Average & Statistics Calculator

Paste a list of numbers to instantly get the mean, median, mode, range, sum and standard deviation.

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How to use the Statistics

Fill in each input field with your own numbers.
Results calculate automatically and update as you change any value.
Read the result cards below the inputs for the full breakdown.
Adjust any field to explore different scenarios instantly.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Statistics

Mean, median and mode

The mean is the arithmetic average (sum ÷ count), the median is the middle value when sorted, and the mode is the most frequent value. Together they describe the 'centre' of your data in different ways.

Range and standard deviation

The range is the gap between the largest and smallest values, while the standard deviation measures how spread out the numbers are around the mean.

How to use it

Enter numbers separated by commas or spaces. The calculator ignores anything that is not a number, so you can paste messy data.

Frequently asked questions

What is the difference between mean and median?

The mean averages every value; the median is the middle value, which is less affected by extreme outliers.

Which standard deviation does it use?

The population standard deviation (dividing by N). For a sample you would divide by N−1.

Can I paste data from a spreadsheet?

Yes — comma, space or newline separated values all work.

Understanding Statistics in depth

What this calculator gives you

Paste a list of numbers and this tool reports the core descriptive statistics in one go: the count, sum, mean (average), median, mode, range and standard deviation. Together these describe both the centre of your data and how spread out it is — the foundation of any data analysis.

Mean, median and mode — three kinds of 'average'

These measure the centre in different ways. The mean is the arithmetic average: add everything and divide by the count. The median is the middle value when the numbers are sorted, which is more robust to outliers. The mode is the value that appears most often. When data is skewed — incomes, house prices — the median often tells a truer story than the mean.

Range and standard deviation — measuring spread

The range is simply the largest value minus the smallest, a quick sense of spread. The standard deviation is more sophisticated: it measures the typical distance of values from the mean. A small standard deviation means the data clusters tightly around the average; a large one means it is widely scattered.

Population versus sample

There are two standard-deviation formulas. This tool uses the population version (dividing by N), appropriate when your list is the entire dataset. If your numbers are a sample drawn from a larger population, statisticians divide by N−1 (the 'sample' standard deviation) to correct for bias. For most quick analyses the difference is small, but it matters for formal statistics.

Everyday uses

Summarise test scores, survey responses, sensor readings or sales figures; spot outliers; and compare datasets. You can paste values separated by commas, spaces or newlines — even straight from a spreadsheet column — and anything that is not a number is ignored. Everything runs locally in your browser.