Example 1: Two-tailed t-test, t = 2.0, df = 10
Test Statistic: 2; Degrees of Freedom (for t-tests and chi-squared tests): 10; Type of Test: Two-tailed
P-value: 0.05
P-value Calculator
Statistics0.0(0)
Calculates the probability of observing a test statistic as extreme as, or more extreme than, the one calculated, assuming the null hypothesis is true.
More tools:Math & Statistics Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Test Statistic, Degrees of Freedom (for t-tests and chi-squared tests), and Type of Test in the units shown.
Step 2
Read P-value in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Example 2: One-tailed (right) t-test, t = 1.5, df = 20
Test Statistic: 1.5; Degrees of Freedom (for t-tests and chi-squared tests): 20; Type of Test: One-tailed (right)
P-value: 0.025
Example 3: One-tailed (left) t-test, t = -2.5, df = 15
Test Statistic: -2.5; Degrees of Freedom (for t-tests and chi-squared tests): 15; Type of Test: One-tailed (left)
P-value: 0.025
Explore the topic
Explore More Math & Statistics Calculators
Use calculators for algebra, geometry, trigonometry, probability, statistics, averages, z-scores, tests, and graphing tasks.
People Also Calculate
Related Calculators
Continue with another tool on a related topic.
Statistics
T-Test Calculator
Performs a t-test (one-sample, two-sample, or paired) to compare means and determine statistical significance.
1,304 viewsOpen calculator
Statistics
Inverse Normal Distribution Calculator
Finds the Z-score corresponding to a given cumulative probability (percentile) on a normal distribution.
1,239 viewsOpen calculator
Statistics
Chi-Square Calculator
Calculates the Chi-Square statistic and p-value for goodness-of-fit or test of independence. It requires observed and expected frequencies or values.
1,171 viewsOpen calculator
Statistics
Outlier Calculator
Identifies potential outliers in a dataset using the IQR * 1.5 rule (calculating fences).
1,130 viewsOpen calculator