Find Student’s t critical values, confidence intervals, and significance levels using an interactive calculator and complete t-distribution reference table.
Student's t-Table Calculator with t Distribution Curve
Student's t Distribution
At 24 degrees of freedom, the t distribution has slightly heavier tails than the standard normal distribution.
Find a Critical t-Value
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What Is a t-Statistic?
A t-statistic measures how far a sample estimate is from a hypothesized value in units of estimated standard error.
- x-bar = sample mean
- mu = hypothesized population mean
- s = sample standard deviation
- n = sample size
Common Critical t-Values
Positive critical values for two-sided confidence intervals.
| df | 90% | 95% | 99% |
|---|
Critical Values of Student's t Distribution
Use the row for degrees of freedom and the column for the required alpha.
Values are rounded to three decimal places. The Infinity row shows the standard normal limiting values.
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Published: August 27, 2026
Last Updated: September 6, 2026
