NapNodes
Free tool · Minecraft Java

Chunky pre-generation calculator

Before you run “chunky start”, see how much disk the world will take and how long it will run. Enter the radius and out come the chunks, the GB and the commands to paste into the console, with the world border right where the generated area ends.

Radius in blocks, from 0 0

A radius of 5,000 is a world of 10,000 × 10,000 blocks.

Shape

Your server

What else to generate

Speed (chunks per second)

Chunky shows it when you type “chunky progress”: swap in yours once it has run for a minute. 60 is what a server with one free core manages.

Chunks to generate

390,625

Disk, roughly
2.6–4.1 GB
Time at 60 chunks/s
1 h 49 min

It doesn't fit in the free server's 5 GB. With the Wood plan (15 GB of disk, €6 a month), it does, with room to spare.

Buy Wood

No card for the free server; plans with no commitment.

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

worldborder set 10000

If Chunky says it can't find the world, go into that dimension and type “/chunky world” in chat with nothing else: it picks the world you're in. Or type “/chunky world ” and press Tab to see the names your server uses.

How the numbers work

A chunk is 16 × 16 blocks. Chunky measures the radius from the centre, so a square with a radius of 3,000 is a 6,000 × 6,000-block world: 375 × 375 chunks, about 140,600. As a circle it's 21% fewer.

Each Overworld chunk takes between 7 and 11 KB on disk, depending on the version and the terrain (the figures published by hosts that have measured it: Bloom.host and Lilypad). The End, with its scattered islands, weighs less. That's why the calculator gives a range rather than a single number: you'll see your exact figure in Files when it's done.

Time is what varies most: how much CPU you have free, terrain-generation mods (the ones that add biomes take longer) and whether people are playing. Run it with the server empty and, after a minute, swap the speed for whatever “chunky progress” says.

Before you hit start

  1. Install Chunky: on Paper and Purpur it's a plugin; on Fabric, Forge and NeoForge, a mod. Restart the server.
  2. Check the disk: what you get here plus what your world already takes up. If you run out of space halfway, the server stops.
  3. Paste the commands into the console (without the slash). “chunky pause” stops it and “chunky continue” picks up where it left off.
  4. When it finishes, the border: “worldborder set” with twice the radius, so nobody wanders outside the generated area.

Step by step, with what's worth knowing about each command, in the guide pre-generating the world with Chunky (in Spanish).

Frequently asked questions

How much space does pre-generating a 5,000-block radius take?

A square with a radius of 5,000 is 10,000 × 10,000 blocks, about 390,000 chunks. At 7 to 11 KB per chunk, that's 2.6 to 4.1 GB for the Overworld alone. The Nether and the End come on top.

How long does Chunky take?

It depends on the CPU and the mods. A server with one free core generates in the region of 60 chunks per second, and with several cores, quite a lot more. Chunky tells you its own speed with “chunky progress”: type it into the calculator and you get the real time.

What radius should I use?

For a group of friends, 2,000 to 5,000 blocks is plenty. Every time you double the radius, the disk and the time are multiplied by four: better to start small and expand, since Chunky skips what's already generated.

Why does the Nether use the radius divided by 8?

Because each Nether block is 8 Overworld blocks: with a world of radius 4,000, a radius of 500 in the Nether covers the same ground.

At NapNodes, the start is already done

NapNodes Minecraft servers come with the terrain around spawn already generated, a circle with a radius of 2,000 blocks: the first walks around don't stutter. Chunky skips it, so you only spend time on what you expand. The free server has 5 GB of disk, no card and no end date; each plan, 5 GB for every GB of RAM.

Create your free server

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