Grinding for a rare item with a tiny drop rate feels endless, and it helps to know the real odds before you commit an evening to farming. A common mistake is assuming a 1 percent drop means you are guaranteed the item in 100 kills, which is false. This calculator uses the correct at least once formula: your cumulative chance equals one minus the probability of missing on every attempt, that is one minus (1 minus the drop rate) raised to the number of runs. Enter the drop rate and how many kills or runs you plan, and it instantly shows your overall chance, the expected number of drops, and the run counts needed to reach 50, 90, and 99 percent confidence. That last number is the honest answer to how much farming a rare truly takes. All math runs locally in your browser with nothing uploaded, so plan your grind with real probabilities.
Grinding for a rare item with a tiny drop rate feels endless, and it helps to know the real odds before you commit an evening to farming. A common mistake is assuming a 1 percent drop means you are guaranteed the item in 100 kills, which is false.
Yes. Loot Drop Probability Calculator is completely free, with no sign-up and no usage limits.
Yes. Loot Drop Probability Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Loot Drop Probability Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.