Two Tailed P Value Calculator


The Two-Tailed P Value Calculator is a valuable tool for researchers and statisticians engaged in hypothesis testing. It facilitates the calculation of the p-value, a crucial metric in determining the significance of observed differences in sample data.


The calculation of the two-tailed p-value involves comparing the observed value to the sample mean while considering the sample size. The result helps assess the probability of obtaining a value as extreme as the observed one, assuming the null hypothesis is true.

How to Use

  1. Enter the observed value from your sample.
  2. Input the sample mean.
  3. Specify the sample size.
  4. Click the ‘Calculate’ button to obtain the two-tailed p-value.


Consider a scenario where the observed value is 10, the sample mean is 8, and the sample size is 50. Enter these values, click ‘Calculate,’ and the result will provide the corresponding two-tailed p-value.


  1. What does the p-value signify?
    • The p-value represents the probability of obtaining results as extreme as the observed value, assuming the null hypothesis is true.
  2. Why is it called a two-tailed p-value?
    • A two-tailed p-value assesses the probability of extreme values in both tails of the distribution.
  3. Is a lower p-value always better?
    • A lower p-value (typically less than 0.05) suggests stronger evidence against the null hypothesis, indicating statistical significance.
  4. Can this calculator be used for one-tailed tests?
    • No, this calculator is specifically designed for two-tailed p-values.


The Two-Tailed P Value Calculator streamlines the process of determining the p-value, aiding researchers in making informed decisions about the significance of their findings. Understanding p-values is crucial in drawing valid conclusions from statistical analyses and hypothesis testing.

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