Skip to content
Tools.Town
290+ free online tools

Standard Deviation Calculator

100% Free

Paste numbers to get sample or population standard deviation, variance, and mean.

100% Secure
No Sign Up
Client-Side
Be the first to rate

Statistics

Standard deviation
2.13809
Variance4.571429
Mean5
Count8
Min / Max2 / 9

Embed This Tool

Easy to Embed

Add Standard Deviation Calculator to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/standard-deviation-calculator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Standard Deviation Calculator">
</iframe>

Share This Tool

Share Instantly

Share Standard Deviation Calculator with anyone — no login required.

  • Shareable link
  • No login required
  • Works on any device
  • No account needed

Share via

Advertisement

How to Use

  1. 1 Choose sample or population mode
  2. 2 Paste numbers separated by commas or spaces
  3. 3 Read stddev, variance, and mean

Features

  • Sample (n−1) and population (n)
  • Variance + mean
  • Min/max
  • Client-side

Why it Matters

Analysts need dispersion next to mean/median without opening Excel.

★★★★★

Compute sample or population standard deviation from a pasted number list.

Frequently Asked Questions

Sample vs population?
Use sample (n−1) for a subset; population (n) when you have every value.
Need at least two numbers?
Yes — stddev is undefined for a single value.
Related tools?
Pair with Mean Median Mode for central tendency.
📖

Want to understand the math?

Browse all guides →
Compute Sample Std Dev for a D
standard deviation

Compute Sample Std Dev for a Dataset

Paste a numeric sample and get standard deviation and variance with n−1.

16 Aug 2026

5 min read

Related Tools You Might Like

Mean, Median & Mode Calculator

Paste a list of numbers — get mean, median, mode, range, min, max, and count.

Sample Size Calculator

Estimate survey sample size from confidence level, margin of error, and optional population size.

Percentage Calculator

Calculate X% of a number, find what percent X is of Y, or compute percentage change — instantly.

BMI Calculator

Calculate your Body Mass Index and find your healthy weight range — metric and imperial.

BMR Calculator

Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle — plus TDEE at every activity level.

Browse more free tools
More Calculators All categories