Free Skewness Calculator

Estimate the skewness of a distribution using Pearson's approximation based on the mean, median, and standard deviation.

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Pearson Skewness Coefficient

1.5000

Mean - Median Difference5.0000

Pearson Skewness Coefficient vs Mean

View formula & how it works →

How to Estimate Skewness

Pearson's Second Coefficient of Skewness

Skewness = 3 * (Mean - Median) / Standard Deviation

  • Positive skewness: The right tail is longer; the mean exceeds the median.
  • Negative skewness: The left tail is longer; the mean is below the median.
  • Zero skewness: The distribution is symmetric.

    • This is an approximation. The exact moment-based skewness requires raw data.

    Example Calculation

    A dataset has mean 55, median 50, and SD 10. Estimate the skewness.

    1. 01Skewness = 3 * (55 - 50) / 10
    2. 02= 3 * 5 / 10
    3. 03= 15 / 10 = 1.5
    4. 04Positive value indicates right skew

    Frequently Asked Questions

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