Statistics test calculator — t-test, ANOVA and chi-square with p-values

Paste data from Excel to run an independent or paired t-test, one-way ANOVA or chi-square test. Get the test statistic, degrees of freedom, p-value, effect size and an APA-style sentence for your report — no SPSS needed.

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Paste groups as columns (first row = group names). Copy straight from Excel.

Group	n	Mean	SD
A	8	75.50	4.50
B	8	86.25	3.77

Statistic

t = -5.18

13.58

p-value

< 0.001

Effect size

Cohen's d = 2.59

The difference is statistically significant at the 5% level.

Mean difference: -10.75

Report it like this (APA):t(13.58) = -5.18, p < .001, d = 2.59

Calculated in your browser; nothing is uploaded. Check that the test's assumptions fit your data.

Which test to use

Compare two group means (class A vs class B) with an independent t-test, before/after on the same people with a paired t-test, three or more groups with ANOVA, and relationships between categories with chi-square.

The independent t-test uses Welch's version by default (unequal variances allowed); switch to Student's if you need it.

Reading the result

If p is below 0.05, the difference is statistically significant at the 5% level. Effect sizes (Cohen's d, η², Cramér's V) show how big the difference really is.

Copy the APA line, e.g. t(14) = 2.85, p = .013, d = 1.43, straight into your report.

Frequently asked questions

Does it match SPSS or Excel?

It uses the same formulas (Welch degrees of freedom, F and chi-square distributions), so results match apart from rounding.

Does it test normality?

Not yet. With small, very skewed samples, consider a non-parametric test.

Is my data uploaded?

No. All calculations run in your browser.