Statistics calculators
25 free tools
Percentiles, z-scores, probability, and combinations — paste your numbers and get the answer with the formula shown, so you can check the working yourself.
Compute P(X=k) and cumulative P(X≤k) for n trials at probability p, along with the mean and variance.
Compute the coefficient of variation from a list, or a mean and std dev, as a percentage of the mean.
Build a 90%, 95%, or 99% confidence interval for a mean from the sample mean, standard deviation, and size.
Enter two matching lists of x and y values to get Pearson's r, from -1 to 1, measuring how they move together.
Find the sample and population covariance between two equal-length lists of paired values.
Find the expected value of a discrete distribution from paired value and probability lists.
Find the minimum, Q1, median, Q3, and maximum of a data set, plus the interquartile range.
Get the geometric mean of positive numbers, the right average for growth rates and compounding returns.
Calculate the harmonic mean of a list, the correct average for rates like speed and P/E ratios.
Paste your numbers to get the quartiles, median, IQR, and the fences that flag outliers.
Find the mean and the mean absolute deviation, the average distance of your values from the mean.
Get the mean, median, and mode of a data set at once, plus the count and range.
Find the midrange of a data set — the average of its smallest and largest values.
Find the z-score and the probabilities P(X<x) and P(X>x) for a value in a normal distribution.
Find outliers in a data set using the 1.5×IQR rule, with the lower and upper fences shown.
Drop in a list of numbers, pick a percentile, and see which value sits at that point in the data.
Give it n and r and get both nPr and nCr — the count when order matters, and when it doesn't.
Work out the odds of a single event, then combine two events for both, either, or neither.
Find the minimum, maximum, and range of a data set, along with the count.
Build a frequency table from a data list, showing each value's count, relative frequency, and cumulative frequency.
Find the survey sample size you need from population, confidence level, and margin of error.
Find the standard error of the mean from a list, or from a standard deviation and sample size.
Paste a list of numbers to get sample variance, population variance, and the mean.
Enter each value with its weight and get a mean that respects how much each one counts.
See how many standard deviations a value is from the mean, and recover the raw value from a z-score.
Frequently asked questions
Which statistics tool should I start with?
Depends on the question. For ranking a value against a group, reach for the Percentile or Z-Score calculator. For counting arrangements, use Permutations & Combinations. For spread, the Interquartile Range tool is a sturdy pick.
Do these show the formula, not just the answer?
Every tool lays out the math it used — the z-score formula, the nPr and nCr expansions, the 1.5×IQR fence rule — right on the page, so you can retrace each step instead of trusting a black box.
Can I paste a whole list of numbers at once?
Go ahead. The percentile and IQR tools take a list separated by commas, spaces, or new lines, filter out anything that isn't a number, and sort the rest for you before doing the math.