Average Calculator

Step 1: Enter your numbers in the text field, separated by commas or spaces. For example: 85, 90, 78, 92, 88.

Step 2: Click Calculate. The result shows the arithmetic mean (average). The breakdown includes the sum, count, median, minimum, and maximum values.

The average (arithmetic mean) is the most common measure of central tendency — a single number that represents the "center" of a data set. You calculate it by adding all values and dividing by the count. It answers "what is the typical value?"

Mean vs Median: The mean is the sum divided by count. The median is the middle value when numbers are sorted. For the set [1, 2, 3, 4, 100], the mean is 22 but the median is 3. The median better represents the typical value when extreme outliers exist. This calculator shows both.

When to use the mean: Grades, test scores, temperatures, athletic stats, financial returns — any data set without extreme outliers. The mean works best when values are roughly symmetrically distributed.

When the median is better: Income data, home prices, and any data with extreme outliers. The average US household income is skewed upward by very high earners, making the median a more useful "typical" figure.

Min and Max define the range of your data. Range = Max − Min. A wide range with a small data set suggests high variability.

Mean = Sum of All Values ÷ Count of Values

Mean = (x₁ + x₂ + x₃ + ... + xₙ) / n

Median: Sort the values from smallest to largest. If the count is odd, the median is the middle value. If even, the median is the average of the two middle values.

Example: Values: 85, 90, 78, 92, 88
- Sum = 85 + 90 + 78 + 92 + 88 = 433
- Count = 5
- Mean = 433 / 5 = 86.6
- Sorted: 78, 85, 88, 90, 92
- Median = 88 (the middle value)
- Min = 78, Max = 92

Example 1: Test Score Average
Scores: 85, 90, 78, 92, 88. Enter "85, 90, 78, 92, 88". Mean: 86.6. Median: 88. Your typical performance is in the B+ range.

Example 2: Finding Outliers
Data: 12, 15, 14, 13, 95. Enter the numbers. Mean: 29.8, Median: 14. The huge gap between mean and median reveals that 95 is an outlier pulling the average up.

Example 3: Monthly Expenses
Monthly rent over 6 months: 1200, 1200, 1250, 1200, 1300, 1200. Mean: $1,225. Median: $1,200. The occasional higher month slightly raises the average.

Compare mean and median. When they are close, your data is fairly symmetric. When the mean is much higher than the median, you have right-skewed data with high outliers. When much lower, left-skewed with low outliers.

Separate by commas or spaces. The calculator accepts both: "85, 90, 78" and "85 90 78" work identically.

Remove obvious errors before averaging. A typo like 850 instead of 85 will significantly skew the mean. Check your data for unreasonable values before calculating.

Use the median for prices and income. When comparing home prices, salaries, or costs, the median is usually more representative because a few very high values can inflate the mean.

The count matters. An average of 2 values is much less reliable than an average of 200. More data points give a more stable and meaningful average.