GAMMA.INV Function in Excel: Value for a Gamma Probability

GAMMA.INV Function in Excel: Value for a Gamma Probability 1
⏱ 1 min readUpdated 5 October 2026

StatisticsLevel: ExpertAvailable in: Excel 2010+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. GAMMA.INV in practice
  5. Where you will use it
  6. Worked example
  7. Mistakes people make
  8. Related functions

GAMMA.INV returns the value at a given gamma probability.

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Syntax

=GAMMA.INV(probability, alpha, beta)
Argument What it means
probability 0..1
alpha, beta Shape and scale

Examples

Example 1

=ROUND(GAMMA.INV(A2,B2,C2),3)

Result: 6.713. See the worked example table below for more cases.

GAMMA.INV in practice

Where you will use it

  • 95th-percentile claim size
  • Service-level repair time
  • Simulation

Worked example

palphabetaFormulaResult
0.524=ROUND(GAMMA.INV(A2,B2,C2),3)6.713
0.9524=ROUND(GAMMA.INV(A3,B3,C3),3)18.975
0.935=ROUND(GAMMA.INV(A4,B4,C4),3)26.612

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
p = 1#NUM!
Wrong scaleCheck beta is the scale

GAMMA.DIST

📚 Part of the free Excel course: Beginner → Expert · Try it in the Formula Lab or ask the AI Helper.

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