Skewness calculator
Paste a numeric sample. The calculator reports a finite-sample adjusted estimator.
How do I use this page?
- Paste the data.
- Check the mean and standard deviation.
- Read the result and interpret it with the distribution shape.
What this page does not do: At least three non-constant observations are required. Skewness reacts strongly to individual extreme values.
Further reading
Theory — what is skewness of a distribution?
Skewness measures the asymmetry of a data distribution. A positive value usually indicates a longer right tail, while a negative value indicates a longer left tail. The calculator uses the adjusted Fisher-Pearson estimator G1, corrected for finite sample size, and computes it once you paste in your numeric data. A value close to zero suggests approximate symmetry, but it does not mean the distribution is normal — the same value can occur for distributions with very different shapes.
Frequently asked questions
Does zero prove normality?
Do outliers affect the result?
See also
A/B test calculator
Compare two proportions in an A/B test. Calculate conversion rates, difference, uplift, z score, p value and c
A/B test planning — sample size, MDE and duration
Plan a two-proportion experiment, estimate detectable effect and traffic duration.
ACF and PACF autocorrelation calculator
Calculate ACF and PACF across time-series lags. Review the chart, reference bounds and coefficient table.