Q-Norm Calculator

Calculate the quantile of a normal distribution given probability, mean, and standard deviation.

Request Feature / Support

7,556+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

AI Web Tool Generator

Build Your Own Custom Web Calculator in Seconds

Type what tool or calculator you need below. Our AI will build it instantly for your site.

Informazioni su questo strumento

This qnorm calculator computes the quantile (inverse cumulative distribution function) of a normal distribution. Input a probability value (between 0 and 1), mean, and standard deviation to find the corresponding z-score or x-value. Supports left, right, and two-tailed calculations for statistical analysis and hypothesis testing. The tool uses precise mathematical algorithms to ensure accurate results for educational, research, and professional use.

Save your calculation history with a free account

Come usare

Enter a probability value between 0 and 1 in the 'Probability' field.
Enter the mean (default is 0 for standard normal).
Enter the standard deviation (default is 1 for standard normal).
Select the tail type: Left-tailed (probability in left tail), Right-tailed (probability in right tail), or Two-tailed (probability split between both tails).
Click 'Calculate Quantile' to compute the result.
View the quantile value, z-score, and explanation in the results section.

Frequently Asked Questions

Trova risposte rapide

What is a qnorm calculator?

A qnorm calculator computes the quantile (inverse cumulative distribution function) of a normal distribution. Given a probability, it returns the corresponding value on the distribution curve.

What is the difference between left-tailed and right-tailed?

Left-tailed calculates the quantile where the probability is in the left tail (e.g., probability = 0.05 gives a negative z-score). Right-tailed calculates where the probability is in the right tail (e.g., probability = 0.05 gives a positive z-score). Two-tailed splits the probability equally between both tails.

Can I use this for standard normal distribution?

Yes, by setting mean = 0 and standard deviation = 1, the calculator returns the z-score. For other normal distributions, adjust mean and standard deviation accordingly.

What if I get an error?

Ensure probability is between 0 and 1, standard deviation is positive, and all fields are filled. The tool will highlight invalid inputs and display specific error messages.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

Related Tools

Other useful calculators and utilities you might like

Convertitore Spotify a MP3

Converte file audio forniti localmente in MP3, consentendo l’ascolto offline e la compatibilità tra...

Calcolatore Distanza Stradale

Calcolatore di distanza stradale per viaggiatori, pianificatori logistici e conducenti per stimare r...

Calcolatore Età

Determina rapidamente l’età di una persona dal suo data di nascita con il nostro calcolatore gratuit...

Convertitore di valute

Converter rapidamente importi tra diverse valute con il nostro convertitore di valuta online gratuit...

Il tuo feedback è importante

Aiutaci a migliorare