P-Value Calculator
Get the exact p-value for a test statistic you already have, for example from a published paper or a hand calculation.
Updated · By Bibin XavierData 90 × 12
| IDtext · 90 levels | Grouptext · 3 levels | Gendertext · 2 levels | Agenumeric | Hours_Studynumeric | Anxietynumeric | Motivationnumeric | Pre_Scorenumeric | Post_Scorenumeric | Exam_Scorenumeric | Passednumeric · coded | Satisfactionnumeric · coded |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S001 | Control | Male | 23 | 11.2 | 29 | 4.6 | 60 | 62 | 67 | 1 | 2 |
| S002 | Workshop | Female | 23 | 3.9 | 28 | 3.5 | 54 | 70 | 54 | 0 | 2 |
| S003 | Online | Female | 18 | 10.1 | 32 | 4 | 55 | 57 | 66 | 0 | 3 |
| S004 | Control | Male | 26 | 13.6 | 41 | 3.5 | 52 | 55 | 59 | 0 | 3 |
| S005 | Workshop | Female | 22 | 9.7 | 27 | 3.6 | 56 | 63 | 65 | 0 | 4 |
| S006 | Online | Female | 20 | 7.9 | 32 | 3.8 | 65 | 82 | 65 | 0 | 2 |
| S007 | Control | Female | 20 | 6.3 | 28 | 3 | 72 | 83 | 61 | 0 | 3 |
| S008 | Workshop | Male | 22 | 8 | 29 | 3.1 | 64 | 72 | 62 | 1 | 3 |
Variables and options
Results
Calculated in your browserInterpretation
For t(28) = 2.31, the two-tailed p-value is .0285.
How to cite this tool
Using these results in a thesis, journal article, report or class assignment? Please cite this free tool so others can find it. It keeps the site free.
APA 7
Xavier, B. (2026). P-Value Calculator [Web application]. FreeStatisticalTools.com. https://freestatisticaltools.com/p-value-calculator/
BibTeX
@software{xavier_pvaluecalculator_2026,
author = {Xavier, Bibin},
title = {P-Value Calculator},
publisher = {FreeStatisticalTools.com},
year = {2026},
url = {https://freestatisticaltools.com/p-value-calculator/},
note = {Web application}
}Suggested sentence for your methods section: “The analysis was carried out with the free P-Value Calculator tool on FreeStatisticalTools.com (Xavier, 2026).”
What is a p-value?
If you have a test statistic but no p-value, this calculator returns the exact probability from the t, z, F, chi-square or correlation distribution, one- or two-tailed.
When to use a p-value
Use this when you have a test statistic and degrees of freedom but no p-value. F and chi-square tests are always right-tailed.
How to use this calculator
- Enter the values. Fill in statistic, value, degrees of freedom (or n for r) and tails.
- Read the results. Results update automatically. Read the plain-English interpretation, then use Copy table to paste APA-style tables into Word and Copy for the results sentence.
Frequently asked questions
How do I find a p-value from a t statistic?
Choose t, enter the t value and its degrees of freedom, and select two-tailed unless your hypothesis predicted a direction in advance.
Are F and chi-square tests one- or two-tailed?
They are right-tailed by construction, because larger values always mean more evidence against the null hypothesis.
What does p < .05 mean?
It means a result at least this extreme would occur less than 5% of the time if the null hypothesis were true. It does not give the probability that the hypothesis is true.
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