selected portal. Check entry position, portal geometry, edition and nearby portals in-game.

1. Record where you actually arrived

Arrival in Arrival XYZ

2. Add nearby entrances you know about

Candidate name Candidate dimension Candidate XYZ Extra candidates

3. Compare both directions

(?)

Search-range reference: Java 1.16.2+ uses a smaller horizontal search area when traveling to the Nether; Bedrock differs. This comparison shows entered points and distances only, without classifying search eligibility or guaranteeing links.

Overworld → Nether observations

Nether → Overworld observations

(?)

Saved only in this browser on this device; no account or sync. Pair coordinates and checklist entries are not sent to analytics. Local storage details.

Came out at a different portal?

Nearby portals, entry height and portal shape can change where you come out. Record where you arrived to compare it with your saved entrances.

Something not working? Send feedback

Tell us what you were trying to do and where you got stuck. Suggestions are welcome too.

Open email draft

Review and send it in your email app. No email app? Write to support@sealmount.com in your webmail instead.

Screenshots and settings are optional; share only what helps explain the issue. How we handle your message.

About this tool and common questions

Build your Nether portal at

Hi, I’m Monty. Need a hand?