OSRS Tools

Drop Rate Calculator

Check your dry streak, hit chances, and share the link with the clan.

Clockwork

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Drop information

CreatorCraftedCreatorCrafted

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Shop CreatorCrafted

Probability

17.76%

Chance of getting the drop

82.2420%

Still dry

Expected wait (mean)512 KC
Expected drops by now0.20
50% chance by355 KC
90% chance by1,178 KC
99% chance by2,356 KC

How drop rates work

Each kill is an independent roll. A 1/512 drop does not guarantee the item at 512 KC — the cumulative chance is 1 − (1 − 1/rate)^kc. At the mean wait you are only ~63% likely to have received it; at 2× the rate you are ~86% likely.

Single vs any unique

Single is one 1/X item. Any unique combines independent rates (chance of hitting at least one per kill, then raised to your KC). For bosses with a shared unique table (GWD), prefer the combined rate preset (e.g. Any Bandos unique = 1/127) instead of multiplying four separate piece rates.

Related tools

Pets use level-scaled odds — see the Pet Odds Calculator. Raid uniques are often points-based — use the Raid Calculator.

Related tools

Browse everything on the tools index.

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