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Calcimator

Loot Drop Probability Calculator

Calculate expected items and attempt counts from drop rates.

Inputs

%

Results

Chance of ≥1 Drop

64.15%

Expected Drops1
Attempts for 50% Chance14
Attempts for 99% Chance90
Expected Runs for Target20
How to Use This Calculator
  1. Enter the Drop Rate percentage per attempt for the item you are farming.
  2. Enter the Number of Attempts (kills, runs, or openings) you plan to make.
  3. Enter the Target Drop Count — how many copies of the item you want to collect.
  4. Review Chance of at Least 1 Drop and Expected Drops for your attempt count.
  5. Check Attempts for 50% and 99% Chance to set realistic farming expectations.

How the result changes with Drop Rate

Drop RateChance of ≥1 Drop
1087.84%
3599.98%
65100%
90100%

What each input means

Drop Rate
Per-attempt drop probability as a percentage.
Number of Attempts
How many times you kill/open/run the encounter.
Target Drop Count
How many of the item you want to collect.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Drop Rate = 5, Number of Attempts = 20, Target Drop Count = 1 = 3 input(s) provided
  2. Calculate Chance of ≥1 Drop
    Chance of ≥1 Drop
    64.15 = 64.15
  3. Calculate Expected Drops
    Expected Drops
    1 = 1
  4. Calculate Attempts for 50% Chance
    Attempts for 50% Chance
    14 = 14

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