Loot Drop Probability Calculator

About the Loot Drop Probability Calculator

The Loot Drop Probability Calculator helps you determine the likelihood of getting a specific item from loot drops over multiple attempts, considering drop rates and luck modifiers.

Gaming Utility Tool: Plan your farming strategy in RPGs, MMOs, or looter games.

Use this tool for games like Diablo, World of Warcraft, or any game with drop mechanics.

• Features:
  • Inputs: Base Drop Rate (%), Number of Attempts, Luck Modifier (%).
  • Calculates Adjusted Drop Rate, Probability of at least one drop, and Expected Drops.
  • Keypad includes digits (0–9), decimal point (.) for precise inputs.
  • Displays detailed probability breakdown.
  • Clear, backspace, and copy functionality for results.
  • Share or embed the calculator.
• Practical Applications: Useful for deciding how many runs are needed to likely obtain a rare item.
• How to Use:
  • Enter Base Drop Rate (as a percentage, e.g., 5 for 5%).
  • Enter Number of Attempts (e.g., number of kills or runs).
  • Enter Luck Modifier (as a percentage increase, e.g., 10 for 10%; optional, defaults to 0).
  • Use keypad digits or decimal point for inputs.
  • Click "Calculate" to see your drop probabilities.
  • Use "Clear" to reset or "⌫" to delete the last character.
  • Copy results or share/embed the calculator.
• Helpful Tips:
  • All inputs must be non-negative; Drop Rate must be between 0 and 100; Attempts must be positive.
  • Use decimal points for precise drop rates (e.g., 0.5%).
  • Luck Modifier increases the base drop rate (e.g., 10% increases a 5% drop rate to 5.5%).
  • Higher attempts significantly increase your chances of at least one drop.
  • Check your game’s drop rate data for accuracy.
• Examples:
  • Example 1:
    • Base Drop Rate = 5%, Attempts = 10, Luck Modifier = 0%
    • Calculations:
      • Adjusted Drop Rate = 5% × (1 + 0) = 5% = 0.05
      • Probability of No Drop = (1 - 0.05)^10 = 0.95^10 ≈ 0.5987
      • Probability of At Least One Drop = 1 - 0.5987 = 0.4013 = 40.13%
      • Expected Drops = 0.05 × 10 = 0.5
    • Result: Adjusted Drop Rate = 5%, Probability of At Least One Drop = 40.13%, Expected Drops = 0.5.
  • Example 2:
    • Base Drop Rate = 1%, Attempts = 20, Luck Modifier = 50%
    • Calculations:
      • Adjusted Drop Rate = 1% × (1 + 0.5) = 1% × 1.5 = 1.5% = 0.015
      • Probability of No Drop = (1 - 0.015)^20 = 0.985^20 ≈ 0.7397
      • Probability of At Least One Drop = 1 - 0.7397 = 0.2603 = 26.03%
      • Expected Drops = 0.015 × 20 = 0.3
    • Result: Adjusted Drop Rate = 1.5%, Probability of At Least One Drop = 26.03%, Expected Drops = 0.3.

Optimize your loot farming with this calculator. Share or embed it on your site!