Returns the inverse of the righttailed probability of the chisquared distribution.
If probability = CHISQ.DIST.RT(x,...), then CHISQ.INV.RT(probability,...) = x. Use this function to compare observed results with expected ones in order to decide whether your original hypothesis is valid.
Syntax
CHISQ.INV.RT(probability,deg_freedom)
The CHISQ.INV.RT function syntax has the following arguments (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):
 Probability Required. A probability associated with the chisquared distribution.
 Deg_freedom Required. The number of degrees of freedom.
Remarks
 If either argument is nonnumeric, CHISQ.INV.RT returns the #VALUE! error value.
 If probability < 0 or probability > 1, CHISQ.INV.RT returns the #NUM! error value.
 If deg_freedom is not an integer, it is truncated.
 If deg_freedom < 1, CHISQ.INV.RT returns the #NUM! error value.
Given a value for probability, CHISQ.INV.RT seeks that value x such that CHISQ.DIST.RT(x, deg_freedom) = probability. Thus, precision of CHISQ.INV.RT depends on precision of CHISQ.DIST.RT. CHISQ.INV.RT uses an iterative search technique. If the search has not converged after 64 iterations, the function returns the #N/A error value.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
Data 
Description 
0.050001 
Probability associated with the chisquared distribution 
10 
Degrees of freedom 
Formula 
Description (Result) 
=CHISQ.INV.RT(A2,A3) 
Inverse of the onetailed probability of the chisquared distribution (18.3069735) 
