P-Value Calculator
Calculate p-value using your data.
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What this tool does
Calculate p-value using your data. Two-sided z/t tests, right-sided chi-square. Degrees of freedom may be fractional for Welch t.
How to use the P-Value Calculator
- Enter or select distribution.
- Enter or select statistic.
- Enter or select degrees of freedom (t/chi-square).
- Read the calculated result; change any measurement to compare alternatives.
Formula
z/t report two-sided tail probability; chi-square reports right-tail probability
- distribution
- Distribution
- score
- Statistic
- df
- Degrees of freedom (t/chi-square)
Two-sided z/t tests, right-sided chi-square. Degrees of freedom may be fractional for Welch t.
Worked example
For p-value calculator, the following measurements illustrate the exact method: Distribution: z; Statistic: 1.96; Degrees of freedom (t/chi-square): 10.
Inputs
- DistributionStandard normal (z)
- Statistic1.96
- Degrees of freedom (t/chi-square)10
Result
- P-value0.05
Results explained
- P-value
- P-value from the formula above. Two-sided z/t tests, right-sided chi-square. Degrees of freedom may be fractional for Welch t.
Frequently asked questions
z/t report two-sided tail probability; chi-square reports right-tail probability
Two-sided z/t tests, right-sided chi-square. Degrees of freedom may be fractional for Welch t.
Enter numbers only, separated as described in the labels. Check sample units and remove missing values rather than substituting zero.
No. Statistical inference depends on sampling design, independence, model fit and interpretation; a p-value is not the probability that a hypothesis is true.
No. Calculations and numerical distribution algorithms run entirely in the browser.