Minecraft Slime Chunk Finder

About the Slime Chunk Finder

Slimes only spawn underground in certain chunks, called slime chunks. About 1 in 10 chunks is a slime chunk, and below Y 40 slimes can spawn there at any light level, day or night. A slime chunk finder shows you exactly which chunks those are, so you can build a slime farm or an AFK spot in the right place the first time. The tool uses the same math as the game, so the grid you see matches your world.

What you get on this page:

• Closest slime chunks first: the 12 nearest slime chunks to spawn or any X and Z, with distance and direction
• Java and Bedrock: Java slime chunks follow your seed; Bedrock slime chunks are the same in every world
• Chunk coordinates: the chunk number plus the block coordinates of its center
• Slime layer: a green grid on the seed map so you can spot clusters of slime chunks for a bigger farm

How to Use the Slime Chunk Finder

Step 1: Enter Your Seed

On Java, type /seed in chat and paste the number. On a server, ask the server admin. On Bedrock you can skip this step, because slime chunks don’t depend on the seed.

Step 2: Pick Java or Bedrock

Switch the edition to match your game. The two editions use different slime chunk formulas.

Step 3: Choose Where to Search

Leave Search from blank to search around spawn, or type the X and Z of your base. Press F3 on Java (or turn on Show Coordinates on Bedrock) to read your position.

Step 4: Find Slime Chunks

Press Find slime chunks. The list shows each chunk’s coordinates, the block center, the distance, and the direction. Press Map to fly there, or /tp to copy a teleport command. Drag the map to scan the green grid around your base.

How Slime Chunks Work

The Java Slime Chunk Formula

On Java Edition, a pseudo-random formula combines the world seed with the chunk coordinates. Each chunk has a 10% chance to qualify, and the result is deterministic, so the same seed always gives the same slime chunks. The formula hasn’t changed since the Beta days, so slime chunk coordinates stay valid across updates.

Bedrock Slime Chunks

On Bedrock Edition, slime chunks depend only on the chunk coordinates, not the seed. Every Bedrock world has the same slime chunks, so a Bedrock slime chunk map works for every seed. That’s also why a slime chunk finder without seed input works on Bedrock.

Where Slimes Spawn

Slimes spawn in slime chunks below Y 40, at any light level, in almost every biome (mushroom fields and the deep dark don’t spawn mobs). They need a solid, opaque floor block and enough space: about 2.1 blocks for big slimes and 3 full blocks of clearance is safest. Bottom slabs, glass, and carpets block spawns.

They also follow the normal mob spawning distance rules:

• Inside 24 blocks of the player, nothing spawns.
• Past 128 blocks, slimes despawn right away.
• Between 24 and 128 blocks, the slime chunk is active.

Slime Chunks vs Swamp Spawning

Slimes also spawn on the surface in swamps and mangrove swamps, between Y 51 and Y 69, at a light level of 7 or less. Swamp spawning follows the moon: lots of slimes on a full moon, none on a new moon. Slime chunks work 24/7 below Y 40, which makes them better for farms.

Building a Slime Farm

Pick a cluster of slime chunks near your base with the finder, clear them out below Y 40, and build flat floors with 3 blocks of space. A full step-by-step farm guide is coming to the site soon.

Minecraft Slime Chunk Finder Java

The Java finder works for every version from 1.7 to the latest release, including 1.21 and 1.21.11, because the formula hasn’t changed. You only need the seed.

Minecraft Slime Chunk Finder Bedrock

The Bedrock finder works for every version and every world, since Bedrock slime chunks ignore the seed. Pick Bedrock, enter any seed, and the grid is correct for your world.

Slime Chunk Finder Without Seed

On Bedrock you don’t need a seed at all. On Java you need it. Without the seed, the only option is testing in game: dig a room below Y 40, light it up, and wait. If slimes appear, you’re in a slime chunk. It’s slow, and slimes have a low spawn rate, so give it time.

Slime Chunk Finder Mod

You don’t need a mod or a resource pack. This finder runs in your browser with no install. Slime chunk finder mods add an in-game overlay, but they must match your game version, and any mod that changes world generation can change the result.

Common Mistakes

• Wrong edition: Java and Bedrock slime chunks are completely different.
• Wrong seed: check for missing digits and the minus sign.
• Building too high: slimes in slime chunks only spawn below Y 40.
• AFK too close: nothing spawns within 24 blocks of you.
• Not waiting: spawn rates are low even in slime chunks.

Credits

Slime chunk math follows the game’s own formula: Java uses the seed and chunk coordinates, and Bedrock uses chunk coordinates only. 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
• Seed Finder: Find seeds by structures & biomes