About the Average Calculator
Tezmy's Average Calculator gives you all the key statistics for a list of numbers at once. Paste numbers separated by commas, spaces or new lines (straight from a spreadsheet works too) and instantly see the mean (average), median, mode, range, sum, smallest and largest values, and both population and sample standard deviation. It's handy for grades, test scores, prices, sports stats and quick data checks.
Updated October 2026
How to use the Average Calculator
- 1Type or paste your numbers.
- 2Separate them with commas, spaces or new lines.
- 3Read the mean, median, mode and more instantly.
- 4Use sample standard deviation for data that's a sample of a bigger group.
Mean, median and mode explained
- Mean (average): add all the numbers and divide by how many there are. 4, 8 and 9 have a mean of 21 ÷ 3 = 7.
- Median: the middle number when they're sorted. It isn't pulled up or down by one very big or small value, so it's often fairer for salaries and house prices.
- Mode: the number that appears most often, useful for shoe sizes, survey answers and votes.
- Range: the biggest minus the smallest, a quick sense of how spread out the numbers are.
When to use the median instead of the mean
If one value is far from the rest, the mean can be misleading. Five salaries of 30,000 and one of 300,000 have a mean of 75,000, but a median of 30,000, which describes the typical person much better. Look at both to understand your data.
Standard deviation in plain words
Standard deviation shows how far numbers usually are from the mean. A small value means most numbers are close together; a large one means they're spread out. Use the population version when your list includes every value (all students in a class), and the sample version when it's a sample from a bigger group (a survey).
Paste straight from a spreadsheet
Copy a column from Excel or Google Sheets and paste it in: numbers separated by new lines, commas or spaces are all understood. Negative numbers and decimals work too, and results update as you type, so you can remove an odd value and see the difference instantly. Doing this for school marks? The Percentage Calculator turns the average into a percent, and the Online Calculator covers the quick sums.
Features
- Mean, median and mode
- Range, min, max and sum
- Population and sample standard deviation
- Paste from spreadsheets
- Handles negatives and decimals
- Instant results
Frequently asked questions
How do you calculate the average?
Add all the numbers and divide by how many there are. The average of 4, 8 and 12 is 24 ÷ 3 = 8.
What's the difference between mean and median?
The mean is the sum divided by the count. The median is the middle value when the numbers are sorted. The median isn't pulled around by a few very large or small values.
What is the mode?
The number that appears most often. A list can have more than one mode, or none if every number appears once.
Which standard deviation should I use?
Use population when your numbers are the whole group you care about. Use sample when they're a sample from a bigger group; it divides by n − 1 instead of n.
Can I paste numbers from Excel?
Yes. Copy a column or row and paste it in. Any separators work.
How do I calculate my average marks?
Paste or type all your marks separated by commas, like 78, 85, 92. The mean is your average mark. For grade point averages with credits, use the GPA Calculator.
Can there be more than one mode?
Yes. If two or more numbers appear equally often, and most often, they are all modes. If every number appears once, there is no mode.
What is a weighted average?
An average where some values count more than others, like courses with more credits. This calculator gives a simple average; for grades with credits, use the GPA Calculator.