Average calculator (mean, median, mode)
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Add the numbers: sum = 90.
- Divide by how many there are: 90 ÷ 5 = 18.
- Sorted: 12, 15, 15, 20, 28; the middle value (median) is 15.
| Inputs | Answer |
|---|---|
| Numbers: 12, 15, 15, 20, 28 | The mean of 5 numbers is 18 and the median is 15. |
| Numbers: 1 2 3 4 | The mean of 4 numbers is 2.5 and the median is 2.5. |
| Numbers: 85, 90, 78, 92, 88, 90 | The mean of 6 numbers is 87.166667 and the median is 89. |
How to use it
The mean (average) is the sum of the numbers divided by how many there are. The median is the middle value of the sorted list (the average of the two middle values if the count is even). The mode is the value that appears most often, and the range is the largest value minus the smallest.
The calculator shows all of these, the count and the sum, and the working for your list. If no value repeats, there is no mode.
Frequently asked questions
How do I calculate an average?
Add all the numbers and divide by how many there are. For 12, 15, 15, 20, 28: 90 ÷ 5 = 18.
What is the difference between mean and median?
The mean uses every value, so one extreme value pulls it; the median is the middle value and resists extremes.
Can there be more than one mode?
Yes. If two values appear equally often, both are modes.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.