The Excel T.DIST.RT function returns the right-tailed Student's t-distribution — the probability in the upper tail beyond a given t-value for the specified degrees of freedom.
Syntax
| Argument | Description | |
|---|---|---|
x | Required | The t-value at which to evaluate the distribution. |
deg_freedom | Required | The degrees of freedom (a positive integer). |
How to use it
T.DIST.RT gives the area under the curve to the right of x — the one-sided p-value for a directional hypothesis like “the mean is greater than expected.”
It is the complement of the left-tailed cumulative value, so T.DIST.RT(x, df) equals 1 − T.DIST(x, df, TRUE). Doubling it gives the two-tailed result from T.DIST.2T.
One-tailed p-values: T.DIST.RT is the function you reach for when reporting a one-sided test. For the corresponding critical t-value, invert it with T.INV.
Try it: interactive demo
Pick a T.DIST.RT example to see the formula and its result.
Practice workbook
Frequently asked questions
What does T.DIST.RT return?
How does it relate to T.DIST?
T.DIST.RT(x, df) = 1 − T.DIST(x, df, TRUE). Together the left and right tails sum to 1.Can x be negative in T.DIST.RT?
How do I get a two-tailed p-value from this?
2 × T.DIST.RT(x, df) equals T.DIST.2T(x, df) for a non-negative x.Master functions like this in one day
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