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
Zulrah
Zulrah
Kills per hour modifier
kills/hour

The Tanzanite fang takes about
17 hours and 4 minutes to obtain if you are exactly on droprate.

Expected kills
512
Expected kills on drop rate
Expected time to obtain
17h 4m
at 30 kills/hour (average)

The time to obtain Tanzanite fang at Zulrah, if you are exactly on drop rate, will be 36 hours and 34 minutes with beginner gear, 17 hours and 4 minutes with average gear and 12 hours and 48 minutes in max gear. That is about 512 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 56,646,275 gp in total loot — about 3,319,118 gp per hour at 30 kills per hour. The biggest earner over that stretch is Tanzanite fang at about 9,945,661 gp.

Each kill has a 0.1953% chance at Tanzanite fang. Half of all players get it within 355 kills, 1,178 kills covers 90%, and 2,356 kills covers 99% — so going past 512 kills without one is unlucky, but not unusual.

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

Loot from 512 kills

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

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