EXPON.DIST function

Returns the exponential distribution. Use EXPON.DIST to model the time between events, such as how long an automated bank teller takes to deliver cash. For example, you can use EXPON.DIST to determine the probability that the process takes at most 1 minute.




  • X     Required. The value of the function.
  • Lambda     Required. The parameter value.
  • Cumulative     Required. A logical value that indicates which form of the exponential function to provide. If cumulative is TRUE, EXPON.DIST returns the cumulative distribution function; if FALSE, it returns the probability density function.


  • If x or lambda is nonnumeric, EXPON.DIST returns the #VALUE! error value.
  • If x < 0, EXPON.DIST returns the #NUM! error value.
  • If lambda ≤ 0, EXPON.DIST returns the #NUM! error value.
  • The equation for the probability density function is:


  • The equation for the cumulative distribution function is:




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Data Description
0.2 Value of the function
10 Parameter value
Formula Description (Result)
=EXPON.DIST(A2,A3,TRUE) Cumulative exponential distribution function (0.864665)
=EXPON.DIST(0.2,10,FALSE) Probability exponential distribution function (1.353353)
Applies to: