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Standard Deviation Calculator

Measure how spread out a set of numbers is.

Separate with commas, spaces, or new lines.

Standard deviation

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Variance

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Mean

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Coefficient of variation

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Count

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Min

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Max

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What Is Standard Deviation Calculator?

The Standard Deviation Calculator reports the population or sample standard deviation and variance of a list, with the mean, coefficient of variation, min, and max. Every step is shown, including why the divisor is n or n-1.

Who Uses the Standard Deviation Calculator?

Students use it for statistics assignments, and analysts use it to judge whether a measurement is consistent enough to trust a mean.

How to Use the Standard Deviation Calculator

  1. Enter your numbers.
  2. Choose population if the list is everything, sample if it is a subset.
  3. Read the standard deviation, variance, and coefficient of variation.

Why Choose Our Standard Deviation Calculator?

  • Population and sample modes side by side
  • Coefficient of variation for comparing spread
  • Full working including the divisor

Try the Standard Deviation Calculator above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.