Quick answer: The average most people mean is the arithmetic mean: add all values and divide by how many there are. This calculator also shows the median, the middle value when data is sorted, and the mode, the most frequent value. The mean is pulled by outliers, while the median stays steady, so check both.
Last reviewed: September 2026
Key facts
- Computes the mean (average), median (middle value), sum, count, min and max in one go.
- Accepts numbers separated by commas, spaces or new lines — paste straight from a spreadsheet.
- The mean is sensitive to outliers; the median shows the “typical” value when data is skewed.
- Mean = sum ÷ count. Median = the middle value of the sorted list.
An average turns a pile of numbers into one representative figure — test scores, monthly spending, race times. This free average calculator takes any list of numbers and instantly returns the mean, median, sum, count, minimum and maximum.
Type or paste your numbers separated by commas, spaces or line breaks. Everything recalculates live, and the median is included because it often tells a truer story than the mean.
How to use
- Type or paste your numbers, separated by commas, spaces or new lines.
- The mean (average) appears instantly at the top.
- Read the median, sum, count, min and max in the line below.
- Edit any number to see every statistic update live.
Mean and median formulas
| Term | Meaning |
|---|---|
| Σx | The sum of all the numbers. |
| n | How many numbers there are. |
| Median | Sort the numbers; take the middle one (or the average of the two middle ones). |
The median resists outliers: in [1, 2, 3, 4, 100] the mean is 22 but the median is 3 — the “typical” value.
Worked examples
Test scores
Scores 10, 20, 30, 40, 50: sum = 150, count = 5, mean = 150 ÷ 5 = 30.
Sorted, the middle value is also 30, so mean and median agree — the scores are symmetric.
Skewed data
House prices 4, 8, 15, 16, 23, 42 (in £10k): mean = 108 ÷ 6 = 18 (£180k).
Median = (15 + 16) ÷ 2 = 15.5 (£155k) — lower than the mean because the £420k outlier pulls the average up. Reporters usually quote the median for house prices for exactly this reason.
Mean vs median: which to use
| Situation | Better choice | Why |
|---|---|---|
| Test scores, temperatures | Mean | Data is symmetric; every value should count equally. |
| House prices, salaries | Median | A few huge values would distort the mean. |
| Finding a “typical” value | Median | It is the literal middle — half above, half below. |
| Total matters (e.g. rainfall) | Mean (via sum) | Sum = mean × count reconstructs the total. |
Frequently asked questions
What is the difference between mean and median?
The mean is the sum divided by the count; the median is the middle value when sorted. They match for symmetric data and differ when data is skewed.
How do I enter numbers?
Separate them with commas, spaces, semicolons or line breaks — e.g. “10, 20, 30” or one per line. Pasting from Excel works.
What is the mode?
The most frequent value. This calculator focuses on mean and median; if you need the mode, sort the list and look for repeats.
Can it handle decimals and negatives?
Yes — any real numbers, including negatives and decimals, in any order.
Why is the median of an even count a decimal?
With an even count there is no single middle value, so the median is defined as the average of the two middle values.
What if I enter text by accident?
Non-numeric entries are flagged — the calculator asks you to check the input rather than silently ignoring them.
Sources
- Khan Academy — Mean, median and mode explained
- Maths is Fun — Averages with worked examples
Key takeaways
Key takeaways
- Mean = sum ÷ count; median = middle of the sorted list.
- For skewed data (salaries, house prices), the median is the honest “typical” figure.
- Paste straight from spreadsheets using commas, spaces or line breaks.
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