🧪T-Test Calculator

Run one-sample, two-sample, or paired t-tests and get the test statistic, degrees of freedom, and p-value.

Sample mean

Hypothesized mean (μ₀)

Sample standard deviation

Sample size (n)

Free T-Test Calculator

Our free t-test calculator runs one-sample, two-sample independent (Welch's), and paired t-tests, returning the t-statistic, degrees of freedom, and two-tailed p-value instantly. Enter your sample statistics — mean, standard deviation, and sample size — and the test type handles the rest.

The one-sample test compares a sample mean against a hypothesized value. The two-sample test compares means from two independent groups using Welch's t-test, which doesn't assume equal variances. The paired test compares before-and-after measurements on the same subjects using the mean and standard deviation of the differences.

Every result shows the formula and substitution used to compute the t-statistic and p-value, so you can verify the calculation for coursework, research, or a quick significance check. No sign-up, no downloads — everything runs instantly in your browser.