On Drop Rate
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About On Drop Rate

On Drop Rate helps you check roughly how long you'd need to grind for an item, and whether you're actually dry right now, or just feeling like it.

We're passionate OSRS players, grinding since the game's 2013 release across multiple accounts and every seasonal game mode along the way.

This vibe-coded project is built and maintained by us.

Greetings from Team On Drop Rate.

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← All bosses
Cerberus
Cerberus
Kills per hour modifier
kills/hour

The Primordial crystal takes about
11 hours and 33 minutes to obtain if you are exactly on droprate.

Expected kills
520
Expected kills on drop rate
Expected time to obtain
11h 33m
at 45 kills/hour (average)

The time to obtain Primordial crystal at Cerberus, if you are exactly on drop rate, will be 16 hours and 15 minutes with beginner gear, 11 hours and 33 minutes with average gear and 10 hours in max gear. That is about 520 kills on average.

Customize your estimated kills per hour above to see your own time to be on drop rate.

Additional information

During this grind you will also be making roughly 39,969,749 gp in total loot — about 3,458,921 gp per hour at 45 kills per hour. The biggest earner over that stretch is Primordial crystal at about 19,641,593 gp.

Each kill has a 0.1923% chance at Primordial crystal. Half of all players get it within 361 kills, 1,197 kills covers 90%, and 2,393 kills covers 99% — so going past 520 kills without one is unlucky, but not unusual.

Loot values use live Grand Exchange prices and shift with the market.

Loot from 520 kills

Loading prices…
Item Quantity Price (ea) Total value
Total loot value—

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