Inputs stay visible
A useful result starts with values you can inspect. Calculators show the rate, count, time, cost, or target that drives the output instead of presenting hidden account data as known.
Free · No signup · Inputs stay visible
LootCalcProbability, progress, and resource calculators
Build a scenario from a documented rule or values you can verify in game. LootCalc separates fixed-rate math, guarantees, progress counters, costs, and full-cycle timing so an estimate does not masquerade as private account data or a guaranteed outcome.
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Quick Drop Chance Calculator
Enter a fixed chance per attempt and the number of independent attempts.
Results for 1% × 100 attempts
- Chance of at least one
- 63.40%
- Chance of no success
- 36.60%
- Expected attempts for one
- 100Not a guarantee
- 50% target
- 69
- 90% target
- 230
- 95% target
- 299
At a fixed 1% chance over 100 independent attempts, the chance of at least one success is 63.40%. There is still a 36.60% chance of receiving nothing.
This model assumes a fixed rate and independent attempts.
Not for pity systems, hard guarantees, changing rates, weighted loot tables, or dependent events.
What LootCalc is designed to show
LootCalc turns user-provided inputs and documented game rules into probability, expected-value, and pace estimates. The useful part is not a claim that the site knows everything; it is being able to see what the result assumes and change the inputs when your situation differs.
Math has a stated model
Probability and expected-value pages explain the formula and its boundaries. A fixed independent rate, a guarantee, and a progressive pity curve are treated as different models.
Sources belong beside claims
Formula-changing mechanics should link to a public source and carry a verification date. If a reliable source is unavailable, the value should be an editable assumption rather than a certainty claim.
Limits are part of the answer
LootCalc cannot read private game accounts, predict a single RNG outcome, or guarantee that an old seasonal value is still current. Pages should say when those limits matter.
Supported Games & Tools
Use versioned probability, resource, batch-accounting, and progress tools across OSRS, WoW Delves, Diablo 4 Helltide, Path of Exile mapping, Warframe Relics, Escape from Tarkov raids, Borderlands 3 drops, and more.
Old School RuneScape
- Brother-count equipment formula
- Named-piece and repeated-chest odds
- Current values, route costs, and timing
Chaos Zero Nightmare
- Final-state Save Data count against your displayed cap
- Monster grades, Divine, removals, refinements, and duplicates
- Separate character budgets with no cross-character pooling
World of Warcraft
- Current World-row progress input
- Three live threshold inputs
- Qualifying runs & full-batch timing
Diablo IV
- Current on-screen costs as inputs
- Budget, shortfall & remaining cinders
- User-defined value and full-session time
Path of Exile
- Observed or what-if batch totals
- Direct costs, losses & break-even
- Versioned value and full-session time
Warframe
- One current chance per displayed Relic
- Mixed-squad complement probability
- Repeated-run thresholds and full time
Final Fantasy XIV
- Confirmed-award EP/GP priority ledger
- Compatible gear and token timeline
- Weekly vs inventory cap diagnostics
Apex Legends
- EA 0.045% minimum-rate estimate
- 500 eligible-pack guarantee tracker
- Input-driven Battle Pass pace planner
Raid Shadow Legends
- Current Portal target-rate input
- Separate Shard and rarity counter log
- Additive schedule and Shard-count boundary
Lost Ark
- User-entered current success chance
- Optional guarantee boundary
- Your material and currency valuation
Destiny 2
- User-entered fixed or changing rate
- Eligible-attempt and source notes
- No weapon-specific hidden preset
Minecraft
- Edition/version and table-path notes
- Simple fixed-roll weighted-pool mode
- Direct probability for complex tables
Borderlands 3
- User-entered target probability
- Optional conditional variant chance
- Measured full-cycle farm time
Escape from Tarkov
- User-entered target find chance
- Conditional extraction probability
- Measured full-cycle time and target contribution
Elden Ring
- User-entered effective probability
- Regulation and setup provenance notes
- Equivalent checks and full-cycle time
Featured Guides
Learn which rules are sourced, which values remain editable, how to record a complete scenario, and when a model no longer applies.
