The GAMMA.INV function returns the inverse of the gamma cumulative distribution.

If p = GAMMA.DIST(x…), then GAMMA.INV (p…) = x. You can use this Function to study a variable whose distribution may be skewed.

**Syntax**:= GAMMAINV(probability,alpha,beta)

The GAMMA.INV function syntax has the following arguments:

**Probability**Required. The probability associated with the gamma distribution.**Alpha**Required. A parameter to the distribution.-
**Beta**Required. A parameter to the distribution. If beta = 1, GAMMA.INV returns the standard gamma distribution.

**Example**: Let’s look at some Excel GAMMA.INV function examples and explore how to use the GAMMA.INV function as a worksheet function in Microsoft Excel:

**Syntax**: =GAMMA.INV(B1,B2,B3)

**Result**: 3.037221607

**Note**:

- If any argument is text, GAMMAINV returns the #VALUE! error value.
- If probability < 0 or probability > 1, GAMMAINV returns the #NUM! error value.
- If alpha ≤ 0 or if beta ≤ 0, GAMMAINV returns the #NUM! error value.

Given a value for probability, GAMMAINV seeks that value x such that GAMMADIST(x, alpha, beta, TRUE) = probability. Thus, precision of GAMMAINV depends on precision of GAMMADIST. GAMMAINV uses an iterative search technique. If the search has not converged after 100 iterations, the function returns the #N/A error value.