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Standard Deviation Calculator

Calculate standard deviation and variance.

Standard Deviation Calculator
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What Is Standard Deviation Calculator?

Easily calculate the standard deviation, variance, and mean of a dataset. This free online tool gives you instant, accurate results without any sign-up or installation required.

How to Use This Calculator

  1. Enter your values in the fields above.
  2. Results update instantly in real time.
  3. Copy or note your result — no account needed.

Why Use CalculTool?

  • 100% Free — no subscriptions or hidden fees.
  • Privacy-first — all calculations run in your browser. Nothing is stored.
  • Mobile-friendly — works on any device, any screen size.