T.DIST.RT Function in Excel: One-Tailed t p-Value (Right)

T.DIST.RT Function in Excel: One-Tailed t p-Value (Right) 1
⏱ 1 min readUpdated 5 October 2026

StatisticsLevel: ExpertAvailable in: Excel 2010+

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

T.DIST.RT gives the right-tailed t probability, for ‘is it greater?’ tests.

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Syntax

=T.DIST.RT(x, deg_freedom)
Argument What it means
x t statistic
deg_freedom df

Examples

Example 1

=ROUND(T.DIST.RT(A2,B2),4)

Result: 0.031. See the worked example table below for more cases.

T.DIST.RT in practice

Where you will use it

  • One-sided tests (did sales increase?)
  • Teaching
  • QC

Worked example

tdfFormulaResult
2.110=ROUND(T.DIST.RT(A2,B2),4)0.031
120=ROUND(T.DIST.RT(A3,B3),4)0.1646
3.55=ROUND(T.DIST.RT(A4,B4),4)0.0086

Results calculated in Excel.

Mistakes people make

MistakeWhat to do instead
Using it for 'any difference'Use T.DIST.2T
Deciding the direction after seeing dataChoose one-sided only before looking

T.DIST.2T

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

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