Standard Deviation Calculator

Enter Data Set

Uncheck for population data (n denominator)
Data points: 5
Standard Deviation
4.74
Sample (s)
Variance
22.50
Mean
18.00
Minimum
12
Maximum
24
Range
12
68-95-99.7 Rule (Empirical Rule)
68%
within 1σ
13.3 - 22.7
95%
within 2σ
8.5 - 27.5
99.7%
within 3σ
3.8 - 32.2

Standard Deviation Calculator Guide

Measure standard deviation, variance, and related statistics for your datasets with BitBotBoo's free standard deviation calculator, offering clear results for homework, quality control, research, and everyday data analysis tasks.

How it works
  1. Enter your dataset (comma or space separated).
  2. Choose population or sample deviation if offered.
  3. Calculate standard deviation and variance.
  4. Review related summary stats.
Key features/options
  • Std dev & varianceSpread around the mean.
  • Sample vs populationn vs n−1 denominator when applicable.
  • Related statsMean and count often shown.
  • Fast analysisNo spreadsheet required.
Common uses
  • Statistics coursework.
  • Quality control batches.
  • Research data summaries.
  • Finance volatility sketches.
Privacy & features
  • Dataset not stored.
  • Free.
  • Population and sample modes.
FAQ

Population vs sample?

Use population when you have all values; sample when data is a subset.

High std dev?

Values are more spread out from the mean.

Saved?

No.