Enter a list of numbers and Mean Calculator will calculate the arithmetic mean, sum, count, range, median, and mode. You will also see the working, so the result is easy to check.
Use weights when one score or value should count more than another, such as exams, quizzes, assignments, or investment returns.
| Value | Weight | Action |
|---|---|---|
Paste your numbers into the box, choose how many decimal places you need, and select Calculate Mean. The result panel shows the average first, followed by the sum, count, minimum, maximum, range, median, and mode.
The calculation stays in your browser. Nothing is submitted when you press the button, so you can test another data set immediately.
The arithmetic mean is the value most people call the average. It is useful when one number needs to represent a complete list, such as test scores, weekly expenses, delivery times, temperatures, or sports results.
The mean shares the total equally across every value in the list. For example, if five days of spending add up to $150, the mean daily spending is $30. It does not mean you spent exactly $30 every day; it gives you one central value for the full period.
Arithmetic Mean = Sum of all values ÷ Number of valuesNumbers: 10, 20, 30, 40, 50
Sum: 10 + 20 + 30 + 40 + 50 = 150
Count: 5
Mean: 150 ÷ 5 = 30
Mean is the arithmetic average. Median is the middle value after sorting the numbers. Mode is the value that appears most often.
In the list 2, 4, 4, 6, 9, the mean is 5, the median is 4, and the mode is 4. A very high or very low outlier can pull the mean away from the rest of the data, which is why the median is sometimes more representative.
A simple mean treats every value equally. A weighted mean is better when some values matter more. A final exam worth 50% of a grade should influence the result more than a quiz worth 10%.
Weighted Mean = Sum of (value × weight) ÷ Sum of weightsYou can use this calculator for grades, household spending, work hours, fitness records, travel times, sales totals, temperatures, sports statistics, or any other list where an arithmetic average is useful.
85 + 90 + 78 + 92 + 88 = 433
433 ÷ 5 = 86.6
Mean score = 86.62.5 + 3.5 + 4.5 = 10.5
10.5 ÷ 3 = 3.5
Mean = 3.5-4 + -2 + 6 + 8 = 8
8 ÷ 4 = 2
Mean = 2The mean is the arithmetic average. Add all values and divide the result by the number of values.
In basic math, “average” usually refers to the arithmetic mean. In statistics, average can sometimes be used more broadly for different measures of central tendency.
Yes. The mean is negative when the sum of the values is negative.
Every appearance is included. In 5, 5, 10, both 5s are part of the sum and the count.
When no value repeats more often than the others, the result panel displays “No mode.”
Yes. Use the standard calculator for equally weighted scores and the weighted section when exams, quizzes, and assignments have different percentages.
Yes. Enter decimals and negative numbers in the same list as whole numbers.
An unusually high or low value can pull the mean away from most of the data. In that situation, compare it with the median.
