Pick your drop, enter your KC, receive your official dryness verdict. Then let the simulator
show you how the RNG gods really feel about you.
⚔ CHALLENGE: Scroll to the simulator and roll.
Your dry check
ON RATE
Luck simulator - how long would it take YOU?
One click simulates kill after kill until the drop lands, using the exact 1/X odds. Every
roll is a fresh timeline. How many lifetimes will yours take?
?
KILL COUNT
What “dry” means mathematically
A drop rate of 1/X describes one independent roll per eligible kill, not a promise that the
item appears by X kills. The chance of at least one drop after k eligible rolls is
1 - (1 - 1/X)^k. The calculator compares that chance with your kill count and
reports how many equally committed players would still be empty-handed.
At the stated rate
k = X gives about 63.2% chance of one or more drops and 36.8% chance of no drop.
Twice the rate
k = 2X gives about 86.5% chance of a drop and 13.5% still dry.
Three times the rate
k = 3X gives about 95.0% chance of a drop and about 5.0% still dry.
The percentages are population probabilities, not a ranking of player skill. “Dryer than 95%” means the streak is uncommon under the stated model; it does not mean the next kill is more likely.
Read the result without fooling yourself
Past rate is not “due”
Each eligible kill starts a fresh roll with the same probability. A 1/1,000 item after 2,000 misses is still 1/1,000 on the next eligible roll. The calculator shows the cost of the streak, not a pity timer that the game does not have.
“Over rate” is not a percentile
Being 2.0x the listed rate is a distance measure. The “dryer than” percentage uses the complementary cumulative probability and answers a different question: how many players would have seen the drop by this KC?
Check what counts as a roll.
Raid pets and uniques may be rolled per purple, per reward room or by points rather than once per completed raid. The table notes these exceptions. Enter eligible rolls, not a boss kill count that includes trips without a roll.
Worked 1/1,000 example
Suppose the selected item is a true 1/1,000 roll and you have 2,000 eligible kills. The calculator's core values are:
Chance to have it
1 - (999/1000)^2000 = 86.5%
Chance to remain dry
(999/1000)^2000 = 13.5%
Distance from rate
2000 / 1000 = 2.00x
That is a strong dry streak, but it is still a normal outcome for roughly one in seven players under the same assumptions. If the source rate is point-scaled or conditional, replace the simple example with the source's actual roll definition.
What the simulator is for
Use the check for your real KC. It is deterministic for the selected rate and count, so you can explain the result to a clan or include it in a progress post.
Use the simulator for intuition. Each roll samples independent kills until the first success. It demonstrates the spread of possible timelines; one roll is not a forecast of your account.
Repeat before drawing a conclusion. Random samples can cluster. The simulator does not model pity systems, changing rates, team contribution or a different item table.
Share the assumptions. Include the source, rate, eligible KC and whether the rate is conditional. A screenshot without those fields is easy to misread.
Data scope and review notes
Included
Independent-roll probability and complementary dry probability.
Distance from listed rate and population percentile language.
Browser-only random simulator with personal roll records.
Limitations
Rates are snapshots and can differ by task, difficulty, points or team contribution.
The simulator cannot reproduce a boss's full loot table or your kill eligibility.
It does not predict when an individual account will receive a drop.
Drop references are linked in the table and cross-checked against the OSRS Wiki. The embedded drop snapshot and this explanation were reviewed 16 October 2026; verify the source page after a loot-table or raid-rate update.
Famous OSRS drop rates
Tap any drop to load it into the calculator. Raid uniques use the commonly cited average
rates - see each note.
Boss pets
Drop
Source
Rate
Note
Herbi
Herbiboar
1/6,500
Per herbiboar harvested; the classic Hunter dry-streak pet
Pet zilyana
Commander Zilyana
1/5,000
Classic GWD 1/5,000; source of legendary dry streak posts
Pet general graardor
General Graardor
1/5,000
Tertiary roll per kill
Pet dark core
Corporeal Beast
1/5,000
Tertiary roll per kill
Phoenix
Wintertodt
1/5,000
Per supply crate (rounds with 500+ points); 5x dry posts are a subreddit staple
Pet snakeling
Zulrah
1/4,000
Tertiary roll every kill; famously 1/4,000 vs the usual 1/3,000 boss pet rate
Vorki
Vorkath
1/3,000
Tertiary roll per post-quest Vorkath kill
Ikkle hydra
Alchemical Hydra
1/3,000
Tertiary roll per kill
Hellpuppy
Cerberus
1/3,000
Tertiary roll per kill
Noon
Grotesque Guardians
1/3,000
Rolled once per completed encounter (Dusk's death)
