Measure single-drop odds, repeated-attempt probability, expected drops, and attempts needed for a target confidence.
Independent attempts compound. The correct probability of at least one success is one minus the probability that every attempt fails.
Expected drops is the long-run average, calculated as attempts multiplied by per-attempt chance. It is not a guarantee for one play session.
No finite number of independent random attempts guarantees a drop when the chance is below 100 percent. A confidence target describes probability, not certainty.
It uses the binomial distribution, combining the number of ways successes can occur with the probability of successes and failures.
Yes. Decimal percentages such as 0.05 are supported, which is useful for rare items and long farming estimates.