How does the Paired t-Test Calculator work?

Calculate differences d = before − after Then: Mean difference d̄ and standard deviation s_d Then: t = d̄ / (s_d/√n) Then: Compare t to critical value for df = n−1.

Can you give an example of how to use the Paired t-Test Calculator?

Example: Input Before: [20,22,19], After: [18,20,18] gives a result of Mean diff = 1.67, t = 1.53, df = 2, not significant.

Is the Paired t-Test Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Paired t-Test Calculator?

Our Paired t-Test Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Paired t-Test Calculator

Before values (space/comma)

After values

The paired t-test compares means of two related groups (e.g., before and after measurements on the same subjects). It tests whether the mean difference is significantly different from zero.

Symbol	Name	Unit	Description
d	difference between paired measurements	—	—
d̄	mean of differences	—	—
sₐ	standard deviation of differences	—	—
n	number of pairs	—	—
t	t-statistic	—	—

df	α=0.10	α=0.05	α=0.01
5	2.015	2.571	4.032
10	1.812	2.228	3.169
20	1.725	2.086	2.845
30	1.697	2.042	2.750
∞	1.645	1.960	2.576

References

›Paired t-test — Statistics How To

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Paired t-Test Calculator

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Paired t-Test Calculator