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
Calvar'ion
Calvar'ion
Boss version
Calvar'ion Vet'ion (solo)
Kills per hour modifier
kills/hour

The Skull of Vet'ion takes about
12 hours and 7 minutes to obtain if you are exactly on droprate.

Expected kills
618
Expected kills on drop rate
Expected time to obtain
12h 7m
at 51 kills/hour (average)

The time to obtain Skull of Vet'ion at Calvar'ion, if you are exactly on drop rate, will be 17 hours and 10 minutes with beginner gear, 12 hours and 7 minutes with average gear and 10 hours and 18 minutes in max gear. That is about 618 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 28,769,485 gp in total loot — about 2,374,181 gp per hour at 51 kills per hour. The biggest earner over that stretch is Dragon bones at about 3,407,594 gp.

Each kill has a 0.1618% chance at Skull of Vet'ion. Half of all players get it within 429 kills, 1,422 kills covers 90%, and 2,844 kills covers 99% — so going past 618 kills without one is unlucky, but not unusual.

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

Loot from 618 kills

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

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