T.INV.2T Function in Excel: Critical t Value

T.INV.2T Function in Excel: Critical t Value featured illustration

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⏱ 2 min readUpdated 5 October 2026

StatisticsLevel: ExpertAvailable in: Excel 2010+

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

T.INV.2T returns the t value for a two-tailed test — the multiplier for a confidence interval on a small sample.

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Syntax

=T.INV.2T(probability, deg_freedom)
Argument What it means
probability 0.05 for 95% confidence.

Examples

Example 1

=T.INV.2T(0.05, 29)

About 2.045 for a sample of 30 (vs 1.96 for the normal curve).

T.INV.2T in practice

Where you will use it

  • Critical t for a confidence interval
  • Small-sample margins
  • Hypothesis tests

Worked example

AlphadfFormulaResult
0.0510=ROUND(T.INV.2T(A2,B2),4)2.2281
0.0530=ROUND(T.INV.2T(A3,B3),4)2.0423
0.0110=ROUND(T.INV.2T(A4,B4),4)3.1693

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
One vs two tails2T splits alpha across both tails
Alpha0.05 for 95%

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