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
Tombs of Amascut (150)
Tombs of Amascut (150)
Invocation level
(150) (300) (545)
Kills per hour modifier
kills/hour

The Osmumten's fang takes about
56 hours and 40 minutes to obtain if you are exactly on droprate.

Assumes solo raids

Expected kills
170
Expected kills on drop rate
Expected time to obtain
56h 40m
at 3 kills/hour (average)

The time to obtain Osmumten's fang at Tombs of Amascut (150), if you are exactly on drop rate, will be 113 hours and 20 minutes with beginner gear, 56 hours and 40 minutes with average gear and 42 hours and 30 minutes in max gear. That is about 170 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 195,653,997 gp in total loot — about 3,452,718 gp per hour at 3 kills per hour. The biggest earner over that stretch is Tumeken's shadow (uncharged) at about 112,258,614 gp.

Each kill has a 0.5882% chance at Osmumten's fang. Half of all players get it within 118 kills, 391 kills covers 90%, and 781 kills covers 99% — so going past 170 kills without one is unlucky, but not unusual.

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

Loot from 170 kills

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

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