Poisson Distribution CalculatorThe calculator that you can find at the bottom of this page is an online Poisson distribution calculator. It gives the probability of an event occurring a given number of times. You must know the expected frequency of the event.We're just coding this formula: probability = e[-f + x ln(f) - ln(x!)]
where
f = calculated frequency Example: A firmware is being embedded in a a lot of 2000 microcontrollers. The probability of any microcontroller failing is 0.001 (just a conjecture and nothing to do with reality, ok?) Then we can expect 2 microcontrollers will suffer a severe problem (2000 x 0.001 = 2). What is the probability that 4 micros will fail? We use our spreadsheet below and enter known data as input: Enter calculated
frequency = 2 Our calculator answer
is 
Reference: Poole, L.; Borchers, M.; Some Common Basic Programs; Osborne/McGraw-Hill; 3rd. edition; Berkeley, CA; 1979. From 'Poisson Distribution Calculator' to home From 'Poisson Distribution Calculator' to Free Online Calculators
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