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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Nightmare / Phosani's calculation

Each unique's listed rarity (e.g. 1/750 for the Inquisitor's mace) is the item's real per-kill chance, taken live from the wiki's drop table. On Phosani's Nightmare (solo) every roll belongs to you, so that rarity is used directly.

On the regular Nightmare (5-man), that same per-kill chance is for the whole party — when it hits, only one random party member (weighted by damage) actually receives the item. So your personal expected kills to land it is the listed rarity × 5 (e.g. 750 × 5 = 3,750 kills), which is what the time estimate on this page uses.

Is PNM actually faster for uniques?

Yes — Phosani's Nightmare (PNM) is substantially better for farming uniques, even compared with a regular 5-man Nightmare team. The important distinction is uniques per player, not just the boss's raw drop table.

Bottom line for the unique grind: PNM >>> 5-man Nightmare. A 5-man team is mainly attractive because it's chill, social and easier — not because it's efficient for your own Inquisitor/orb.

← All bosses
Phosani's Nightmare
Phosani's Nightmare
Boss version
Phosani's Nightmare Nightmare (5-man)
Kills per hour modifier
kills/hour

The Inquisitor's mace takes about
141 hours and 8 minutes to obtain if you are exactly on droprate.

Expected kills
1,129
Expected kills on drop rate
Expected time to obtain
141h 8m
at 8 kills/hour (average)

The time to obtain Inquisitor's mace at Phosani's Nightmare, if you are exactly on drop rate, will be 188 hours and 10 minutes with beginner gear, 141 hours and 8 minutes with average gear and 112 hours and 54 minutes in max gear. That is about 1,129 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 1,498,196,131 gp in total loot — about 10,616,093 gp per hour at 8 kills per hour. The biggest earner over that stretch is Harmonised orb at about 374,675,414 gp.

Each kill has a 0.0886% chance at Inquisitor's mace. Half of all players get it within 783 kills, 2,599 kills covers 90%, and 5,197 kills covers 99% — so going past 1,129 kills without one is unlucky, but not unusual.

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

Loot from 1,129 kills

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

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