Two-Tailed Area Under the Standard Normal Distribution Calculator

Use this free calculator to compute the two-tailed area under the standard (Bell) normal curve given a Z score  (two-tailed probability from a positive or negative Z score to infinity on both tails of the curve).

Please input a Z score in the required field and click CALCULATE.

*Note that this Two-Tailed Area Under the Standard Normal Distribution Calculator generates a positive value. For negative values just add a minus.