OSRS Slayer task optimizer
See the real probability of every Slayer task from each of the eight Slayer masters. Enter your combat and Slayer levels and the tool shows each task's chance — its assignment weight divided by the total weight of your eligible pool — and how blocking tasks or unlocking point tasks shifts your odds.
Frequently asked questions
How are Slayer task odds calculated?
Each task a master can give has an assignment weight. Your chance of a specific task is its weight divided by the summed weight of every task you're eligible for at your combat and Slayer level.
How many tasks can I block?
Up to 6 with the standard unlocks (5 base blocks plus the expansion). Blocking removes a task from your pool, which raises the odds of every remaining task.
What are point-unlock tasks?
Tasks you buy with Slayer reward points to add them to a master's assignment list, such as boss tasks. They only appear once unlocked, so enabling one increases your pool.