Free interactive student tool
Free T-Test Calculator
Free T-Test Calculator. One-sample, paired and independent modes using raw data or summary statistics.
Immediate resultNo sign-up requiredTransparent methodOptional email copy
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Your result
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Difference divided by standard error
How this tool reaches its result
A t statistic compares an observed mean difference with the standard error of that difference.
Difference divided by standard error
Worked context
How to interpret the output
Two independent groups with means 82 and 76 require the standard deviations and sample sizes before the test statistic can be calculated.
Important limitation
What the result cannot decide for you
Independence, influential outliers and the selected equal-variance or Welch method affect the result.