Standard deviation calculator is a statistical measure of diversity or variability in a data set. A low standard deviation specifies that data points situated commonly by the mean or the average value. A high standard deviation specifies greater variability in data points or higher dispersion from the mean.

Standard deviation is the square root of the variance. It shows how much the values in the data set differ from the mean.

It is free online. It counts the standard deviation, variance, mean, sum, and confidence interval approximations for given numbers. Enter a data set up to 5000 data points, separated by spaces. There is an opportunity to copy and paste data from a text document.

Click Calculate to get standard deviation, variance, count of data points, mean and the sum of squares.

The most angry I ever got at an exam during GCSE’s was probably non-calculator Maths where they wanted me to do standard deviation without a calculator. I mean, I could but it was just fucking rude to ask in the first place when I had revised vectors

— . (@judeinlondon2) June 4, 2018

fastest way to find n, sum of x, sum of x-square, sample standard deviation etc by using calculator casio 570MS 🙌 🙌 pic.twitter.com/qIKcKHTTK6

— Fatin (@ftnnssr) March 29, 2016

failed a quiz because the standard deviation was named different on a calculator.

— 幸福 (@TekTristan) October 16, 2018

I’ll never understand why some things are taught in school. Like I have no need to know how to calculate standard deviation when there’s an online calculator that can do it for I’m in seconds.

— Michael Ferguson (@mferg0722) January 17, 2019

Imagine spending seven hours a day revising how to do standard deviation without a calculator only to never fucking use it again after the exam

— . (@judeinlondon2) March 31, 2018

I'm expecting a calculator battle to happen tomorrow "my standard deviation is bigger bitch"

— joge (@simplewee_flow) January 21, 2016

You could use a similar pass-the-calculator procedure to determine standard deviation. Person 1 enters his or her squared deviation from the mean plus a random add-on. Yada yada yada. Person 1 subtracts X from the total squared deviations, divides by 10, and take square root. SD!

— John Daws (@grajillas) February 1, 2019

for example right now I am looking for the standard deviation, but my calculator died and i’m too lazy to go to the store and buy new batteries. in conclusion I am lazy.

— karyme! (@karymehernandz) January 26, 2019

I can’t stop thinking about how I’m a senior engineering student and got in trouble for using my calculator to find standard deviation the other day. NOBODY IN THE REAL WORLD DOES IT BY HAND ITS JUST NOT PRACTICAL

— Bailey Washer (@baileywasher) October 19, 2018