Standard Deviation Calculator

= 42 GoCalc

Calculate standard deviation, mean, variance, median, and range from a set of numbers.Updated 2026-03-20

Frequently Asked Questions

What is standard deviation?

It measures how spread out numbers are from the mean. Low SD means data is close to the mean.

Population vs Sample SD?

Population SD uses N, Sample SD uses N-1. Use Sample for a subset of data.

Is this free?

Yes, completely free with no signup.

How to Use

  1. Fill in the required values above
  2. Save or print the results
  3. Review the step-by-step explanation
  4. Adjust optional parameters for precision

FAQ

Does it show the work?

Yes, step-by-step breakdowns are provided so you can follow the calculation logic.

Are results suitable for professional use?

Provides accurate results based on standard formulas. For critical decisions, consult a professional.

Can I compare different scenarios?

Adjust the inputs and recalculate to compare different scenarios side by side.

How is the result calculated?

Uses standard mathematical formulas widely accepted in the field. The formula is shown with each result.

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