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Average Calculator

Free average calculator: find the mean, median, or mode of a list of numbers. Enter values separated by commas and get instant results.

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Deep dive guides

A LITTLE CONTEXT · 4 MIN READMean vs Median vs Mode: How Averages Work
All 8 related guides
  • Mean vs Median vs Mode: How Averages Work — The three kinds of average, what each one hides, and how to choose: outliers drag the mean, the median resists, and the mode is for categories.
  • How Standard Deviation Works — What standard deviation actually measures, the step-by-step variance recipe, why sample mode divides by n−1, and the 68-95-99.7 bell-curve rule.
  • Z-Scores Explained: Standardising the Unusual — What a z-score really measures, how it becomes a percentile on the normal curve, and when the reading breaks down.
  • How Weighted Averages Work — Why some numbers count more than others: the weighted average formula, weights that don't sum to 1, and the grade and group-size traps.
  • How Percentile Rank Works — Position, not points: the counting formula behind percentile ranks and the below / at-or-below / midpoint conventions that ties create.
  • The 68-95-99.7 Rule Explained — The empirical rule: why bell-shaped data puts 68%, 95% and 99.7% within one, two and three standard deviations of the mean.
  • Geometric Mean vs Arithmetic Mean — One average adds, one multiplies: the geometric mean formula, volatility drag on returns, the AM–GM inequality, and when each is correct.
  • Grade Curving: Flat, Linear and Top-Score Methods — The three standard ways to curve a set of scores, what each does to the class distribution, and how to defend the choice.

How average calculator works

This calculator computes three common measures of central tendency. The mean is the sum of all values divided by the count. The median is the middle value when the numbers are sorted; if there is an even count, it is the average of the two middle values. The mode is the most frequently occurring value.

Enter your numbers separated by commas (for example: 2, 4, 4, 6, 8). Select which measure you want. For the mode, if all values appear equally often, the calculator reports no mode. If multiple values tie for most frequent, all are returned.

All calculation happens in your browser. The input is parsed as numbers, so you can use decimals and negative values.

Frequently asked questions

What is the difference between mean, median, and mode?
The mean is the arithmetic average (sum divided by count). The median is the middle value when sorted. The mode is the most frequently occurring value. They can give different results for the same data set.
How is the median calculated with an even number of values?
When there is an even count, the median is the average of the two middle values. For example, the median of 1, 3, 5, 7 is (3 + 5) / 2 = 4.
What if there is no mode?
If every value in the set appears the same number of times (all unique, for instance), there is no mode. The calculator reports this rather than returning a value.
Can I use decimals and negative numbers?
Yes. The calculator accepts any numeric values, including decimals and negatives. Enter them separated by commas.

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