About the T-Test Calculator
A one-sample, two-sample, and paired t-test calculator with p-values, in your browser.
What it is
The T-Test Calculator runs the three most common t-tests โ one-sample, two-sample independent (using Welch's unequal-variance formula), and paired โ returning the t-statistic, degrees of freedom, and two-tailed p-value. It's built for students and researchers who need a quick, transparent significance test.
Features
Three test types
One-sample, two-sample (Welch's), and paired t-tests in one tool.
Accurate p-values
Uses the regularized incomplete beta function for an accurate Student's t-distribution CDF.
Significance flag
Instantly see whether the result is significant at the common ฮฑ=0.05 threshold.
Step-by-step working
See the exact formula and substitution used to compute the t-statistic and degrees of freedom.