P-Value Calculator
p-value = 2 × (1 − Φ(|Z|)) where Φ is the standard normal CDF2×(1−Φ(1.96))≈2×0.025=0.05
Free online tool
P-Value Calculator
Enter a z-score to find the corresponding p-value.
Instant calculation
P-Value Calculator
Enter a z-score to find the corresponding p-value.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter z-score
Type the standardized test statistic.
- 02
Calculate
See the two-tailed p-value.
- 03
Interpret
p < 0.05 is commonly considered statistically significant.
The formula
How this calculation works
Area in both tails beyond the absolute z-score. Smaller p-values suggest statistical significance.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Z-score 1.96 — p-value?
2×(1−Φ(1.96))≈2×0.025=0.05≈ 0.05Common questions
Questions about this calculation
What is the P-Value Calculator?
The P-Value Calculator helps you convert a z-score to a two-tailed p-value for hypothesis testing. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Area in both tails beyond the absolute z-score. Smaller p-values suggest statistical significance.
Can you show an example?
Example: Z-score 1.96 — p-value? — ≈ 0.05.
Is my data saved when I use the P-Value Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the P-Value Calculator free to use?
Yes. The P-Value Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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