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Paired Samples Difference t-Test Calculator

t = d̄ / (sd/√n) — paired t-test for before/after studies.

Calculates the t-statistic for a paired t-test from the mean difference, standard deviation of differences, and sample size.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t = d̄ / (Sd / √n); df = n − 1

In depth

Calculates the t-statistic for a paired t-test from the mean difference, standard deviation of differences, and sample size.