Minecraft Chunk Calculator (Java & Bedrock)
A chunk is 16×16 blocks, so divide X and Z by 16 and round down. Block 250, -1300 is in chunk 15, -82, inside region file r.0.-3.mca.
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This block is in chunk
15, -82
| Chunk | 15, -82 |
|---|---|
| Position inside the chunk | 10, 12 (each 0–15) |
| Chunk starts at (north-west corner) | X 240, Z -1312 |
| Chunk ends at (south-east corner) | X 255, Z -1297 |
| Region | 0, -3 |
| Region file (Java) | r.0.-3.mca |
| Bedrock | Same chunk numbers; worlds are stored in a database, not region files |
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Example coordinates
| Block X, Z | Chunk | Region file |
|---|---|---|
| 0, 0 | 0, 0 | r.0.0.mca |
| 15, 15 | 0, 0 | r.0.0.mca |
| 16, -1 | 1, -1 | r.0.-1.mca |
| 250, -1,300 | 15, -82 | r.0.-3.mca |
| -513, 512 | -33, 32 | r.-2.1.mca |
| 1,000, 1,000 | 62, 62 | r.1.1.mca |
| -10,000, 4,096 | -625, 256 | r.-20.8.mca |
How to use it
- Press F3 (Java) or turn on Show Coordinates (Bedrock) and read your X and Z.
- Type them in. The chunk number appears instantly.
- Use the chunk corners to line up farms, slime-chunk builds or chunk-border walls.
- Server admins: the region file tells you which file in world/region holds that area (Java).
How it works
Chunk = floor(coordinate ÷ 16). The position inside the chunk is the remainder, from 0 to 15, even for negative coordinates. A region is 32×32 chunks, so region = floor(chunk ÷ 32). Java worlds store each region in a file named r.X.Z.mca.
Questions
How big is a Minecraft chunk?
16 blocks wide and 16 blocks long, running from the bottom of the world to the top.
How do I see chunk borders in game?
In Java, press F3 + G to show chunk borders. Bedrock has no built-in chunk border view, so use this calculator with Show Coordinates.
Why are negative coordinates different?
Rounding down means -1 is in chunk -1, not chunk 0. The calculator handles this for you, matching what the F3 screen shows.
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By PickaxeKit Editorial Team. Updated 2026-11-09.