Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Chi-Square Test Calculator

Compute the chi-square (χ²) statistic from observed and expected frequencies to test goodness of fit or independence. Use it whenever you need to determine whether categorical data match a theoretical distribution.

Observed Frequency 1

Expected Frequency 1

Observed Frequency 2

Expected Frequency 2

Fill in the required fields to see your result.

Statistics

One-Sample T-Test Calculator

Compute the one-sample t-statistic to test whether your sample mean differs significantly from a known or hypothesised population mean. The first inferential test most students learn — used in survey analysis, quality control, and any single-group comparison against a benchmark.

Sample Mean

Population Mean (H₀)

Sample Standard Deviation

Sample Size

Fill in the required fields to see your result.

Key differences

	Chi-Square Test Calculator	One-Sample T-Test Calculator
Category	Statistics	Statistics
Inputs required	4	4
Result	Chi-Square Statistic	T-Statistic
What it does	Compute the chi-square (χ²) statistic from observed and expected frequencies to test goodness of fit or independence. Use it whenever you need to determine whether categorical data match a theoretical distribution.	Compute the one-sample t-statistic to test whether your sample mean differs significantly from a known or hypothesised population mean. The first inferential test most students learn — used in survey analysis, quality control, and any single-group comparison against a benchmark.