EXPON.DIST Function in Excel: Waiting-Time Probability

⏱ 1 min readUpdated 28 September 2026

StatisticsLevel: ExpertAvailable in: Excel 2010+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. Related functions

EXPON.DIST gives the chance the wait until the next event is under a given time.

Syntax

=EXPON.DIST(x, lambda, cumulative)
Argument What it means
lambda Events per unit time.

Examples

Example 1

=EXPON.DIST(1, 3, TRUE)

About 95%: the next call arrives within a minute at 3 calls/minute.

POISSON.DIST

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