Minecraft Slime Chunk Calculator
Find Slime Chunks using the verified 64-bit Java Edition PRNG algorithm with world seed input and an interactive 11×11 chunk radar map.
Uses the verified Java Edition java.util.Random slime chunk formula. Note: Bedrock Edition uses a fixed seed-independent slime chunk layout and is not claimed here.
java.util.Random Slime Chunk algorithm. Slimes spawn in these chunks below Y = 40 regardless of light level. Supports positive and negative chunk and block coordinates.How to Use Minecraft Slime Chunk Calculator
- 01.Enter your Java Edition World Seed (numeric 64-bit integer or text string seed).
- 02.Enter your current Block X/Z or Chunk X/Z coordinates.
- 03.Check whether the target chunk is a Slime Chunk (10% probability) and explore surrounding Slime Chunks on the interactive 11×11 chunk grid.
How It Works
Implements exact 64-bit signed BigInt arithmetic matching Minecraft Java Edition’s WorldgenRandom.seedSlimeChunk and java.util.Random.nextInt(10) == 0.
Supported Formats & Outputs
- • 64-bit Numeric Seed
- • String Seed (Java String.hashCode)
Common Questions about Minecraft Slime Chunk Calculator
At what Y-level do slimes spawn inside a Slime Chunk?
In Slime Chunks, slimes can spawn below Y = 40 regardless of light level.
Does this calculator work for Bedrock Edition?
No. This calculator uses the verified Java Edition seed formula. Bedrock Edition uses a different internal algorithm that ignores the world seed.
Related Minecraft Tools
View all in Minecraft World & Coordinate Tools →
Overworld & Nether Coordinate Converter
Convert X, Y, Z coordinates between the Overworld and the Nether using the exact 8:1 horizontal ratio to link Nether portals accurately.
Minecraft Distance Calculator
Calculate 2D horizontal, 3D Euclidean, Manhattan, and Chebyshev block distances between two coordinates with travel time estimates.
Minecraft Chunk Calculator
Calculate chunk coordinates, local 0–15 block offsets, chunk boundary corners, and Anvil region file names (r.X.Z.mca) from any block position.
Minecraft Seed Map
Explore an interactive 2D Minecraft world seed map with Overworld, Nether, and End biomes, structure candidate locators, Slime Chunks, and 64-bit seed support.