Seed and position
Java Edition — the grid recentres as you type
Chunks around you
29 of 289 visible chunks spawn slimes
Each cell = 1 chunk = 16×16 blocks. The amber outline marks your current chunk.
Opens centred on (0, 0) with the slime-chunk overlay already on.
About slime chunks
Where they spawn, and how to farm them
Below Y=40, slimes only spawn in about 10% of chunks — determined by the world seed and chunk coordinates. The pattern is fixed for the life of the world.
The best slime farm strategy: dig out a 16×16 area at Y=10–25 in a slime chunk, light it with redstone torches (mob spawns avoid them), and AFK 24+ blocks above. Modern farms stack multiple slime chunks for higher rates.
Slimes also spawn in swamp biomes at Y=51–69 on full-moon nights — a different formula, ignored by this tool.
Algorithm: Java Edition Beta 1.5+ formula. Bedrock seeds use a different hash and aren't compatible.
Try these seeds
Documented worlds, for cross-checking against another tool
Each link loads the seed and recenters the grid on chunk (0, 0). Useful for cross-checking against any external slime-chunk tool — the cell pattern should match exactly.
- Default demo seed 3473534097 — Loaded by default when you open this page. Useful as a sanity check that your finder produces the same grid as ours.
- Seed 1 1 — Tiny numeric seed — handy for cross-checking against any other slime-chunk tool, since '1' is unambiguous.
- Seed 0 0 — Vanilla treats seed 0 as a generated random seed in some entry points, but if you literally type 0 the world hashes against the long zero — the slime grid is deterministic.
- Beta → 1.18 panorama seed 2151901553968352745 — Mojang's title-screen seed. Reused in many tutorials, so it's a good reference world for verifying an external tool agrees with our finder.
More world tools
The rest of the set, for the parts of the seed this one doesn't touch
Frequently asked questions
The 10% rule, Bedrock seeds and swamp slimes
How do I find slime chunks in Minecraft? +
Plug your world seed into this finder and look for the green cells in the grid — those are slime chunks. In-game, dig out a 16×16×4 platform at Y=39 or below in any chunk this tool marks green. Light up the surrounding caves to suppress hostile mobs, AFK overnight, and slimes will spawn naturally inside the slime chunk regardless of biome. Bring chunk borders up with F3+G to confirm the chunk you're standing in matches the cx/cz the finder reports.
What percentage of chunks are slime chunks? +
About 10%. The vanilla algorithm hashes (worldSeed, chunkX, chunkZ) into a Java Random and accepts the chunk if random.nextInt(10) == 0, so on average 1 in every 10 chunks is a slime chunk. They're scattered pseudo-randomly with no clustering bias.
Do slime chunks reset between Minecraft versions? +
No. Slime-chunk placement is fully deterministic from the world seed and the chunk's (cx, cz) coordinates. The hashing constants haven't changed since Beta 1.4 — a chunk that's a slime chunk on a given seed in 1.7 is still a slime chunk on the same seed in 1.21. Updating Minecraft will not move them.
What Y-level do slimes spawn in slime chunks? +
Y=39 and below, all the way down to bedrock. Slimes ignore biome and light level inside a slime chunk as long as the spawn space is at least 3×3×2 of solid floor and air, but they still respect the Y ceiling. Y=39 is the safest target because Y=40+ requires a swamp biome (the other place slimes spawn). For best rates, dig out multiple 16×16 floors stacked vertically.
Last verified for Minecraft 26.2