Free Standard Deviation CalculatorSD, SEM, mean and confidence interval for every column.

Paste one or more columns of numbers to get the sample standard deviation, standard error of the mean, mean with its 95% confidence interval, median, quartiles and more.
Graph the columns as bars, dots, box or violin plots with SD or SEM error bars.

SD and SEMMany columns at onceNo upload

No sign-up No upload No watermark

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Calculations run in your browser. Your data is not uploaded; the project is saved in this browser only.

THREE SIMPLE STEPS

How to use the Standard Deviation Calculator

Paste your numbers

One column per group; paste from a spreadsheet or type.

Read the statistics

n, mean, SD, SEM, 95% CI, median, quartiles, min, max, CV, geometric mean, skewness and kurtosis.

Copy or graph

Copy the table into your report, or draw the data with error bars.

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