 Repeated event

 
This calc finds the probability of something happening many times, by raising the onetime probability to the power of the number of repeated ocurrences.
 
In order to find the probability of many events all happening, it is necessary to multiply their probabilities together. Mathematically, this progression gives an exponential decay curve. CalcTool's unit menu allows you to enter the probability as a number, a ratio, or a percentage, as is convenient.  