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Statistics Tools

Confidence intervals, z-scores and distributions. 22 free tools, no sign-up.

Confidence Interval CalculatorEnter a sample mean, standard deviation and size to get the lower and upper bounds at 90, 95 or 99 percent.Sample Size CalculatorEnter your confidence level, margin of error and population to find how many responses you need.Margin of Error CalculatorEnter a sample proportion, sample size and confidence level to find the plus or minus error of your poll.Z-Score CalculatorEnter a value, mean and standard deviation to find how many standard deviations it sits from the average, with percentile.P-Value from Z-Score CalculatorEnter a z value and choose a one or two tailed test to get the exact p-value for hypothesis testing.Percentile CalculatorPaste a data set and pick a percentile from 0 to 100 to find the value at that position using linear interpolation.Percentile Rank CalculatorPaste a data set and a value to find what percent of the numbers fall at or below it, from 0 to 100.Correlation Coefficient CalculatorPaste paired x and y data to find r, the strength and direction of a linear relationship.Covariance CalculatorPaste paired x and y data to find the sample and population covariance measuring how two variables vary together.Standard Error of the Mean CalculatorPaste a data set or enter a standard deviation and sample size to find the standard error of the mean.Variance CalculatorPaste a data set to find the sample and population variance, plus standard deviation, mean and sum of squares.Coefficient of Variation CalculatorPaste a data set to find the CV, the standard deviation as a percent of the mean, for comparing spread.Five Number Summary CalculatorPaste a data set to get the minimum, first quartile, median, third quartile and maximum at a glance.Interquartile Range CalculatorPaste a data set to find the IQR along with the first and third quartiles and the median in one step.Outlier Detector (1.5 IQR)Free outlier detector using the 1.5 IQR rule. Paste a data set to find outliers, the fence boundaries and the clean values that remain.Geometric Mean CalculatorPaste positive numbers to find their geometric mean, the right average for growth rates, ratios and returns.Harmonic Mean CalculatorPaste positive numbers to find their harmonic mean, the correct average for rates like speed and price ratios.Weighted Mean CalculatorEnter values and their weights to find the weighted average, where more important items count for more.Normal Distribution CalculatorEnter a value, mean and standard deviation to find the probability density and cumulative probability.Binomial Probability CalculatorEnter trials, successes and success probability to find exact, at most and at least binomial probabilities.Poisson Probability CalculatorEnter an average rate and a count to find exact, at most and at least Poisson probabilities for rare events.Relative Frequency CalculatorPaste category counts to build a frequency table with relative and cumulative frequencies as percentages.

Free statistics tools: confidence interval, sample size, z-score, correlation, percentile, variance, standard error and normal, binomial and Poisson distributions. All 22 tools are free, run entirely in your browser, and need no sign-up.

Frequently asked questions

Are these statistics tools free?

Yes. Every statistics tool on yourhack.ai is completely free, with no sign-up and no usage limits.

Do these statistics tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

How many statistics tools are there?

There are currently 22 free statistics tools here, and we add more regularly.

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