Average of Any List of Numbers
This mean calculator works out the arithmetic mean — the value everyone calls the average — for any list of numbers. Paste your data once to get an instant result, a step-by-step sum-and-divide breakdown, and a full panel of related statistics, all computed right in your browser.
Who Uses It
Grades & Scores
Business Metrics
Lab & Research
How to Calculate the Mean
Enter Your Numbers
Type or paste your values into the input box, separated by commas, spaces, semicolons, tabs, or new lines. Integers and decimals both work, and a live count shows how many numbers were read.
Read the Result Instantly
The mean is recalculated automatically as you type — there is nothing to submit. Adjust the decimal precision to 2, 4, 6, or 8 places whenever you need more detail.
Show the Steps
Click Show Steps to reveal the full calculation — the sorted values, their sum, the count, and the final division — so you can see exactly how the average was reached.
Review the Summary
The Summary panel lists every related statistic from the same data — median, mode, standard deviation, variance, range, and quartiles — so you never need to switch tools.
The Mean Formula
| Data set | Sum (Σxᵢ) | Count (n) | Mean (x̄) |
|---|---|---|---|
5, 10, 15, 20, 25 | 75 | 5 | 15 |
3.5, 4.2, 5.1, 3.8 | 16.6 | 4 | 4.15 |
100, 200, 300 | 600 | 3 | 200 |
Features
Instant Calculation
The arithmetic mean updates live as you edit your data, with a running count of the numbers read.
Step-by-Step Solution
A clear breakdown shows the sorted values, the sum, the count, and the final division.
Flexible Input
Accepts numbers separated by commas, spaces, semicolons, tabs, or new lines.
Adjustable Precision
Round the result to 2, 4, 6, or 8 decimal places (4 by default).
Complete Summary
Median, mode, standard deviation, variance, range, and quartiles — all computed at once.
Private by Design
All math runs in your browser — your data never leaves your device.
Common Questions About the Mean
Is the mean the same as the average?
Yes. In everyday use, "average" almost always means the arithmetic mean — the sum of the values divided by how many there are. That is exactly what this calculator returns.
How do I calculate the mean by hand?
Add every value to get the sum, count how many values there are, then divide the sum by the count: x̄ = Σxᵢ / n. Turn on Show Steps to watch this play out with your own numbers.
What is the difference between the mean and the median?
The mean divides the total by the count, while the median is the middle value once the data is sorted. The median is far less affected by outliers, so it can be more representative for skewed data. Both appear in the Summary panel.
Does this calculate the weighted or geometric mean?
No — this tool computes the arithmetic mean, where every value counts equally. Weighted means (values with different importance) and geometric means (for growth rates and percentages) use different formulas and are not calculated here.
Why do outliers affect the mean so much?
Because every value feeds into the sum, a single very large or very small number can shift the mean noticeably. When your data has extreme outliers, the median is often the better summary of the typical value.
Can I use decimals, and how many decimal places are shown?
Yes. Both integers and decimals are accepted. You can round the result to 2, 4, 6, or 8 decimal places — it defaults to 4 — and whole-number results are shown without trailing zeros.
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