# P Value Calculator

> Convert a z-score to a p-value for a one-tailed or two-tailed test, with the area on each side of the curve.

**URL:** https://www.calculatoranswers.com/p-value-calculator
**Category:** Education

## Quick Answer

Find the p-value for your z-score. Enter a z-score, select a left-tailed, right-tailed or two-tailed test, and optionally set your significance level. This calculator uses the standard normal distribution and accepts z-scores only.

## Definition

A p-value calculator computes the probability of obtaining test results at least as extreme as the observed results, assuming the null hypothesis is true. This calculator maps a z-score to its probability using the standard normal distribution, and supports one-tailed and two-tailed tests depending on the directional hypothesis. It does not accept t-scores, chi-square values, or F-statistics, because each of those requires its own distribution and degrees of freedom. Researchers, data scientists, and students use a p-value during hypothesis testing to judge the statistical significance of a result.

## How to Use

1. **Input your z-score** — Type your calculated z-score into the input field. This calculator accepts z-scores only — entering a t-score, chi-square value, or F-statistic will not produce a correct p-value.
2. **Choose the test type** — Select a one-tailed or two-tailed hypothesis test to define the area under the curve.
3. **Read the statistical significance** — View the calculated p-value together with the area to the left and to the right of your z-score under the standard normal curve.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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