Slime Chunk Finder
Edition
Version
Seed
About one chunk in ten is a slime chunk: slimes can spawn there below Y 40 at any light level, which is what a slime farm needs. Which chunks they are depends only on the seed.
No. Bedrock picks slime chunks by a different rule that ignores the seed, so pick your edition before you dig.
On Java Edition, type /seed in chat (it needs cheats on, or operator rights on a server). On Bedrock, open the world's settings: the seed is listed under Game.