T-Test Calculator

Paste raw sample data to calculate means, t statistic, degrees of freedom, two-sided p-value, and a confidence interval for the mean difference.

Test

Null mean (μ₀)

Confidence

Sample 1

Sample 2

—t statistic

—Degrees of freedom

—Two-sided p-value

—Mean / difference

—Confidence interval for the tested mean or mean difference.

How to use this T-Test Calculator

Run a one-sample or independent two-sample Welch t-test. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.