Weighted Standard Deviation Calculator


The Weighted Standard Deviation Calculator is a powerful tool used in statistics to measure the amount of variation or dispersion in a dataset, considering the varying weights assigned to each value. It provides a more accurate representation of the variability present in the dataset.


The weighted standard deviation is calculated by first determining the weighted mean of the dataset using the provided weights, then computing the squared differences of each value from the weighted mean, summing these squared differences, dividing by the sum of the weights, and finally, taking the square root of the variance.

How to Use

  1. Input the values of the dataset (separated by commas).
  2. Enter the corresponding weights for each value (separated by commas).
  3. Click on the “Calculate” button to find the weighted standard deviation.


For example, given values: 10, 20, 30, and weights: 1, 2, 3, the calculator computes the weighted standard deviation for the dataset, considering the assigned weights for each value.


  1. Why use a weighted standard deviation?
    • It’s beneficial when certain data points have more significance or reliability than others in a dataset.
  2. Can this calculator handle negative values?
    • Yes, it accommodates positive and negative values in the dataset.
  3. What if I input non-numeric characters in the values or weights?
    • The calculator requires numeric inputs separated by commas for correct calculations.
  4. Is it necessary for weights to sum up to 1 or 100?
    • No, the weights just need to be relative to each other.
  5. How does it differ from a regular standard deviation?
    • It considers the impact of different weights on the values, offering a more nuanced view of variability.
  6. What if I have missing values or weights?
    • The calculator needs equal sets of values and weights for accurate computations.


The Weighted Standard Deviation Calculator is an invaluable tool in various fields such as finance, economics, and science, allowing users to calculate variability in datasets where certain data points hold different significance or importance.

This calculator simplifies the computation of the weighted standard deviation, offering users a more precise measure of variability, aiding in decision-making, risk analysis, and research across diverse domains.

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