Pet kraken
Kraken
1/3,000
Tertiary roll per kill
Prince black dragon
King Black Dragon
1/3,000
Tertiary roll per kill
Abyssal orphan
Abyssal Sire
1/2,560
5/128 from an Unsired; Unsired is 1/100, so ~1/2,560 per kill
Muphin
Phantom Muspah
1/2,500
Tertiary roll per kill
Yami
Yama
1/2,500
2025 boss; tertiary roll per kill
Youngllef
The Gauntlet
1/2,000
1/800 in the Corrupted Gauntlet
Little nightmare
Phosani's Nightmare
1/1,400
Phosani's rate; team Nightmare 1/800-1/4,000 scaled by team size/contribution
Bloodhound
Master clue caskets
1/1,000
Per master reward casket opened
Lil' zik
Theatre of Blood
1/650
Best case (MVP, deathless); 1/500 in Hard Mode; worse odds otherwise
Tumeken's guardian
Tombs of Amascut
1/500
Point-scaled: ~1/500 around solo 400 raid level, improves at higher invocations
Nexling
Nex
1/500
Rolled for players with loot eligibility on the kill
Tzrek-jad
TzTok-Jad (Fight Caves)
1/200
1/100 if on a TzHaar/Jad slayer task; also from sacrificing fire cape
Smol heredit
Sol Heredit (Colosseum)
1/200
Per Fortis Colosseum completion
Jal-nib-rek
TzKal-Zuk (Inferno)
1/100
1/75 on task; sacrificing an infernal cape is also 1/100
Skotos
Skotizo
1/65
Best pet rate in the game, but kc gated by dark totems
Olmlet
Chambers of Xeric
1/53
Per purple, not per raid: 1/53 when the unique table hits (~1/1,500-2,650 raids by points)
Megarares
Drop
Source
Rate
Note
Elysian sigil
Corporeal Beast
1/4,095
1/585 sigil table x 1/7 elysian; spectral/arcane are 1/1,365
Twisted bow
Chambers of Xeric
1/1,725
Common dry-calc avg: ~2% purple/raid x Tbow 2/69 of purples (1/34.5). Point-scaled: ~1/1,000 at 30k pts
Tumeken's shadow
Tombs of Amascut
1/530
Solo ~400 raid lvl: purple ~1/28 x 1/19 weight. Point-scaled; far drier at low invocations
Scythe of vitur
Theatre of Blood
1/172
Team-wide: ~11% purple (deathless) x 1/19 weight = ~1/173/raid; personal ~1/690 in a 4-man
Chase uniques
Drop
Source
Rate
Note
Draconic visage
Vorkath
1/5,000
Also 1/5,000 from KBD; 1/10,000 from black dragons and skeletal wyverns
Dragon warhammer
Lizardman shaman
1/3,000
Buffed from 1/5,000 in the Apr 2024 Project Rebalance
Harmonised orb
Phosani's Nightmare
1/1,600
Eldritch and volatile orbs also 1/1,600 each; team Nightmare is rarer
Ranger boots
Medium clue caskets
1/1,133
Per reward slot; ~1/283.6 per casket (3-5 slots each)
Ultor vestige
Vardorvis
1/1,088
Needs 3 hidden hits of 1/136 unique table x 3/8 roll; wiki effective avg 1/1,088
Inquisitor's armour piece
Phosani's Nightmare
1/700
Each of helm/hauberk/plateskirt 1/700; mace is 31/35,000 (~1/1,129)
Araxyte fang
Araxxor
1/600
Makes amulet of rancour; noxious halberd pieces are 1/200 each
Magic fang
Zulrah
1/512
1/1,024 per roll, 2 rolls per kill (~1/512/kill); any Zulrah unique ~1/162.5
Tanzanite fang
Zulrah
1/512
1/1,024 per roll, 2 rolls per kill (~1/512/kill)
Enhanced crystal weapon seed
Corrupted Gauntlet
1/400
1/2,000 from the regular Gauntlet
Voidwaker piece (blade/hilt/gem)
Vet'ion / Callisto / Venenatis
1/360
Each piece 1/360 from its boss; 1/912 from Calvar'ion/Artio/Spindel
Zenyte shard
Demonic gorilla
1/300
Need 4 shards for the full jewellery set; tortured gorillas are rarer
Soulflame horn
Yama
1/300
1/120 unique table x 2/5 solo (~1/300); reflects May 2025 rate reduction
Dragon pickaxe
Vet'ion / Callisto / Venenatis
1/256
Post-2023 wildy rework rate; also 1/400 from Kalphite Queen
Jars
Drop
Source
Rate
Note
Jar of swamp
Zulrah
1/3,000
Tertiary roll per kill
Jar of souls
Cerberus
1/2,000
Tertiary roll per kill
Jar of sand
Kalphite Queen
1/2,000
Tertiary roll per kill
Jar of dirt
Kraken
1/1,000
Tertiary roll per kill
Jar of spirits
Corporeal Beast
1/1,000
Tertiary roll per kill
Meme tier
Drop
Source
Rate
Note
Curved bone
Big-boned monsters
1/5,013
Universal 1/5,012.5 (399/400 x 1/5,000 behind the long bone roll, per Mod Ash)
Champion's scroll
Champion race monsters
1/5,000
Each race's scroll is 1/5,000; the goblin scroll grind is a meme
Abyssal whip
Abyssal demon
1/512
The classic slayer chase drop since 2005
Dark bow
Dark beast
1/512
Tertiary-style rare from dark beasts
Dry math FAQ
What does going dry mean in OSRS?
Going dry means passing the drop rate without seeing the drop. A 1/1,000 drop is not guaranteed at 1,000 kills: roughly 37% of players are still empty-handed at that point, and about 13.5% are still dry at double rate.
Am I due for the drop if I'm past the rate?
No - every kill is an independent roll, so the drop is never due. Being 3x past rate is painful but changes nothing about your next kill. That is exactly what this calculator turns into a shareable verdict.
How is the dryness percentage calculated?
We use the real binomial odds: the chance of at least one drop in your KC is 1-(1-1/rate)^kc. If that chance is 92%, you are dryer than 92% of players who put in the same kill count.
What “dry” means mathematically