Formula Explanation
Standard deviation = sqrt(variance)
This calculator applies the formula Standard deviation = sqrt(variance). Enter each value with the matching unit, and AZCalculate updates the result instantly.
Mathematics
Standard Deviation Calculator
Use this standard deviation calculator to calculate calculate population variance and standard deviation for three values.
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Calculator
Calculate instantly
Calculator Inputs
Choose what you want to calculate, enter realistic values, adjust units where shown, and use the scenario section for repeated-use planning.
Input and Formula Breakdown
This calculator applies the formula Standard deviation = sqrt(variance). Enter each value with the matching unit, and AZCalculate updates the result instantly.
Value A
10
Value B
15
Value C
20
Variance
16.67
Standard deviation
4.08
Scenario and Comparison
Current
16.67
Projected
200
Adjusted
18.33
Visual Comparison
Current result16.67
Projected usage200
Comparison scenario18.33
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Use Cases
- Measure spread
- Analyze data
- Study statistics
Step-by-Step Explanation
- Step 1Enter the known values in the calculator fields.
- Step 2Keep the units consistent with the labels shown beside each input.
- Step 3Apply the formula: Standard deviation = sqrt(variance).
- Step 4Review the primary result and supporting values.
Example calculation
Example standard deviation calculator
Given
- Value A: 10
- Value B: 15
- Value C: 20
Steps
- Use the values shown above.
- Apply Standard deviation = sqrt(variance).
Result
The calculator above shows the computed answer instantly from these example values.
Calculator guide
About this Standard Deviation Calculator
Calculate population variance and standard deviation for three values. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.
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Calculator usage
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Live users now
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Total saved calculations
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Most active date
2026-06-05
FAQ
Standard Deviation Calculator FAQs
How does the standard deviation calculator work?+
It uses Standard deviation = sqrt(variance) and calculates the result from the values you enter.
Can I copy or print the result?+
Yes. AZCalculate calculator pages include copy, share, and print actions.
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