What are mean, median, and standard deviation?
Statistics like mean, median, and standard deviation summarize a set of numbers — test scores, survey results, sales figures — to reveal the overall trend and how spread out the data is. Just paste your numbers in and this tool calculates all of them at once.
How to use it
① Paste your numbers
Paste numbers separated by commas, spaces, newlines, or semicolons. You can copy a column straight from Excel or a spreadsheet and paste it directly.
② Check the basic statistics
Count, sum, min, and max are shown along with the mean, median, mode, standard deviation, and variance, all calculated automatically. Click the ? next to any stat for an explanation.
③ See the distribution with quartiles and a histogram
Q1, Q2 (median), Q3, and the IQR (interquartile range) are shown alongside a histogram visualizing the shape of the distribution.
What makes this tool different
- Accepts comma, space, newline, or semicolon separators — paste straight from a spreadsheet
- Calculates mean, median, mode, standard deviation, variance, quartiles, and IQR at once
- Visualizes the frequency distribution as a histogram
- A ? button next to every stat explains what it means
- Completely free, no sign-up, no ads
Frequently asked questions
Should I look at the mean or the median?
The mean is the sum divided by the count, so it's sensitive to outliers (extremely large or small values). The median is the middle value when sorted, so it's more resistant to outliers — a good representative value for skewed data like income. Comparing both can also tell you whether your data is skewed.
What's the difference between standard deviation and variance?
Standard deviation is expressed in the same unit as the original data, making it intuitive to interpret. Variance is the standard deviation squared, so its unit is squared too — it's mainly used in further calculations. If you want a direct sense of how spread out the data is, look at the standard deviation.
What separators are supported?
Commas, spaces, newlines, or semicolons. Data pasted as a single column (newline-separated) is also recognized without issue.
Is it free?
Yes, completely free with no sign-up, unlimited use.