6 Best Free Online Chi-square Distribution Calculator Websites

Check out these best free online Chi-square distribution calculator websites. The Chi-square distribution is a special case of the gamma distribution. It is also known as also chi-square or χ2-distribution. Chi-square distribution is widely used in inferential statistics. This type of distribution is used in chi-square tests. It determines how close an observed distribution is to its theoretical distribution.

To calculate the chi-square distribution, you need to know the p-value and degree of freedom. This post covers 6 free websites where you can calculate chi-square distribution online. Some of these calculators calculate the probability density function and cumulative distribution functions for chi-square distribution. With that, it gets you the chi-square distribution or chi-value.

My Favorite Chi-square Calculator

Keisan.Casio.com is my favorite Chi-square Distribution Calculator website on this list. For a chi-square distribution, this calculator can calculate probability density, upper cumulative distribution, and lower cumulative distribution. It also shows the formula for each of these calculations. It lets you pick decimal digits for output and plots a graph of cumulative distribution functions.

You can check out our other lists of the best free online Paired T-test Calculator Websites, online Binomial Probability Calculator Websites, and online F-Distribution Calculator Websites.

Table of Content

Calculators	Chi-value	P-value	Plots Graph
Keisan Casio	✓	✓	✓
Stattrek	✓	✓	x
Uiowa.edu	✓	x	✓
AtoZ Math	✓	✓	x
Atlas.illinois.edu	✓	x	x
StatDistributions	✓	✓	✓

Keisan.Casio.com

Keisan.Casio.com has a free online Chi-square distribution Calculator. This calculator calculates the probability density function (f-value). Along with that, it also calculates the lower cumulative distribution function (p-value) and upper cumulative distribution function (q-value) of the distribution. You just have to add your inputs to the calculator and it gets you all these three values. By default, it calculates the values up to 22 decimal digits but you can set this length as per your needs. Apart from that, it also represents the lower and upper cumulative distribution functions using a graph.

How to calculate chi-square distribution online on Keisan.Casio.com?

• Go to this Chi-square distribution Calculator on Keisan.Casio using the link given below.
• Enter the percentile along with the degree of freedom into the calculator.
• Then click the Execute button to get the output.

Highlights:

• This calculator calculates Chi-square distribution from percentile and degree of freedom.
• It gets you the f-value, p-value, and q-value in the output.
• Option to set the number of decimal digits.
• Plots a graph of lower and upper cumulative distribution functions.

Stattrek.com

Stattrek.com is a free website with an online Chi-square Distribution Calculator. This is a simple calculator that calculates the Chi-square distribution from probability and the degree of freedom. With that, it gets you the Chi-square critical value which is the Chi-square distribution. Apart from that, there is a section below the calculator that defines all the terms used in the calculation to make it easy to understand.

How to calculate chi-square distribution online on Stattrek?

• Follow the link given below to open this calculator in your browser.
• Enter the probability along with the degree of freedom into the calculator.
• Then click the Calculate button to get the output.

Highlights:

• This calculator calculates Chi-square distribution from probability and degree of freedom.
• It also defines all the terms used in the calculation.

Divms.uiowa.edu

Divms.uiowa.edu offers a free online Chi-square Distribution calculator. This is the website of the University of Iowa. The Chi-square distribution calculator is quite simple here. It has three input data fields for v (Degrees of freedom), x (chi-square distribution), and P (Probability level). You can enter the values v and P into the calculator. This gets you the value of x along with a graph for the same.

How to calculate chi-square distribution online on Divms.uiowa.edu?

• Follow the link given below to open this Chi-square distribution calculator in your browser.
• Add the values of v and P into the calculator.
• As soon as you fill in the data, it gives you the x in the output.

Highlights:

• This calculator calculates Chi-square distribution from the probability and degree of freedom.
• It plots the distribution function graph as well.

AtoZMath.com

AtoZMath.com is another free website with a collection of online calculators. This also includes an online Chi-square Distribution calculator. This calculator calculates the chi-value from the p-value and the degree of freedom. It has input fields for both, the chi-value and p-value. You can fill in any of these values to get the other one. In other words, with a p-value, you can calculate the chi-value and vice versa. This calculator also generates a distribution table.

How to calculate chi-square distribution online on AtoZMath?

• Use the link mentioned below to open this calculator in your browser.
• Enter the Degree of freedom and p-value into the calculator.
• Then click the Find button to get the chi-value in the output.

Highlights:

• This calculator calculates the Chi-square distribution from the p-value and degree of freedom.
• It generates a table of cumulative distribution functions.

Atlas.illinois.edu

Atlas.illinois.edu is another website with an online P-Value Calculator for the Chi-Square Distribution Calculator. You can use this calculator to calculate the chi-value from the p-value and vice versa. You should also know the Degree of freedom for both these calculations. Apart from that, it also plots a distribution function graph of the calculation. You can just pick the p-value type (tail) and get the graph.

How to calculate chi-square distribution online on Atlas.illinois.edu?

• Follow the link mentioned below to open this calculator in your browser.
• Enter the Degree of freedom and p-value into the calculator.
• Then click the Compute Chi-square button to get the chi-value in the output.

Highlights:

• This calculator calculates the Chi-square distribution from the p-value and degree of freedom.
• It can also calculate the p-value when the chi-value is known.
• This calculator also plots the distribution function graph.

StatDistributions.com

StatDistributions.com has a free online Chi-square distribution calculator. This calculator has a minimal interface with three parameters and a distribution chart. The parameters are p-value, chi-value, and distribution function. You can get the chi-value either from the p-value or from the distribution function. In either case, you also get to pick the functional tail direction to plot a respective chart.

How to calculate chi-square distribution online on StatDistributions?

• Use the link mentioned below to open this calculator in your browser.
• Either enter the p-value or the test statistic. Pick the right or left tail.
• This gets you the Chi-square (x²) value as the output.

Highlights:

• This calculator calculates the Chi-square distribution from the p-value.
• It can also calculate the p-value when the chi-value is known.
• This calculator also plots the distribution function graph.