How to use the two-sided p-value from z calculator
Convert a z statistic into a two-sided and one-sided p-value. Enter z statistic in the field above; the two-sided p-value, one-sided p-value are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “p value from z score”, “two sided p value”, “significance from z statistic”, “calculate two-sided p-value from z”, “find two-sided p-value”.
Formula
Variables
- z — Z statistic
Worked example
With z statistic = 2.1, the calculator gives two-sided p-value ≈ 3.572872 %; one-sided p-value ≈ 1.786436 %.
Frequently asked questions
What is the two-sided p-value from z calculator used for?
Convert a z statistic into a two-sided and one-sided p-value. It helps with questions such as “p value from z score”, “two sided p value”, “significance from z statistic”.
What is the formula for the two-sided p-value from z calculation?
Two-sided p-value (%) = 2 × (1-ncdf(abs(z))) × 100. One-sided p-value (%) = [Two-sided p-value] / 2. Here z is z statistic.
What inputs do I need for the two-sided p-value from z calculator?
You need z statistic. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the two-sided p-value from z calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the two-sided p-value from z result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.