Minecraft Slime Chunk Finder

Find every slime chunk in your world. Enter your seed for Java, or switch to Bedrock, where slime chunks are the same in every world and need no seed at all.

Move the cursor over the map

How to find slime chunks with your seed

Slime chunks are fixed for the lifetime of a world. Enter your seed once and the green squares show you every chunk where slimes will spawn below Y=40, no matter the light level. That is the whole basis of a slime farm: dig out a chunk-aligned room under Y=40, light the surrounding area so nothing else spawns, and the slimes keep coming.

Click any chunk on the map to pin it. The panel gives you the block range the chunk covers and a /tp command you can paste straight into chat to fly there.

Java and Bedrock work differently

In Java Edition slime chunks come from your world seed combined with the chunk coordinates, so every world has its own layout. In Bedrock Edition the game ignores the seed entirely and derives slime chunks from the chunk coordinates alone. The practical consequence is that every Bedrock world on Earth shares the same slime chunks, so you can find yours without knowing your seed.

Both editions land on roughly 10% of chunks, they just get there by different routes: Java uses the Java standard library random number generator, Bedrock uses a Mersenne Twister.

Building a slime farm

Aim for a chunk that is convenient to reach and sits under a biome you do not mind hollowing out. Slimes need a flat area of at least 3x3 with two blocks of headroom, and they will not spawn within 24 blocks of the player, so build an AFK spot far enough away vertically. Adjacent slime chunks are worth hunting for on this map, since a 2x2 cluster gives you four times the spawn floor in one build.

Frequently asked questions

How do I find slime chunks in Minecraft?
Enter your world seed and the map highlights every slime chunk in green. Slimes spawn in these chunks below Y=40 regardless of light level, which is what makes them the standard spot for a slime farm. Click any chunk to get its exact block range and a ready-to-paste /tp command.

How do I find my world seed?
In Java Edition, run /seed in chat. In Bedrock, open Settings, then Game and the seed is listed at the top of the world options. On a server you may need operator permission, or you can ask an admin.

Why does Bedrock not need a seed?
Because Bedrock does not use the world seed to pick slime chunks. It derives them from the chunk coordinates alone, which means every Bedrock world has an identical slime chunk layout. Switch the toggle to Bedrock and the seed field disappears, because it would change nothing.

What percentage of chunks are slime chunks?
Roughly 1 in 10. Both editions roll a random number from 0 to 9 per chunk and treat 0 as a slime chunk, so about 10% of the map lights up. That holds in Java and Bedrock alike, even though they use different random number generators to get there.

Do slimes spawn anywhere else?
Yes. Slimes also spawn in swamp biomes between Y=50 and Y=70 at night, and that has nothing to do with slime chunks. If you only want a reliable farm, the chunks on this map are the dependable option, since they work at any light level below Y=40.

Does this work for Minecraft Bedrock Edition?
Yes. Use the Java / Bedrock toggle above the map. Be aware the two editions are not interchangeable: since 1.18 they share terrain and biome generation, so the landscape for a given seed looks nearly the same, but structures like villages and strongholds use edition-specific placement and end up in different places. Bedrock also uses 32-bit seeds where Java uses 64-bit.

Is my seed sent to a server?
No. The whole map is computed in your browser with JavaScript. Your seed never leaves your device, there is no account, and no download is necessary.

Can I share a link to what I am looking at?
Yes. The address bar updates as you pan and zoom, so you can copy the URL at any time, or press Copy link. Anyone opening it lands on the same seed at the same position and zoom.

What do the grid lines mean?
The fine grid is chunks (16x16 blocks), which is the unit slime chunks and mob spawning work in. The heavier grid is regions (512x512 blocks, or 32x32 chunks), which is the unit Minecraft uses when deciding where to place structures. Brighter lines through the middle mark the world origin at X=0, Z=0.
Slime Chunk Finder - Minecraft Java & Bedrock Map - Craftapedia