Measure how far your numbers spread out from their average. Paste a list of values and the tool returns both the sample variance and the population variance, along with the matching standard deviations, the mean, and the sum of squared deviations. Variance is the average of the squared distances from the mean, so it grows quickly when values are far apart and stays small when they cluster tightly. The sample version divides the sum of squares by n minus one, an adjustment called Bessel correction that removes bias when you are estimating from a sample, while the population version divides by n. Because variance is in squared units, most people take its square root to get the more readable standard deviation. It underpins nearly every statistical test. Everything is computed locally in your browser, so your data is never uploaded.
Variance measures how spread out a data set is, the average of the squared differences from the mean.
Sample variance divides by n minus 1 while population variance divides by n, and the tool shows both.
The standard deviation is the square root of the variance, returning the spread to the original units.
Measure how far your numbers spread out from their average. Paste a list of values and the tool returns both the sample variance and the population variance, along with the matching standard deviations, the mean, and the sum of squared deviations.
Yes. Variance Calculator is completely free, with no sign-up and no usage limits.
Yes. Variance Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Variance Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.