Beginner
Getting Started with LootCalc
Learn how to choose a tool, document inputs and sources, read results, and stop when the live game conflicts with a model.
Read Guide
OSRS
OSRS Barrows Evidence-First Guide
Audit equipment odds, Reward Potential, route observations, and dated valuations.
Read Guide
WoW
WoW Delves Progress Evidence Guide
Capture current thresholds, qualifying credit, a complete batch timer, and an auditable progress log.
Read Guide
PoE
PoE Map Batch Accounting Guide
Freeze the patch and valuation timestamp, then log gross returns, direct costs, and complete-session time.
Read Guide
Calculator Features
Features vary by game, but the evidence boundary and the inputs that drive a result should remain visible.
🔗
Visible source boundary
A documented game rule links to its source. Unknown rates, prices, and route times remain editable inputs instead of hidden defaults.
💰
Scenario values stay editable
Tools that use costs, values, or timing ask for values that match your version and complete measurement boundary. LootCalc does not claim a universal live price feed.
📊
Model-specific outputs
Fixed independent trials, hard guarantees, capped budgets, and deterministic progress use different models. A page states which one applies and what it excludes.
🧮
Reproducible states
Many calculators provide a copyable URL for their current inputs. Invalid, incomplete, and guarantee-boundary states return an explanation instead of a plausible-looking number.
Recent Updates & Guides
View all →Apex Heirloom Model Aligned with EA's Published Rules
Calculator UpdatePlan heirloom progress from EA's disclosed 0.045% minimum rate, the 500 eligible-pack guarantee, explicit exclusions, and a diagnostic state at the cap.
CZN Tools Updated for the Season 2 Save Data System
Tools UpdateAll three tools now model the final saved result, current card grades, explicit removal and duplicate limits, and the in-game caps you enter yourself.
Genshin Wish Planner Rebuilt Around Current Details
Guide UpdatePlan a deterministic guarantee ceiling from the current counter, selected-target state, owned wish items, Primogems, and versioned HoYoverse sources.
Diablo 4 Helltide Planner Rebuilt Around Live Inputs
Guide UpdateThe Helltide planner works from visible chest costs and values you enter, keeping a clear boundary between documented rules and your own observations.
WoW Delves Planner Rebuilt for Midnight Progress Rules
Guide UpdatePlan Delves progress from current Journeys or Great Vault inputs, with reward thresholds you can check against the live game.
OSRS Barrows Guide Rebuilt on the Published Formula
Guide UpdateEstimate Barrows uniques with the published brother-count formula and item values you enter yourself.
Elden Ring Evidence-First Drop-Rate Guide
Guide UpdateTie an effective rate to the exact regulation, source, item, setup, eligible checks, and a measured full route.
Minecraft Evidence-First Loot-Table Guide
Guide UpdateTrace edition, exact version, file path, eligible weights, rolls, functions, and full-cycle timing before calculating a loot-table scenario.
Frequently Asked Questions
How accurate are the calculations?
LootCalc documents the formula, assumptions, source notes, and update date on major calculators. Results are estimates for long-term planning, and real runs can vary because loot systems are random.
What games are currently supported?
Core tools cover OSRS, World of Warcraft, Diablo 4, Path of Exile, Warframe, Minecraft, Borderlands 3, Escape from Tarkov, Elden Ring, Destiny 2, Lost Ark, FFXIV, Apex Legends, RAID: Shadow Legends, Genshin Impact, and Chaos Zero Nightmare.
Is LootCalc free to use?
Yes. The calculators are free, work in the browser, and do not require account creation or a paywall.
Where do the data snapshots come from?
Each calculator identifies its source boundary. Fixed mechanics link to a public source where one is available; unknown rates, prices, and timing stay editable and should carry the user's own provenance notes.