FreeSeedFinderMinecraft Slime Chunk Finder (Java Edition)
Enter your Java Edition seed and this tool draws the slime chunks around any coordinates, so you can pick a spot for a slime farm without digging for hours. It also lists the nearest slime chunks and the densest group of chunks in view. Everything is calculated in your browser.
Slime chunk Centre chunk Densest 3 by 3 area Selected chunk. The example seed 12345 is only a placeholder.
What is a slime chunk?
A slime chunk is a 16 by 16 column of the world where slimes can spawn underground, and about one chunk in ten is one. In Java Edition, slimes spawn in slime chunks below Y=40 whatever the light level, except in mushroom fields and the deep dark. Slimes also need open space to spawn, and swamps have their own spawn rules.
Java Edition decides which chunks are slime chunks from the world seed and the chunk coordinates, so the same seed always gives the same pattern. That is why you can predict them from a seed without visiting the area.
How to use the slime chunk finder
- Enter your seed. Run
/seedin game, or read it with our world file seed reader if you cannot open the world. - Enter the X and Z block coordinates where you want to look, such as your base or spawn.
- Choose a map size and press Show slime chunks.
- Select a green square to see its chunk and block coordinates, then use the arrow buttons to move the map in steps of 128 blocks.
If you use text instead of a number, the tool converts it exactly as the game does, as explained in our text to seed converter. Not sure where your seed is stored? Our guide on finding your Minecraft seed covers every method. To pick the best place for a farm, read our slime farm location guide.
Converting coordinates to chunks
To turn a world coordinate into a chunk coordinate, divide by 16 and round down. Block X=-5 is in chunk -1, and block X=20 is in chunk 1. A chunk with number 3 covers blocks 48 to 63. The tool shows these ranges for every chunk you select, so you can mark the edges of a farm area.
How the calculation works
The tool follows the Java Edition formula documented on the Minecraft Wiki. It mixes the seed with the chunk coordinates, uses the result to start Java's random number generator, and calls the chunk a slime chunk when the first number drawn from 0 to 9 is 0.
new Random(seed
+ (int) (x * x * 0x4c1906)
+ (int) (x * 0x5ac0db)
+ (int) (z * z) * 0x4307a7L
+ (int) (z * 0x5f24f) ^ 0x3ad8025f
).nextInt(10) == 0We checked our version of the random number generator against known Java outputs and against a second, independent implementation across tens of thousands of chunks. About 10 percent of chunks come out as slime chunks, as expected.
Java and Bedrock are different
This tool is for Java Edition. Bedrock Edition uses a different algorithm that does not depend on the world seed, so its slime chunks are in the same places in every world. A Java seed therefore tells you nothing about Bedrock slime chunks.
If your results do not match the game
- Check the seed first. One wrong digit changes every chunk, and a negative seed needs its minus sign.
- Check that you are playing Java Edition and not Bedrock.
- Check your chunk maths. Round down, not towards zero, for negative coordinates.
Frequently asked questions
How do I find slime chunks in Minecraft Java?
Enter your seed and the coordinates you want to check. The finder marks every slime chunk on the map and lists the nearest ones, with the block range of each. You can then dig down below Y=40 in a marked chunk.
Do slime chunks depend on the seed?
In Java Edition, yes. The game calculates them from the world seed and the chunk coordinates, so every seed has its own pattern. In Bedrock Edition they do not depend on the seed and are the same in every world.
At what height do slimes spawn in slime chunks?
Below Y=40, regardless of light level, except in mushroom fields and the deep dark. Swamps have separate spawn rules, so check the Minecraft Wiki before building a swamp farm.
What share of chunks are slime chunks?
About one in ten. Our checks on large areas show roughly 10 percent, which matches the Minecraft Wiki.
Does the game version or world type change slime chunks?
According to the documented Java formula, only the seed and chunk coordinates matter, so version and world type do not change the pattern. If your world still disagrees, recheck the seed.