Confidence intervals, z-scores and distributions.
Free statistics tools: confidence interval, sample size, z-score, correlation, percentile, variance, standard error and normal, binomial and Poisson distributions. All 22 tools below are free, run entirely in your browser, and need no sign-up.
Free confidence interval calculator. Enter a sample mean, standard deviation and size to get the lower and upper bounds at 90, 95 or 99 percent.
Free sample size calculator for surveys. Enter your confidence level, margin of error and population to find how many responses you need.
Free margin of error calculator. Enter a sample proportion, sample size and confidence level to find the plus or minus error of your poll.
Free z-score calculator. Enter a value, mean and standard deviation to find how many standard deviations it sits from the average, with percentile.
Free p-value calculator from a z-score. Enter a z value and choose a one or two tailed test to get the exact p-value for hypothesis testing.
Free percentile calculator. Paste a data set and pick a percentile from 0 to 100 to find the value at that position using linear interpolation.
Free percentile rank calculator. Paste a data set and a value to find what percent of the numbers fall at or below it, from 0 to 100.
Free Pearson correlation coefficient calculator. Paste paired x and y data to find r, the strength and direction of a linear relationship.
Free covariance calculator. Paste paired x and y data to find the sample and population covariance measuring how two variables vary together.
Free standard error calculator. Paste a data set or enter a standard deviation and sample size to find the standard error of the mean.
Free variance calculator. Paste a data set to find the sample and population variance, plus standard deviation, mean and sum of squares.
Free coefficient of variation calculator. Paste a data set to find the CV, the standard deviation as a percent of the mean, for comparing spread.
Free five number summary calculator. Paste a data set to get the minimum, first quartile, median, third quartile and maximum at a glance.
Free interquartile range calculator. Paste a data set to find the IQR along with the first and third quartiles and the median in one step.
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.
Free geometric mean calculator. Paste positive numbers to find their geometric mean, the right average for growth rates, ratios and returns.
Free harmonic mean calculator. Paste positive numbers to find their harmonic mean, the correct average for rates like speed and price ratios.
Free weighted mean calculator. Enter values and their weights to find the weighted average, where more important items count for more.
Free normal distribution calculator. Enter a value, mean and standard deviation to find the probability density and cumulative probability.
Free binomial probability calculator. Enter trials, successes and success probability to find exact, at most and at least binomial probabilities.
Free Poisson probability calculator. Enter an average rate and a count to find exact, at most and at least Poisson probabilities for rare events.
Free relative frequency calculator. Paste category counts to build a frequency table with relative and cumulative frequencies as percentages.
Yes. Every statistics tool on yourhack.ai is completely free, with no sign-up and no usage limits.
Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.
Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.
There are currently 22 free statistics tools here, and we add more regularly.