Tool 502 · Statistical inference
T‑Test Calculator
Run one-sample, Welch, pooled independent, and paired t-tests from raw data or summary statistics. Get the test statistic, exact t-distribution p-value, confidence interval, standardized effect, descriptive diagnostics, and a copy-ready research report.
Raw or summaryPaste spreadsheet values or enter n, mean and SD.
Welch-firstUnequal-variance comparison is the default for independent groups.
Effect + intervalNot just “significant / not significant.”
Local onlyYour research data never leaves this browser.
Compare one sample with a reference value
Tests whether the population mean differs from a hypothetical mean.
Sample values
Paste numbers separated by spaces, commas, semicolons, tabs or lines. Non-numeric tokens are ignored and reported.Independent groups
Paired observations
One pair per row: A, B. The tested difference is A − B. Rows without two valid numbers are skipped and reported.One-sample summary
Independent-group summaries
Paired-difference summary
Hypothesis & analysis settings
Comma-decimal mode expects values separated by spaces, semicolons, tabs or new lines.