/worldborder set takes the diameter (the square's side); max-world-size in server.properties is a radius. The tool shows both.

Should I pre-generate the world?

It isn't mandatory, but generating chunks while players explore costs CPU. A plugin such as Chunky pre-generates up to the border, preferably outside play hours.

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World border calculator

Compute radius, chunks, regions, pre-generation time, disk space and loaded chunks for your Minecraft world border.

Last updated: 10/9/2026

100% local processing — saved in your browser.

Documentation

Inputs

Diameter (blocks)

Center X

Center Z

View distance (chunks)

Online players

Pre-generation speed (chunks/s)

Estimate: replace with your measurement (Chunky shows its speed).

Average region size (MB)

Estimate: measure the world/region folder of an existing world.

Results

Radius, chunks and regions are exact; time and disk are estimates.

Radius (max-world-size): 5,000
Chunks (side × side = total): 625 × 625 = 390,625
Region files (.mca): 400
Pre-generation (estimate): 1 h 5 min
Disk space (estimate): 19.5 GB
Loaded chunks per player: 441
Loaded chunks (maximum, no overlap): 8,820

Commands

/worldborder center 0 0
/worldborder set 10000
# Chunky: /chunky center 0 0
# Chunky: /chunky radius 5000
# Chunky: /chunky start
# server.properties: max-world-size=5000

Server installation guideNo server yet? Install it locally or on a VPS / dedicated server, ports and firewall included.

How to use World border calculator?

A world border limits terrain generation and therefore the size of the world folder. Enter the desired diameter: the tool gives the radius, the number of chunks (16×16 blocks) and region files (512×512 blocks), the estimated pre-generation time and the /worldborder commands to use.

Enter the border diameter in blocks and its center (0 0 by default).
Enter the view distance and player count to estimate simultaneously loaded chunks.
Adjust the pre-generation speed and average region file size from your own measurements.
Copy the commands: /worldborder center, /worldborder set, then /chunky to pre-generate (Chunky plugin).

Read the full documentation →