Spawn Calculator
Check whether hostile mobs can spawn at a block light level, and the spawn-proof threshold.
Result
Hostile mobs CAN spawn here
- Spawns at block light ≤ 0
- Spawn-proof at block light ≥ 1
- Spawn surface must be an opaque, full solid block (top face).
- Enough air space above (2 blocks for most mobs).
- Within world height (Overworld −64 to 320).
- Only block light matters — sky light does not stop night spawns.
Block light 0 (java): hostile mobs CAN spawn. Reach light ≥ 1 to spawn-proof.