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Excel TTEST Function

Author: Amanda Li Last Modified: 2022-08-20

The TTEST function returns the probability that is associated with a Student's t-test. TTEST is often used to test the probability of two samples that have underlying populations with the same mean.

Note: TTEST has been replaced with T.TEST. Although TTEST is still available in current versions of Excel, you should consider using the new function from now on, because TTEST may not be available in Excel’s future versions.

ttest function 1


=TTEST(array1, array2, tails, type)


  • array1 (required): The first data set.
  • array2 (required): The second data set.
  • tails (required): The number of distribution tails to use. This must be either:
    • 1, to use the one-tailed distribution;
    • 2, to use the two-tailed distribution.
  • type (required): A number indicates which type of t-test to perform:
    • 1, to perform a paired t-test;
    • 2, to perform a two-sample equal variance t-test;
    • 3, to perform a two-sample unequal variance t-test

Return Value

The TTEST function returns a numeric value.

Function Notes

  • If tails and type are not integers, they will be truncated.
  • TTEST returns the #N/A error if array1 and array2 have a different number of data points, and you want to perform a paired t-test (type=1).
  • TTEST returns the #VALUE! error if either of the supplied tails and type is non-numeric.
  • TTEST returns the #NUM! error if:
    • tails is any value other than 1 or 2;
    • type is any value other than 1, 2 or 3.


To calculate the probability associated with a Student's paired t-test, with one and two-tailed distribution, please copy or enter the formulas below in the corresponding result cells, and press Enter to get the results.



ttest function 2

Related functions

Excel T.TEST Function

The T.TEST function returns the probability that is associated with a Student's t-test. T.TEST is often used to test the probability of two samples that have underlying populations with the same mean.

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