How do I calculate the mean of a list of numbers?

Add all the numbers together to get the sum, then divide by the count of numbers. The Average Calculator does this automatically and also shows the median, mode and range.

What is the difference between mean, median and mode?

The mean is the arithmetic average, the median is the middle value when the data is sorted, and the mode is the value that appears most often. Each summarises a data set in a different way.

When should I use the median instead of the mean?

Use the median when the data is skewed or contains outliers — for example house prices or salaries — because a few extreme values can distort the mean while the median stays representative.

What happens if my data has no repeated values?

Then there is no mode and the calculator reports none. If several values tie for the highest frequency, all of them are shown as modes.

What number separators can I use?

You can separate numbers with commas, spaces or new lines, so you can paste a column straight from a spreadsheet. Any non-numeric text is ignored automatically.

平均值计算器 2026 — 平均数、中位数、众数与极差

关于平均值计算器

The 平均值计算器 computes every common measure of a data set at once: the mean, median, mode and range, plus the sum, count, minimum, maximum and standard deviation. Paste numbers separated by commas, spaces or new lines and press Calculate Averages to see the results — perfect for grades, test scores, expenses, survey data and statistics homework.

平均数、中位数和众数详解

Mean — 算术平均数：把所有数值相加，再除以其个数。
Median — 数字排序后处于中间的值（个数为偶数时取中间两个值的平均）。
Mode — 出现次数最多的值（或多个值）。一组数据可以有一个众数、多个或没有。
Range — 最大值与最小值之差。

对于数据 12, 7, 9, 15, 7, 10，平均数为 10，中位数为 9.5，众数为 7，极差为 8。

何时用平均数、何时用中位数

mean最适合没有极端值的对称数据。当数据有偏或含异常值时，median更具代表性——例如平均房价或工资，少数极高的数值会把平均数往上拉。同时给出两者能呈现更完整的情况。

标准差

标准差衡量数字围绕平均数的离散程度。σ 小表示数值集中在平均值附近；σ 大表示分布很分散。此计算器给出总体标准差。

常见问题

How do I calculate the mean? 把所有数字相加，再除以数字的个数。

What if there is no repeating value? 那么该数据集没有众数，计算器会显示“无”。

What separators can I use? 逗号、空格和换行都可以，因此你可以直接从电子表格粘贴一列。

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重要提示： 本工具仅提供估算，不能替代专业建议。这些计算器生成的信息可能不完整，未能涵盖所有个人情况。在根据计算结果采取行动之前，请务必咨询经认证的专业人士（如财务顾问、医疗服务提供者或持牌工程师）。

📊 平均值计算器

关于平均值计算器

平均数、中位数和众数详解

何时用平均数、何时用中位数

标准差

常见问题

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