BLOCK ↔ CHUNK · REGION FILES
Minecraft Chunk Calculator
Type any block coordinates and this Minecraft chunk calculator shows the chunk they’re in, the position inside the chunk, the chunk’s block range, and the region file. It works the other way too, from chunk to blocks.
Runs in your browser. Nothing to download, and no seed needed.
More Minecraft finders
Village Finder
Find the closest villages to spawn for an easy first night.
Biome Finder
Find cherry groves, mushroom fields and the deep dark.
Slime Chunk Finder
Spot slime chunks below Y=40 for farms, Java and Bedrock.
Stronghold Finder
See every stronghold ring, so you need fewer Eyes of Ender.
Ancient City Finder
Locate deep dark cities and plan a quiet route in.
Nether & End
Fortresses, bastions, end cities and end gateways.
Seed Finder
Search for seeds with a village and a rare biome near spawn.
3D Seed Viewer
Rotate mountains and valleys around any spot on your seed.
About the Chunk Calculator
Minecraft splits every world into chunks of 16×16 blocks. Slime chunks, spawn chunks, chunk borders for farms, and world file edits all depend on knowing which chunk you’re in. Chunk math is easy to get wrong with negative numbers, so a chunk calculator does it for you.
What you get on this page:
- Block → chunk: chunk X and Z, plus the block position inside the chunk
- Chunk → blocks: the X and Z range a chunk covers
- Region file: the r.X.Z.mca file that stores the chunk
- Chunk center: with a /tp command
How to Use the Chunk Calculator
Step 1: Read Your Coordinates
Press F3 on Java to see your block X and Z. F3 also shows the chunk directly, so you can double-check. On Bedrock, use Show Coordinates.
Step 2: Pick a Mode
Choose Block → Chunk to find the chunk you’re standing in, or Chunk → Blocks to see a chunk’s range.
Step 3: Enter X and Z
The results update as you type.
How Chunk Coordinates Work
| Value | Formula |
|---|---|
| Chunk X | floor(block X ÷ 16) |
| Chunk Z | floor(block Z ÷ 16) |
| Block inside chunk | block X − chunk X × 16 (0 to 15) |
| Region X, Z | floor(chunk ÷ 32) |
| Region file | r.regionX.regionZ.mca |
Negative numbers round down, not toward zero. Block X -1 is in chunk -1, not chunk 0. That’s the most common mistake.
Examples
| Block X, Z | Chunk | Region file |
|---|---|---|
| 0, 0 | 0, 0 | r.0.0.mca |
| 1,208, -360 | 75, -23 | r.2.-1.mca |
| -1, -1 | -1, -1 | r.-1.-1.mca |
Why Chunks Matter
- Slime chunks: slimes spawn in specific chunks below Y 40. Use the slime chunk finder to see them.
- Farms: keep farms inside one chunk, or line them up with chunk borders.
- Spawn chunks: chunks near world spawn can stay loaded in Java.
- World editing: region files hold 32×32 chunks each.
Show Chunk Borders
On Java, press F3+G to show chunk borders in the world. On Bedrock, there’s no built-in chunk border view, so use the calculator.
Minecraft Chunk Calculator Bedrock
Chunk math is the same on Bedrock: 16×16 blocks per chunk. Region files are a Java format, so ignore them on Bedrock.
Credits
The calculator runs entirely in your browser. This is not an official Minecraft product. We’re not affiliated with, approved by, or associated with Mojang or Microsoft.
Related Minecraft Tools
These tools pair well with this one:
- Minecraft Seed Map: the full map with every biome and structure
- Slime Chunk Finder: Slime chunks for Java & Bedrock
- Nether Portal Calculator: Overworld to Nether coordinates
- Stronghold Calculator: Find it with two Eye of Ender throws
Frequently Asked Questions
How big is a chunk in Minecraft?
16 blocks wide, 16 blocks long, and the full height of the world.
How do I find what chunk I’m in?
Press F3 on Java and read the “Chunk” line, or type your coordinates into the calculator.
How many chunks are in a region file?
32×32 chunks, or 1,024 chunks per file.
Does it work on Bedrock?
Yes, for chunks. Region files are Java only.
Final Thoughts
A chunk calculator takes the guesswork out of chunk borders, slime chunks, and region files. Type your coordinates and read the chunk, its range, and the file it lives in.
