Free server tool / World preparation

Map out the work. Before players explore.

Choose a world area, estimate the chunks ahead, and prepare the commands to generate it. Add a measured rate to see what the job could take.

Square & circle selectionsChunky commandsShare your setup

01 / Choose the area

Generate the world before the adventure.

Plan one dimension at a time. Radius is the distance from the center to the edge, in blocks.

World nameSelection shapeRadius (blocks)

Center XCenter Z

Area already generated (%)Your estimate of how much of this area already exists. It affects the remaining-work calculation, not the command selection.

Bring your own measurements

Run a small test in this world first. Leave these at 0 if unknown; generation speed and chunk size vary too much to guess.

Measured generation rate (chunks/second)Measured disk size (KiB/chunk)Divide a representative test’s added disk usage in KiB by its newly generated chunks. Excludes backups.

02 / Scope the work

390,625

approximate chunks in the selection

Full width / diameter: 10,000 blocks
Estimated new chunks: 390,625
Time at your measured rate: Enter a rate
Additional terrain storage: Enter a chunk size

Area ÷ 256, rounded up. Chunk alignment and boundary handling affect the exact count. Time assumes a constant rate; disk excludes backups, logs and future world growth.

Your Chunky commands

chunky world world
chunky shape square
chunky center 0 0
chunky radius 5000
chunky start

Run each line in your server console after installing Chunky. In-game, prefix each with /. Confirm the world and available disk first. This website does not run commands on your server.

Start with a small sample

Test terrain from the same seed, dimension and generator. Use its chunk rate and disk growth above to get an estimate tied to your own server.

Choose a quiet period

Generation competes with players for resources. Watch disk and tick time while it runs; chunky pause pauses the task, and chunky continue resumes it.

Keep the boundary clear

A Chunky selection is a generation area, not a player movement limit. Configure a world border separately if you want players to stay inside it.

Command reference: Chunky documentation.

A little help before you launch

Before you generate the world.

How the estimate works, and how to apply the commands.

Let’s talk it through.

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5 questions

01Is the chunk count exact?

No. The planner divides the selection’s area by 256 blocks per chunk and rounds up. Exact counts depend on chunk alignment and how the generator includes boundary chunks. It is a scale estimate, not a count read from your world.

02Why are time and storage blank at first?

They require measurements from your own world. A small generation test gives you a representative chunks-per-second rate and disk growth per chunk. Terrain, mods, hardware and existing chunks can change both.

03Does this run anything on my server?

No. Copy the generated commands into your console after installing Chunky and reviewing the target world. The final command starts generation. Use chunky pause to pause and chunky continue to resume.

04Does the selection create a world border?

No. It selects the area Chunky should generate. Configure your movement boundary separately if you want players to stay within that region.

05Can I use it for the Nether or End?

Yes. Select the actual loaded world name and appropriate radius for that dimension, and measure that dimension separately. This tool does not convert radii between dimensions.

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