Average Calculator
Separate with commas, spaces, or new lines.
Mean
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Median
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Mode
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Count
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Min
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Max
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Sum
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What is an Average Calculator?
An average calculator computes the key statistical measures for any set of numbers: mean, median, mode, minimum, maximum, and sum. Paste in a list and get a full picture of your data without needing a spreadsheet.
How It Works
Each measure is calculated differently:
Example
Test scores: 72, 85, 85, 91, 64
- Mean: 397 / 5 = 79.4
- Median (sorted: 64, 72, 85, 85, 91): 85
- Mode: 85 (appears twice)
Which Average Should You Use?
Mean, median, and mode each tell a different story about your data. Choosing the wrong one misrepresents what you're analyzing.
| Measure | Best when | Example |
|---|---|---|
| Mean | Data is normally distributed, no major outliers | Average test score in a class |
| Median | Data is skewed or has extreme outliers | Household income, home prices |
| Mode | Finding most common value or category | Most popular product size, most frequent response |
The Outlier Problem
A single extreme value can dramatically shift the mean while barely affecting the median. Consider six employees' salaries:
The mean of $176k vastly overstates what a typical person in this group earns. Median ($43,500) is the honest representation. This is exactly why median household income is a more useful economic indicator than mean income.
Tips
- Separate numbers with commas, spaces, or new lines. The calculator handles any mix.
- Use median instead of mean when your data has outliers. A single extreme value can skew the mean significantly.
- If all values appear equally often, there is no mode. The calculator displays "None" in that case.
Frequently Asked Questions
What is the difference between mean, median, and mode?
Mean is the arithmetic average: sum divided by count. Median is the middle value when all numbers are sorted. Mode is the value that appears most often. All three are measures of central tendency but behave differently with skewed or repeated data.
When should I use median instead of mean?
Use median when your data has outliers. Income is a classic example: a single very high earner in a dataset makes the mean look inflated even if most values are much lower. Median gives a more representative center.
Can there be more than one mode?
Yes. If two values appear equally often and more than any other, the dataset is bimodal and both are modes. If every value appears once, there is no mode.
How do I calculate a weighted average?
Multiply each value by its weight, sum all those products, then divide by the total weight. For grades: (quiz1 x 0.25) + (quiz2 x 0.25) + (final x 0.50). This calculator computes unweighted mean only.