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Supporting Statistics Tools

Free Online Calculators

Find every calculator you need in one place. Our tools help you solve math and statistics problems quickly and accurately. Each calculator is simple to use and includes clear steps to help you understand how the results are computed. Whether you are learning a concept or checking your work, these calculators make problem-solving easier. Browse the full list below and choose the tool that fits your needs.

55 published tools in one calculator library

Use calculators after choosing the method

The learning guides explain when a procedure is appropriate, its assumptions, and how to interpret the result. Use these tools to perform or verify the calculation.

Basic math

Browse Basic math calculators and supporting statistical tools.

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Decimal to Fraction Calculator

Convert decimals into fractions instantly and returns simplifies results. Perfect for those who want to quickly convert any…

Decimal to Percent Calculator

Convert decimals to percentages quickly by multiplying by 100 and present the result in a format that is…

Fraction Calculator

Perform addition, subtraction, multiplication, and division of proper fractions and instantly returns simplified results.

Fraction to Decimal Calculator

Quickly converts proper fractions, or improper fractions into decimal. It is perfect for math homework, data work, and…

Improper Fraction Calculator

Add, subtract, multiply, or divide improper fractions and get a simplified result.

Improper Fraction to Mixed Number Calculator

Convert an improper fraction into a mixed number in seconds and also provide a clear, step-by-step explanation.

Mixed Fraction Calculator

Add, subtract, multiply, or divide mixed fractions and get the result in a clear step-by-step format for homework,…

Mixed Number to Improper Fraction Calculator

Convert a mixed number into an improper fraction quickly. Accurate for fraction operations, algebra work, and math problem…

Percent to Decimal Calculator

Convert percentages into decimal form instantly for use in math problems, statistics, finance, and everyday calculations.

Simplifying Fractions Calculator

Reduce fractions to their simplest form instantly by finding the greatest common factor and rewriting the fraction in…

Basic statistics

Browse Basic statistics calculators and supporting statistical tools.

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Arithmetic Mean Calculator

Find the arithmetic mean quickly by adding all values and dividing by the total number of observations.

Coefficient of Variation Calculator

Use this calculator to quickly find the sample coefficient of variation or population coefficient of variation using either…

Descriptive Statistics Calculator

Calculate key descriptive statistics such as mean, median, mode, range, variance, and standard deviation to summarize your dataset…

Five Number Summary Calculator

Generate the five number summary including minimum, first quartile, median, third quartile, and maximum for a quick overview…

Geometric Mean Calculator

Find the geometric mean quickly for growth rates, percentages, returns, and other multiplicative data.

Harmonic Mean Calculator

Calculate the harmonic mean for rates, ratios, and average speeds where reciprocal values give a more meaningful average.

Mean, Median, Mode Calculator

This Mean Median Mode Calculator helps you quickly find the three main measures of central tendency from a…

Population Mean Calculator

Calculate the population mean easily to find the true average value for an entire population dataset.

Population Standard Deviation Calculator

Calculate the population standard deviation to measure how far values in an entire population typically spread from the…

Quartile Calculator

Find quartiles quickly to divide your dataset into four equal parts. It helps you better understand spread, position,…

Range Calculator

Find the range instantly by subtracting the minimum value from the maximum value to measure overall data spread.

Sample Mean Calculator

Find the sample mean quickly from your dataset to measure the average value and summarize the center of…

Sample Standard Deviation Calculator

Calculate the sample standard deviation to estimate how much sample values vary around the sample mean.

Standard Deviation Calculator

Calculate sample and population standard deviation instantly to measure data spread and understand how much values differ from…

Standard Error Calculator

Calculate the standard error to estimate how much a sample mean is expected to vary from the true…

Variance Calculator

Compute variance quickly to measure how widely data values are spread around the mean in a sample or…

Weighted Mean Calculator

Compute the weighted mean when some values carry more importance or frequency than others in your dataset.

Hypothesis

Browse Hypothesis calculators and supporting statistical tools.

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All-in-One Critical Value Calculator

Calculate critical values for z, t, chi-square, F, and correlation tests in one place for faster hypothesis testing…

Chi-Square (χ²) Critical Value Calculator

Calculate the chi-square critical value from degrees of freedom and significance level for all chi-square tests

Correlation (r) Critical Value Calculator

Find the critical value of Pearson’s r using your sample size and significance level to test whether a…

F Critical Value Calculator

Find the F critical value using numerator and denominator degrees of freedom for one-tailed F tests such as…

F Statistic P Value Calculator

Find the p-value from an F statistic and degrees of freedom quickly for ANOVA, regression, and other F-based…

One Proportion Z-Test Calculator

Use this one-proportion z-test calculator to test whether a sample proportion is different from a hypothesized population proportion.…

P Value Calculator

Use this p value calculator to find a p-value from a z score, t statistic, chi-square statistic, F…

P Value From Chi-Square Calculator

Calculate the p-value from a chi-square statistic and degrees of freedom to assess significance in chi-square tests.

P Value From T Calculator

Find the p-value from a t statistic and degrees of freedom for one-tailed or two-tailed tests in seconds.

P Value From Z Calculator

Calculate the p-value from a z score quickly for one-tailed or two-tailed tests. Helps you interpret statistical significance…

P-Value from r Calculator

Calculate the p-value from a correlation coefficient and sample size to test whether Pearson’s r is statistically significant.

T Critical Value Calculator

Calculate the t critical value from your significance level and degrees of freedom for one-tailed or two-tailed hypothesis…

Z Critical Value Calculator

Find the z critical value quickly for one-tailed or two-tailed tests based on your chosen confidence level or…

Probability

Browse Probability calculators and supporting statistical tools.

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Area between Two Z-scores Calculator

Calculate the area between two z scores to find probability within a selected normal distribution range.

Area to the Left of Z Calculator

Find the area to the left of a z score to calculate lower-tail probability under the normal distribution.

Area to the Right of Z Calculator

Find the area to the right of a z score to calculate upper-tail probability under the normal distribution.

Binomial Distribution Calculator

Calculate binomial probabilities using the number of trials, probability of success, and selected number of outcomes.

Conditional Probability Calculator

Find conditional probability to measure the chance of one event occurring given that another event has happened.

Inverse Normal Distribution Calculator

Find the z score or cutoff value that matches a given probability or percentile in a normal distribution.

Percentile to Z Score Calculator

Convert a percentile into a z score to locate its position on the standard normal distribution.

Poisson Distribution Calculator

Calculate Poisson probabilities for rare events occurring over time, space, distance, or other fixed intervals.

Z Score Calculator

Calculate the z score of a value using the mean and standard deviation to measure distance from the…

Z Score Probability Calculator

Find the probability linked to a z score and interpret areas under the normal distribution quickly.

Sample Size

Browse Sample Size calculators and supporting statistical tools.

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Cochran’s Sample Size Calculator & Formula

Calculate sample size using Cochran’s formula for surveys and proportion studies based on confidence level, margin of error,…

Margin of Error Calculator (MOE Calculator)

This Margin of Error Calculator helps you quickly estimate how precise your survey or sample result is using…

Sample Size Calculator

Calculate the required sample size for surveys and research studies using key inputs such as confidence level, margin…

Slovin’s Formula Calculator

Use Slovin’s formula to estimate sample size quickly when population size is known and a desired margin of…

Yamane Sample Size Calculator & Formula

Calculate sample size with Yamane’s formula using population size and margin of error for simple survey and research…