Calculator
Slime Chunk Finder
Type a world seed to see the slime chunks around you, the nearest ones and the best spot to wait for a slime farm.
The number /seed shows, or what was typed when the world was made: the game turns words into a number.
Your position (F3 screen)
Type the world's seed to see its slime chunks.
Slimes in swamps by moon phase
| 1 | Full moon | 50% |
| 2 | Waning gibbous | 37.5% |
| 3 | Third quarter | 25% |
| 4 | Waning crescent | 12.5% |
| 5 | New moon | 0% |
| 6 | Waxing crescent | 12.5% |
| 7 | First quarter | 25% |
| 8 | Waxing gibbous | 37.5% |
Where slimes spawn
| Slime chunks, in every Overworld biome but Deep Dark and Mushroom Fields | Below Y 40 | Any light |
| Swamp, Mangrove Swamp | Y 51 to 69 | Light (block or sky, whichever is higher) at most a random 0 to 7 |
How the game works it out
| Slime chunk | One chunk in ten, picked from the world seed and the chunk's position; the same seed always gives the same chunks |
| Spawn attempts | In a slime chunk only one spawn attempt in ten goes ahead, below Y 40, in any light |
| Biomes | Deep Dark and Mushroom Fields spawn no slimes, slime chunk or not |
| Swamps | Swamp and Mangrove Swamp also spawn slimes from Y 51 to 69, more often near a full moon and never at a new moon; the moon cycle is 8 nights |
| Distance | Nothing spawns within 24 blocks of a player; slimes more than 128 blocks from every player vanish at once |
| Peaceful | No slimes spawn in Peaceful difficulty |
| Text seeds | A seed typed as words becomes a number the way the game reads it; /seed shows that number |
| Checked against the game | The finder gives the same slime chunks as the game for 49 seeds and over 117,000 chunks |
